Lint Python files with Yapf (#1872)

.style.yapf

@@ -42,7 +42,7 @@ blank_line_before_nested_class_or_def=False
 #        'key1': 'value1',
 #        'key2': 'value2',
 #    })
-coalesce_brackets=False
+coalesce_brackets=True
 
 # The column limit.
 column_limit=79
@@ -90,7 +90,7 @@ i18n_function_call=
 #       'key2': value1 +
 #               value2,
 #   }
-indent_dictionary_value=False
+indent_dictionary_value=True
 
 # The number of columns to use for indentation.
 indent_width=4
@@ -187,4 +187,3 @@ split_penalty_logical_operator=300
 
 # Use the Tab character for indentation.
 use_tabs=False
-

.travis.yml

@@ -38,10 +38,12 @@ matrix:
         - export PATH="$HOME/miniconda/bin:$PATH"
         - cd doc
         - pip install -q -r requirements-doc.txt
+        - pip install yapf
         - sphinx-build -W -b html -d _build/doctrees source _build/html
         - cd ..
         # Run Python linting.
         - flake8 --exclude=python/ray/core/src/common/flatbuffers_ep-prefix/,python/ray/core/generated/,src/common/format/,doc/source/conf.py,python/ray/cloudpickle/
+        - .travis/yapf.sh
 
     - os: linux
       dist: trusty

.travis/yapf.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+# Cause the script to exit if a single command fails
+set -e
+
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE:-$0}")"; pwd)
+
+pushd $ROOT_DIR/../test
+  find . -name '*.py' -type f -exec yapf --style=pep8 -i -r {} \;
+popd
+
+pushd $ROOT_DIR/../python
+  find . -name '*.py' -type f -not -path './ray/dataframe/*' -not -path './ray/rllib/*' -not -path './ray/cloudpickle/*' -exec yapf --style=pep8 -i -r {} \;
+popd
+
+CHANGED_FILES=(`git diff --name-only`)
+if [ "$CHANGED_FILES" ]; then
+  echo 'Reformatted staged files. Please review and stage the changes.'
+  echo
+  echo 'Files updated:'
+  for file in ${CHANGED_FILES[@]}; do
+    echo "  $file"
+  done
+  exit 1
+else
+  exit 0
+fi

python/ray/__init__.py

@@ -12,8 +12,8 @@ if "pyarrow" in sys.modules:
 
 # Add the directory containing pyarrow to the Python path so that we find the
 # pyarrow version packaged with ray and not a pre-existing pyarrow.
-pyarrow_path = os.path.join(os.path.abspath(os.path.dirname(__file__)),
-                            "pyarrow_files")
+pyarrow_path = os.path.join(
+    os.path.abspath(os.path.dirname(__file__)), "pyarrow_files")
 sys.path.insert(0, pyarrow_path)
 
 # See https://github.com/ray-project/ray/issues/131.
@@ -27,29 +27,29 @@ If you are using Anaconda, try fixing this problem by running:
 try:
     import pyarrow  # noqa: F401
 except ImportError as e:
-    if ((hasattr(e, "msg") and isinstance(e.msg, str) and
-            ("libstdc++" in e.msg or "CXX" in e.msg))):
+    if ((hasattr(e, "msg") and isinstance(e.msg, str)
+         and ("libstdc++" in e.msg or "CXX" in e.msg))):
         # This code path should be taken with Python 3.
         e.msg += helpful_message
-    elif (hasattr(e, "message") and isinstance(e.message, str) and
-          ("libstdc++" in e.message or "CXX" in e.message)):
+    elif (hasattr(e, "message") and isinstance(e.message, str)
+          and ("libstdc++" in e.message or "CXX" in e.message)):
         # This code path should be taken with Python 2.
-        condition = (hasattr(e, "args") and isinstance(e.args, tuple) and
-                     len(e.args) == 1 and isinstance(e.args[0], str))
+        condition = (hasattr(e, "args") and isinstance(e.args, tuple)
+                     and len(e.args) == 1 and isinstance(e.args[0], str))
         if condition:
-            e.args = (e.args[0] + helpful_message,)
+            e.args = (e.args[0] + helpful_message, )
         else:
             if not hasattr(e, "args"):
                 e.args = ()
             elif not isinstance(e.args, tuple):
-                e.args = (e.args,)
-            e.args += (helpful_message,)
+                e.args = (e.args, )
+            e.args += (helpful_message, )
     raise
 
 from ray.local_scheduler import _config  # noqa: E402
-from ray.worker import (error_info, init, connect, disconnect,
-                        get, put, wait, remote, log_event, log_span,
-                        flush_log, get_gpu_ids, get_webui_url,
+from ray.worker import (error_info, init, connect, disconnect, get, put, wait,
+                        remote, log_event, log_span, flush_log, get_gpu_ids,
+                        get_webui_url,
                         register_custom_serializer)  # noqa: E402
 from ray.worker import (SCRIPT_MODE, WORKER_MODE, PYTHON_MODE,
                         SILENT_MODE)  # noqa: E402
@@ -63,11 +63,13 @@ from ray.actor import method  # noqa: E402
 # Fix this.
 __version__ = "0.4.0"
 
-__all__ = ["error_info", "init", "connect", "disconnect", "get", "put", "wait",
+__all__ = [
+    "error_info", "init", "connect", "disconnect", "get", "put", "wait",
     "remote", "log_event", "log_span", "flush_log", "actor", "method",
     "get_gpu_ids", "get_webui_url", "register_custom_serializer",
-           "SCRIPT_MODE", "WORKER_MODE", "PYTHON_MODE", "SILENT_MODE",
-           "global_state", "_config", "__version__"]
+    "SCRIPT_MODE", "WORKER_MODE", "PYTHON_MODE", "SILENT_MODE", "global_state",
+    "_config", "__version__"
+]
 
 import ctypes  # noqa: E402
 # Windows only

python/ray/actor.py

@@ -121,16 +121,17 @@ def save_and_log_checkpoint(worker, actor):
     try:
         actor.__ray_checkpoint__()
     except Exception:
-        traceback_str = ray.utils.format_error_message(
-            traceback.format_exc())
+        traceback_str = ray.utils.format_error_message(traceback.format_exc())
         # Log the error message.
         ray.utils.push_error_to_driver(
             worker.redis_client,
             "checkpoint",
             traceback_str,
             driver_id=worker.task_driver_id.id(),
-            data={"actor_class": actor.__class__.__name__,
-                  "function_name": actor.__ray_checkpoint__.__name__})
+            data={
+                "actor_class": actor.__class__.__name__,
+                "function_name": actor.__ray_checkpoint__.__name__
+            })
 
 
 def restore_and_log_checkpoint(worker, actor):
@@ -144,8 +145,7 @@ def restore_and_log_checkpoint(worker, actor):
     try:
         checkpoint_resumed = actor.__ray_checkpoint_restore__()
     except Exception:
-        traceback_str = ray.utils.format_error_message(
-            traceback.format_exc())
+        traceback_str = ray.utils.format_error_message(traceback.format_exc())
         # Log the error message.
         ray.utils.push_error_to_driver(
             worker.redis_client,
@@ -154,8 +154,8 @@ def restore_and_log_checkpoint(worker, actor):
             driver_id=worker.task_driver_id.id(),
             data={
                 "actor_class": actor.__class__.__name__,
-                "function_name":
-                actor.__ray_checkpoint_restore__.__name__})
+                "function_name": actor.__ray_checkpoint_restore__.__name__
+            })
     return checkpoint_resumed
 
 
@@ -197,15 +197,15 @@ def make_actor_method_executor(worker, method_name, method, actor_imported):
                 return
 
         # Determine whether we should checkpoint the actor.
-        checkpointing_on = (actor_imported and
-                            worker.actor_checkpoint_interval > 0)
+        checkpointing_on = (actor_imported
+                            and worker.actor_checkpoint_interval > 0)
         # We should checkpoint the actor if user checkpointing is on, we've
         # executed checkpoint_interval tasks since the last checkpoint, and the
         # method we're about to execute is not a checkpoint.
-        save_checkpoint = (checkpointing_on and
-                           (worker.actor_task_counter %
-                            worker.actor_checkpoint_interval == 0 and
-                            method_name != "__ray_checkpoint__"))
+        save_checkpoint = (
+            checkpointing_on and
+            (worker.actor_task_counter % worker.actor_checkpoint_interval == 0
+             and method_name != "__ray_checkpoint__"))
 
         # Execute the assigned method and save a checkpoint if necessary.
         try:
@@ -238,14 +238,14 @@ def fetch_and_register_actor(actor_class_key, resources, worker):
         worker: The worker to use.
     """
     actor_id_str = worker.actor_id
-    (driver_id, class_id, class_name,
-     module, pickled_class, checkpoint_interval,
-     actor_method_names,
+    (driver_id, class_id, class_name, module, pickled_class,
+     checkpoint_interval, actor_method_names,
      actor_method_num_return_vals) = worker.redis_client.hmget(
-         actor_class_key, ["driver_id", "class_id", "class_name", "module",
-                           "class", "checkpoint_interval",
-                           "actor_method_names",
-                           "actor_method_num_return_vals"])
+         actor_class_key, [
+             "driver_id", "class_id", "class_name", "module", "class",
+             "checkpoint_interval", "actor_method_names",
+             "actor_method_num_return_vals"
+         ])
 
     actor_name = class_name.decode("ascii")
     module = module.decode("ascii")
@@ -259,12 +259,14 @@ def fetch_and_register_actor(actor_class_key, resources, worker):
     # error messages and to prevent the driver from hanging).
     class TemporaryActor(object):
         pass
+
     worker.actors[actor_id_str] = TemporaryActor()
     worker.actor_checkpoint_interval = checkpoint_interval
 
     def temporary_actor_method(*xs):
         raise Exception("The actor with name {} failed to be imported, and so "
                         "cannot execute this method".format(actor_name))
+
     # Register the actor method signatures.
     register_actor_signatures(worker, driver_id, class_id, class_name,
                               actor_method_names, actor_method_num_return_vals)
@@ -272,7 +274,8 @@ def fetch_and_register_actor(actor_class_key, resources, worker):
     for actor_method_name in actor_method_names:
         function_id = compute_actor_method_function_id(class_name,
                                                        actor_method_name).id()
-        temporary_executor = make_actor_method_executor(worker,
+        temporary_executor = make_actor_method_executor(
+            worker,
             actor_method_name,
             temporary_actor_method,
             actor_imported=False)
@@ -288,8 +291,11 @@ def fetch_and_register_actor(actor_class_key, resources, worker):
         # traceback and notify the scheduler of the failure.
         traceback_str = ray.utils.format_error_message(traceback.format_exc())
         # Log the error message.
-        push_error_to_driver(worker.redis_client, "register_actor_signatures",
-                             traceback_str, driver_id,
+        push_error_to_driver(
+            worker.redis_client,
+            "register_actor_signatures",
+            traceback_str,
+            driver_id,
             data={"actor_id": actor_id_str})
         # TODO(rkn): In the future, it might make sense to have the worker exit
         # here. However, currently that would lead to hanging if someone calls
@@ -298,16 +304,17 @@ def fetch_and_register_actor(actor_class_key, resources, worker):
         # TODO(pcm): Why is the below line necessary?
         unpickled_class.__module__ = module
         worker.actors[actor_id_str] = unpickled_class.__new__(unpickled_class)
-        actor_methods = inspect.getmembers(
-            unpickled_class, predicate=(lambda x: (inspect.isfunction(x) or
-                                                   inspect.ismethod(x) or
-                                                   is_cython(x))))
+
+        def pred(x):
+            return (inspect.isfunction(x) or inspect.ismethod(x)
+                    or is_cython(x))
+
+        actor_methods = inspect.getmembers(unpickled_class, predicate=pred)
         for actor_method_name, actor_method in actor_methods:
             function_id = compute_actor_method_function_id(
                 class_name, actor_method_name).id()
-            executor = make_actor_method_executor(worker, actor_method_name,
-                                                  actor_method,
-                                                  actor_imported=True)
+            executor = make_actor_method_executor(
+                worker, actor_method_name, actor_method, actor_imported=True)
             worker.functions[driver_id][function_id] = (actor_method_name,
                                                         executor)
             # We do not set worker.function_properties[driver_id][function_id]
@@ -315,7 +322,10 @@ def fetch_and_register_actor(actor_class_key, resources, worker):
             # for the actor.
 
 
-def register_actor_signatures(worker, driver_id, class_id, class_name,
+def register_actor_signatures(worker,
+                              driver_id,
+                              class_id,
+                              class_name,
                               actor_method_names,
                               actor_method_num_return_vals,
                               actor_creation_resources=None,
@@ -346,7 +356,8 @@ def register_actor_signatures(worker, driver_id, class_id, class_name,
             # The extra return value is an actor dummy object.
             # In the cases where actor_method_cpus is None, that value should
             # never be used.
-            FunctionProperties(num_return_vals=num_return_vals + 1,
+            FunctionProperties(
+                num_return_vals=num_return_vals + 1,
                 resources={"CPU": actor_method_cpus},
                 max_calls=0))
 
@@ -355,7 +366,8 @@ def register_actor_signatures(worker, driver_id, class_id, class_name,
         function_id = compute_actor_creation_function_id(class_id)
         worker.function_properties[driver_id][function_id.id()] = (
             # The extra return value is an actor dummy object.
-            FunctionProperties(num_return_vals=0 + 1,
+            FunctionProperties(
+                num_return_vals=0 + 1,
                 resources=actor_creation_resources,
                 max_calls=0))
 
@@ -380,8 +392,8 @@ def publish_actor_class_to_key(key, actor_class_info, worker):
 
 
 def export_actor_class(class_id, Class, actor_method_names,
-                       actor_method_num_return_vals,
-                       checkpoint_interval, worker):
+                       actor_method_num_return_vals, checkpoint_interval,
+                       worker):
     key = b"ActorClass:" + class_id
     actor_class_info = {
         "class_name": Class.__name__,
@@ -389,8 +401,9 @@ def export_actor_class(class_id, Class, actor_method_names,
         "class": pickle.dumps(Class),
         "checkpoint_interval": checkpoint_interval,
         "actor_method_names": json.dumps(list(actor_method_names)),
-        "actor_method_num_return_vals": json.dumps(
-            actor_method_num_return_vals)}
+        "actor_method_num_return_vals":
+        json.dumps(actor_method_num_return_vals)
+    }
 
     if worker.mode is None:
         # This means that 'ray.init()' has not been called yet and so we must
@@ -433,7 +446,11 @@ def export_actor(actor_id, class_id, class_name, actor_method_names,
 
     driver_id = worker.task_driver_id.id()
     register_actor_signatures(
-        worker, driver_id, class_id, class_name, actor_method_names,
+        worker,
+        driver_id,
+        class_id,
+        class_name,
+        actor_method_names,
         actor_method_num_return_vals,
         actor_creation_resources=actor_creation_resources,
         actor_method_cpus=actor_method_cpus)
@@ -466,12 +483,14 @@ class ActorMethod(object):
     def __call__(self, *args, **kwargs):
         raise Exception("Actor methods cannot be called directly. Instead "
                         "of running 'object.{}()', try "
-                        "'object.{}.remote()'."
-                        .format(self._method_name, self._method_name))
+                        "'object.{}.remote()'.".format(self._method_name,
+                                                       self._method_name))
 
     def remote(self, *args, **kwargs):
         return self._actor._actor_method_call(
-            self._method_name, args=args, kwargs=kwargs,
+            self._method_name,
+            args=args,
+            kwargs=kwargs,
             dependency=self._actor._ray_actor_cursor)
 
 
@@ -481,12 +500,13 @@ class ActorHandleWrapper(object):
     This is essentially just a dictionary, but it is used so that the recipient
     can tell that an argument is an ActorHandle.
     """
+
     def __init__(self, actor_id, class_id, actor_handle_id, actor_cursor,
                  actor_counter, actor_method_names,
                  actor_method_num_return_vals, method_signatures,
                  checkpoint_interval, class_name,
-                 actor_creation_dummy_object_id,
-                 actor_creation_resources, actor_method_cpus):
+                 actor_creation_dummy_object_id, actor_creation_resources,
+                 actor_method_cpus):
         # TODO(rkn): Some of these fields are probably not necessary. We should
         # strip out the unnecessary fields to keep actor handles lightweight.
         self.actor_id = actor_id
@@ -545,27 +565,20 @@ def unwrap_actor_handle(worker, wrapper):
         The unwrapped ActorHandle instance.
     """
     driver_id = worker.task_driver_id.id()
-    register_actor_signatures(worker, driver_id, wrapper.class_id,
-                              wrapper.class_name, wrapper.actor_method_names,
-                              wrapper.actor_method_num_return_vals,
-                              wrapper.actor_creation_resources,
-                              wrapper.actor_method_cpus)
+    register_actor_signatures(
+        worker, driver_id, wrapper.class_id, wrapper.class_name,
+        wrapper.actor_method_names, wrapper.actor_method_num_return_vals,
+        wrapper.actor_creation_resources, wrapper.actor_method_cpus)
 
     actor_handle_class = make_actor_handle_class(wrapper.class_name)
     actor_object = actor_handle_class.__new__(actor_handle_class)
     actor_object._manual_init(
-        wrapper.actor_id,
-        wrapper.class_id,
-        wrapper.actor_handle_id,
-        wrapper.actor_cursor,
-        wrapper.actor_counter,
-        wrapper.actor_method_names,
-        wrapper.actor_method_num_return_vals,
-        wrapper.method_signatures,
-        wrapper.checkpoint_interval,
+        wrapper.actor_id, wrapper.class_id, wrapper.actor_handle_id,
+        wrapper.actor_cursor, wrapper.actor_counter,
+        wrapper.actor_method_names, wrapper.actor_method_num_return_vals,
+        wrapper.method_signatures, wrapper.checkpoint_interval,
         wrapper.actor_creation_dummy_object_id,
-        wrapper.actor_creation_resources,
-        wrapper.actor_method_cpus)
+        wrapper.actor_creation_resources, wrapper.actor_method_cpus)
     return actor_object
 
 
@@ -612,7 +625,10 @@ def make_actor_handle_class(class_name):
             self._ray_actor_creation_resources = actor_creation_resources
             self._ray_actor_method_cpus = actor_method_cpus
 
-        def _actor_method_call(self, method_name, args=None, kwargs=None,
+        def _actor_method_call(self,
+                               method_name,
+                               args=None,
+                               kwargs=None,
                                dependency=None):
             """Method execution stub for an actor handle.
 
@@ -663,7 +679,9 @@ def make_actor_handle_class(class_name):
             function_id = compute_actor_method_function_id(
                 self._ray_class_name, method_name)
             object_ids = ray.worker.global_worker.submit_task(
-                function_id, args, actor_id=self._ray_actor_id,
+                function_id,
+                args,
+                actor_id=self._ray_actor_id,
                 actor_handle_id=self._ray_actor_handle_id,
                 actor_counter=self._ray_actor_counter,
                 is_actor_checkpoint_method=is_actor_checkpoint_method,
@@ -722,8 +740,8 @@ def make_actor_handle_class(class_name):
                     self._ray_actor_handle_id.id() == ray.worker.NIL_ACTOR_ID):
                 # TODO(rkn): Should we be passing in the actor cursor as a
                 # dependency here?
-                self._actor_method_call("__ray_terminate__",
-                                        args=[self._ray_actor_id.id()])
+                self._actor_method_call(
+                    "__ray_terminate__", args=[self._ray_actor_id.id()])
 
     return ActorHandle
 
@@ -735,7 +753,6 @@ def actor_handle_from_class(Class, class_id, actor_creation_resources,
     exported = []
 
     class ActorHandle(actor_handle_class):
-
         @classmethod
         def remote(cls, *args, **kwargs):
             if ray.worker.global_worker.mode is None:
@@ -754,11 +771,13 @@ def actor_handle_from_class(Class, class_id, actor_creation_resources,
             actor_cursor = None
             # The number of actor method invocations that we've called so far.
             actor_counter = 0
+
             # Get the actor methods of the given class.
-            actor_methods = inspect.getmembers(
-                Class, predicate=(lambda x: (inspect.isfunction(x) or
-                                             inspect.ismethod(x) or
-                                             is_cython(x))))
+            def pred(x):
+                return (inspect.isfunction(x) or inspect.ismethod(x)
+                        or is_cython(x))
+
+            actor_methods = inspect.getmembers(Class, predicate=pred)
             # Extract the signatures of each of the methods. This will be used
             # to catch some errors if the methods are called with inappropriate
             # arguments.
@@ -773,8 +792,9 @@ def actor_handle_from_class(Class, class_id, actor_creation_resources,
                 method_signatures[k] = signature.extract_signature(
                     v, ignore_first=True)
 
-            actor_method_names = [method_name for method_name, _ in
-                                  actor_methods]
+            actor_method_names = [
+                method_name for method_name, _ in actor_methods
+            ]
             actor_method_num_return_vals = []
             for _, method in actor_methods:
                 if hasattr(method, "__ray_num_return_vals__"):
@@ -796,28 +816,27 @@ def actor_handle_from_class(Class, class_id, actor_creation_resources,
                                        checkpoint_interval,
                                        ray.worker.global_worker)
                     exported.append(0)
-                actor_cursor = export_actor(actor_id, class_id, class_name,
-                                            actor_method_names,
-                                            actor_method_num_return_vals,
-                                            actor_creation_resources,
-                                            actor_method_cpus,
-                                            ray.worker.global_worker)
+                actor_cursor = export_actor(
+                    actor_id, class_id, class_name, actor_method_names,
+                    actor_method_num_return_vals, actor_creation_resources,
+                    actor_method_cpus, ray.worker.global_worker)
             # Increment the actor counter to account for the creation task.
             actor_counter += 1
 
             # Instantiate the actor handle.
             actor_object = cls.__new__(cls)
-            actor_object._manual_init(actor_id, class_id, actor_handle_id,
-                                      actor_cursor, actor_counter,
-                                      actor_method_names,
-                                      actor_method_num_return_vals,
-                                      method_signatures, checkpoint_interval,
-                                      actor_cursor, actor_creation_resources,
+            actor_object._manual_init(
+                actor_id, class_id, actor_handle_id, actor_cursor,
+                actor_counter, actor_method_names,
+                actor_method_num_return_vals, method_signatures,
+                checkpoint_interval, actor_cursor, actor_creation_resources,
                 actor_method_cpus)
 
             # Call __init__ as a remote function.
             if "__init__" in actor_object._ray_actor_method_names:
-                actor_object._actor_method_call("__init__", args=args,
+                actor_object._actor_method_call(
+                    "__init__",
+                    args=args,
                     kwargs=kwargs,
                     dependency=actor_cursor)
             else:

python/ray/autoscaler/autoscaler.py

@@ -51,25 +51,32 @@ CLUSTER_CONFIG_SCHEMA = {
     "idle_timeout_minutes": (int, OPTIONAL),
 
     # Cloud-provider specific configuration.
-    "provider": ({
+    "provider": (
+        {
             "type": (str, REQUIRED),  # e.g. aws
             "region": (str, OPTIONAL),  # e.g. us-east-1
             "availability_zone": (str, OPTIONAL),  # e.g. us-east-1a
-        "module": (str, OPTIONAL),  # module, if using external node provider
-    }, REQUIRED),
+            "module": (str,
+                       OPTIONAL),  # module, if using external node provider
+        },
+        REQUIRED),
 
     # How Ray will authenticate with newly launched nodes.
-    "auth": ({
+    "auth": (
+        {
             "ssh_user": (str, REQUIRED),  # e.g. ubuntu
             "ssh_private_key": (str, OPTIONAL),
-    }, REQUIRED),
+        },
+        REQUIRED),
 
     # Docker configuration. If this is specified, all setup and start commands
     # will be executed in the container.
-    "docker": ({
+    "docker": (
+        {
             "image": (str, OPTIONAL),  # e.g. tensorflow/tensorflow:1.5.0-py3
             "container_name": (str, OPTIONAL),  # e.g., ray_docker
-    }, OPTIONAL),
+        },
+        OPTIONAL),
 
     # Provider-specific config for the head node, e.g. instance type.
     "head_node": (dict, OPTIONAL),
@@ -137,9 +144,9 @@ class LoadMetrics(object):
             for unwanted_key in unwanted:
                 del mapping[unwanted_key]
             if unwanted:
-                print(
-                    "Removed {} stale ip mappings: {} not in {}".format(
+                print("Removed {} stale ip mappings: {} not in {}".format(
                     len(unwanted), unwanted, active_ips))
+
         prune(self.last_used_time_by_ip)
         prune(self.static_resources_by_ip)
         prune(self.dynamic_resources_by_ip)
@@ -148,10 +155,8 @@ class LoadMetrics(object):
         return self._info()["NumNodesUsed"]
 
     def debug_string(self):
-        return " - {}".format(
-            "\n - ".join(
-                ["{}: {}".format(k, v)
-                 for k, v in sorted(self._info().items())]))
+        return " - {}".format("\n - ".join(
+            ["{}: {}".format(k, v) for k, v in sorted(self._info().items())]))
 
     def _info(self):
         nodes_used = 0.0
@@ -176,14 +181,19 @@ class LoadMetrics(object):
             nodes_used += max_frac
         idle_times = [now - t for t in self.last_used_time_by_ip.values()]
         return {
-            "ResourceUsage": ", ".join([
+            "ResourceUsage":
+            ", ".join([
                 "{}/{} {}".format(
                     round(resources_used[rid], 2),
                     round(resources_total[rid], 2), rid)
-                for rid in sorted(resources_used)]),
-            "NumNodesConnected": len(self.static_resources_by_ip),
-            "NumNodesUsed": round(nodes_used, 2),
-            "NodeIdleSeconds": "Min={} Mean={} Max={}".format(
+                for rid in sorted(resources_used)
+            ]),
+            "NumNodesConnected":
+            len(self.static_resources_by_ip),
+            "NumNodesUsed":
+            round(nodes_used, 2),
+            "NodeIdleSeconds":
+            "Min={} Mean={} Max={}".format(
                 int(np.min(idle_times)) if idle_times else -1,
                 int(np.mean(idle_times)) if idle_times else -1,
                 int(np.max(idle_times)) if idle_times else -1),
@@ -208,18 +218,20 @@ class StandardAutoscaler(object):
     until the target cluster size is met).
     """
 
-    def __init__(
-            self, config_path, load_metrics,
+    def __init__(self,
+                 config_path,
+                 load_metrics,
                  max_concurrent_launches=AUTOSCALER_MAX_CONCURRENT_LAUNCHES,
                  max_failures=AUTOSCALER_MAX_NUM_FAILURES,
-            process_runner=subprocess, verbose_updates=False,
+                 process_runner=subprocess,
+                 verbose_updates=False,
                  node_updater_cls=NodeUpdaterProcess,
                  update_interval_s=AUTOSCALER_UPDATE_INTERVAL_S):
         self.config_path = config_path
         self.reload_config(errors_fatal=True)
         self.load_metrics = load_metrics
-        self.provider = get_node_provider(
-            self.config["provider"], self.config["cluster_name"])
+        self.provider = get_node_provider(self.config["provider"],
+                                          self.config["cluster_name"])
 
         self.max_failures = max_failures
         self.max_concurrent_launches = max_concurrent_launches
@@ -245,8 +257,7 @@ class StandardAutoscaler(object):
             self.reload_config(errors_fatal=False)
             self._update()
         except Exception as e:
-            print(
-                "StandardAutoscaler: Error during autoscaling: {}",
+            print("StandardAutoscaler: Error during autoscaling: {}",
                   traceback.format_exc())
             self.num_failures += 1
             if self.num_failures > self.max_failures:
@@ -274,14 +285,12 @@ class StandardAutoscaler(object):
             if node_ip in last_used and last_used[node_ip] < horizon and \
                     len(nodes) - num_terminated > self.config["min_workers"]:
                 num_terminated += 1
-                print(
-                    "StandardAutoscaler: Terminating idle node: "
+                print("StandardAutoscaler: Terminating idle node: "
                       "{}".format(node_id))
                 self.provider.terminate_node(node_id)
             elif not self.launch_config_ok(node_id):
                 num_terminated += 1
-                print(
-                    "StandardAutoscaler: Terminating outdated node: "
+                print("StandardAutoscaler: Terminating outdated node: "
                       "{}".format(node_id))
                 self.provider.terminate_node(node_id)
         if num_terminated > 0:
@@ -292,8 +301,7 @@ class StandardAutoscaler(object):
         num_terminated = 0
         while len(nodes) > self.config["max_workers"]:
             num_terminated += 1
-            print(
-                "StandardAutoscaler: Terminating unneeded node: "
+            print("StandardAutoscaler: Terminating unneeded node: "
                   "{}".format(nodes[-1]))
             self.provider.terminate_node(nodes[-1])
             nodes = nodes[:-1]
@@ -339,13 +347,13 @@ class StandardAutoscaler(object):
             with open(self.config_path) as f:
                 new_config = yaml.load(f.read())
             validate_config(new_config)
-            new_launch_hash = hash_launch_conf(
-                new_config["worker_nodes"], new_config["auth"])
-            new_runtime_hash = hash_runtime_conf(
-                new_config["file_mounts"],
-                [new_config["setup_commands"],
+            new_launch_hash = hash_launch_conf(new_config["worker_nodes"],
+                                               new_config["auth"])
+            new_runtime_hash = hash_runtime_conf(new_config["file_mounts"], [
+                new_config["setup_commands"],
                 new_config["worker_setup_commands"],
-                 new_config["worker_start_ray_commands"]])
+                new_config["worker_start_ray_commands"]
+            ])
             self.config = new_config
             self.launch_hash = new_launch_hash
             self.runtime_hash = new_runtime_hash
@@ -353,16 +361,14 @@ class StandardAutoscaler(object):
             if errors_fatal:
                 raise e
             else:
-                print(
-                    "StandardAutoscaler: Error parsing config: {}",
+                print("StandardAutoscaler: Error parsing config: {}",
                       traceback.format_exc())
 
     def target_num_workers(self):
         target_frac = self.config["target_utilization_fraction"]
         cur_used = self.load_metrics.approx_workers_used()
         ideal_num_workers = int(np.ceil(cur_used / float(target_frac)))
-        return min(
-            self.config["max_workers"],
+        return min(self.config["max_workers"],
                    max(self.config["min_workers"], ideal_num_workers))
 
     def launch_config_ok(self, node_id):
@@ -393,8 +399,7 @@ class StandardAutoscaler(object):
             node_id,
             self.config["provider"],
             self.config["auth"],
-            self.config["cluster_name"],
-            {},
+            self.config["cluster_name"], {},
             with_head_node_ip(self.config["worker_start_ray_commands"]),
             self.runtime_hash,
             redirect_output=not self.verbose_updates,
@@ -409,12 +414,10 @@ class StandardAutoscaler(object):
             return
         if self.config.get("no_restart", False) and \
                 self.num_successful_updates.get(node_id, 0) > 0:
-            init_commands = (
-                self.config["setup_commands"] +
+            init_commands = (self.config["setup_commands"] +
                              self.config["worker_setup_commands"])
         else:
-            init_commands = (
-                self.config["setup_commands"] +
+            init_commands = (self.config["setup_commands"] +
                              self.config["worker_setup_commands"] +
                              self.config["worker_start_ray_commands"])
         updater = self.node_updater_cls(
@@ -445,14 +448,12 @@ class StandardAutoscaler(object):
         print("StandardAutoscaler: Launching {} new nodes".format(count))
         num_before = len(self.workers())
         self.provider.create_node(
-            self.config["worker_nodes"],
-            {
+            self.config["worker_nodes"], {
                 TAG_NAME: "ray-{}-worker".format(self.config["cluster_name"]),
                 TAG_RAY_NODE_TYPE: "Worker",
                 TAG_RAY_NODE_STATUS: "Uninitialized",
                 TAG_RAY_LAUNCH_CONFIG: self.launch_hash,
-            },
-            count)
+            }, count)
         # TODO(ekl) be less conservative in this check
         assert len(self.workers()) > num_before, \
             "Num nodes failed to increase after creating a new node"
@@ -472,8 +473,8 @@ class StandardAutoscaler(object):
             suffix += " ({} failed to update)".format(
                 len(self.num_failed_updates))
         return "StandardAutoscaler [{}]: {}/{} target nodes{}\n{}".format(
-            datetime.now(), len(nodes), self.target_num_workers(),
-            suffix, self.load_metrics.debug_string())
+            datetime.now(), len(nodes), self.target_num_workers(), suffix,
+            self.load_metrics.debug_string())
 
 
 def typename(v):
@@ -507,8 +508,7 @@ def check_extraneous(config, schema):
         raise ValueError("Config {} is not a dictionary".format(config))
     for k in config:
         if k not in schema:
-            raise ValueError(
-                "Unexpected config key `{}` not in {}".format(
+            raise ValueError("Unexpected config key `{}` not in {}".format(
                 k, list(schema.keys())))
         v, kreq = schema[k]
         if v is None:
@@ -517,7 +517,8 @@ def check_extraneous(config, schema):
             if not isinstance(config[k], v):
                 raise ValueError(
                     "Config key `{}` has wrong type {}, expected {}".format(
-                        k, type(config[k]).__name__, v.__name__))
+                        k,
+                        type(config[k]).__name__, v.__name__))
         else:
             check_extraneous(config[k], v)
 

python/ray/autoscaler/aws/config.py

@@ -25,11 +25,9 @@ assert StrictVersion(boto3.__version__) >= StrictVersion("1.4.8"), \
 def key_pair(i, region):
     """Returns the ith default (aws_key_pair_name, key_pair_path)."""
     if i == 0:
-        return (
-            "{}_{}".format(RAY, region),
+        return ("{}_{}".format(RAY, region),
                 os.path.expanduser("~/.ssh/{}_{}.pem".format(RAY, region)))
-    return (
-        "{}_{}_{}".format(RAY, i, region),
+    return ("{}_{}_{}".format(RAY, i, region),
             os.path.expanduser("~/.ssh/{}_{}_{}.pem".format(RAY, i, region)))
 
 
@@ -83,7 +81,9 @@ def _configure_iam_role(config):
                     "Statement": [
                         {
                             "Effect": "Allow",
-                            "Principal": {"Service": "ec2.amazonaws.com"},
+                            "Principal": {
+                                "Service": "ec2.amazonaws.com"
+                            },
                             "Action": "sts:AssumeRole",
                         },
                     ],
@@ -97,8 +97,7 @@ def _configure_iam_role(config):
         profile.add_role(RoleName=role.name)
         time.sleep(15)  # wait for propagation
 
-    print("Role not specified for head node, using {}".format(
-        profile.arn))
+    print("Role not specified for head node, using {}".format(profile.arn))
     config["head_node"]["IamInstanceProfile"] = {"Arn": profile.arn}
 
     return config
@@ -146,8 +145,10 @@ def _configure_key_pair(config):
 def _configure_subnet(config):
     ec2 = _resource("ec2", config)
     subnets = sorted(
-        [s for s in ec2.subnets.all()
-            if s.state == "available" and s.map_public_ip_on_launch],
+        [
+            s for s in ec2.subnets.all()
+            if s.state == "available" and s.map_public_ip_on_launch
+        ],
         reverse=True,  # sort from Z-A
         key=lambda subnet: subnet.availability_zone)
     if not subnets:
@@ -157,9 +158,9 @@ def _configure_subnet(config):
             "and trying this again. Note that the subnet must map public IPs "
             "on instance launch.")
     if "availability_zone" in config["provider"]:
-        default_subnet = next((s for s in subnets
-                               if s.availability_zone ==
-                               config["provider"]["availability_zone"]),
+        default_subnet = next((
+            s for s in subnets
+            if s.availability_zone == config["provider"]["availability_zone"]),
                               None)
         if not default_subnet:
             raise Exception(
@@ -209,11 +210,21 @@ def _configure_security_group(config):
 
     if not security_group.ip_permissions:
         security_group.authorize_ingress(
-            IpPermissions=[
-                {"FromPort": -1, "ToPort": -1, "IpProtocol": "-1",
-                 "UserIdGroupPairs": [{"GroupId": security_group.id}]},
-                {"FromPort": 22, "ToPort": 22, "IpProtocol": "TCP",
-                 "IpRanges": [{"CidrIp": "0.0.0.0/0"}]}])
+            IpPermissions=[{
+                "FromPort": -1,
+                "ToPort": -1,
+                "IpProtocol": "-1",
+                "UserIdGroupPairs": [{
+                    "GroupId": security_group.id
+                }]
+            }, {
+                "FromPort": 22,
+                "ToPort": 22,
+                "IpProtocol": "TCP",
+                "IpRanges": [{
+                    "CidrIp": "0.0.0.0/0"
+                }]
+            }])
 
     if "SecurityGroupIds" not in config["head_node"]:
         print("SecurityGroupIds not specified for head node, using {}".format(
@@ -231,8 +242,10 @@ def _configure_security_group(config):
 def _get_subnet_or_die(config, subnet_id):
     ec2 = _resource("ec2", config)
     subnet = list(
-        ec2.subnets.filter(Filters=[
-            {"Name": "subnet-id", "Values": [subnet_id]}]))
+        ec2.subnets.filter(Filters=[{
+            "Name": "subnet-id",
+            "Values": [subnet_id]
+        }]))
     assert len(subnet) == 1, "Subnet not found"
     subnet = subnet[0]
     return subnet
@@ -241,8 +254,10 @@ def _get_subnet_or_die(config, subnet_id):
 def _get_security_group(config, vpc_id, group_name):
     ec2 = _resource("ec2", config)
     existing_groups = list(
-        ec2.security_groups.filter(Filters=[
-            {"Name": "vpc-id", "Values": [vpc_id]}]))
+        ec2.security_groups.filter(Filters=[{
+            "Name": "vpc-id",
+            "Values": [vpc_id]
+        }]))
     for sg in existing_groups:
         if sg.group_name == group_name:
             return sg
@@ -270,8 +285,10 @@ def _get_instance_profile(profile_name, config):
 
 def _get_key(key_name, config):
     ec2 = _resource("ec2", config)
-    for key in ec2.key_pairs.filter(
-            Filters=[{"Name": "key-name", "Values": [key_name]}]):
+    for key in ec2.key_pairs.filter(Filters=[{
+            "Name": "key-name",
+            "Values": [key_name]
+    }]):
         if key.name == key_name:
             return key
 

python/ray/autoscaler/aws/node_provider.py

@@ -84,7 +84,8 @@ class AWSNodeProvider(NodeProvider):
         tag_pairs = []
         for k, v in tags.items():
             tag_pairs.append({
-                "Key": k, "Value": v,
+                "Key": k,
+                "Value": v,
             })
         node.create_tags(Tags=tag_pairs)
 
@@ -95,20 +96,20 @@ class AWSNodeProvider(NodeProvider):
             "Value": self.cluster_name,
         }]
         for k, v in tags.items():
-            tag_pairs.append(
-                {
+            tag_pairs.append({
                 "Key": k,
                 "Value": v,
             })
         conf.update({
-            "MinCount": 1,
-            "MaxCount": count,
-            "TagSpecifications": conf.get("TagSpecifications", []) + [
-                {
+            "MinCount":
+            1,
+            "MaxCount":
+            count,
+            "TagSpecifications":
+            conf.get("TagSpecifications", []) + [{
                 "ResourceType": "instance",
                 "Tags": tag_pairs,
-                }
-            ]
+            }]
         })
         self.ec2.create_instances(**conf)
 

python/ray/autoscaler/commands.py

@@ -23,9 +23,8 @@ from ray.autoscaler.tags import TAG_RAY_NODE_TYPE, TAG_RAY_LAUNCH_CONFIG, \
 from ray.autoscaler.updater import NodeUpdaterProcess
 
 
-def create_or_update_cluster(
-        config_file, override_min_workers, override_max_workers,
-        no_restart, yes):
+def create_or_update_cluster(config_file, override_min_workers,
+                             override_max_workers, no_restart, yes):
     """Create or updates an autoscaling Ray cluster from a config json."""
 
     config = yaml.load(open(config_file).read())
@@ -39,8 +38,8 @@ def create_or_update_cluster(
 
     importer = NODE_PROVIDERS.get(config["provider"]["type"])
     if not importer:
-        raise NotImplementedError(
-            "Unsupported provider {}".format(config["provider"]))
+        raise NotImplementedError("Unsupported provider {}".format(
+            config["provider"]))
 
     bootstrap_config, _ = importer()
     config = bootstrap_config(config)
@@ -129,8 +128,10 @@ def get_or_create_head_node(config, no_restart, yes):
     remote_config_file.write(json.dumps(remote_config))
     remote_config_file.flush()
     config["file_mounts"].update({
-        remote_key_path: config["auth"]["ssh_private_key"],
-        "~/ray_bootstrap_config.yaml": remote_config_file.name
+        remote_key_path:
+        config["auth"]["ssh_private_key"],
+        "~/ray_bootstrap_config.yaml":
+        remote_config_file.name
     })
 
     if no_restart:
@@ -160,28 +161,22 @@ def get_or_create_head_node(config, no_restart, yes):
         print("Error: updating {} failed".format(
             provider.external_ip(head_node)))
         sys.exit(1)
-    print(
-        "Head node up-to-date, IP address is: {}".format(
+    print("Head node up-to-date, IP address is: {}".format(
         provider.external_ip(head_node)))
 
     monitor_str = "tail -f /tmp/raylogs/monitor-*"
     for s in init_commands:
-        if ("ray start" in s and "docker exec" in s and
-                "--autoscaling-config" in s):
+        if ("ray start" in s and "docker exec" in s
+                and "--autoscaling-config" in s):
             monitor_str = "docker exec {} /bin/sh -c {}".format(
-                        config["docker"]["container_name"],
-                        quote(monitor_str))
-    print(
-        "To monitor auto-scaling activity, you can run:\n\n"
-        "  ssh -i {} {}@{} {}\n".format(
-            config["auth"]["ssh_private_key"],
+                config["docker"]["container_name"], quote(monitor_str))
+    print("To monitor auto-scaling activity, you can run:\n\n"
+          "  ssh -i {} {}@{} {}\n".format(config["auth"]["ssh_private_key"],
                                           config["auth"]["ssh_user"],
                                           provider.external_ip(head_node),
                                           quote(monitor_str)))
-    print(
-        "To login to the cluster, run:\n\n"
-        "  ssh -i {} {}@{}\n".format(
-            config["auth"]["ssh_private_key"],
+    print("To login to the cluster, run:\n\n"
+          "  ssh -i {} {}@{}\n".format(config["auth"]["ssh_private_key"],
                                        config["auth"]["ssh_user"],
                                        provider.external_ip(head_node)))
 

python/ray/autoscaler/docker.py

@@ -22,24 +22,21 @@ def dockerize_if_needed(config):
         assert cname, "Must provide container name!"
     docker_mounts = {dst: dst for dst in config["file_mounts"]}
     config["setup_commands"] = (
-        docker_install_cmds() +
-        docker_start_cmds(
-            config["auth"]["ssh_user"], docker_image,
-            docker_mounts, cname) +
-        with_docker_exec(
-            config["setup_commands"], container_name=cname))
+        docker_install_cmds() + docker_start_cmds(
+            config["auth"]["ssh_user"], docker_image, docker_mounts, cname) +
+        with_docker_exec(config["setup_commands"], container_name=cname))
 
     config["head_setup_commands"] = with_docker_exec(
         config["head_setup_commands"], container_name=cname)
     config["head_start_ray_commands"] = (
-        docker_autoscaler_setup(cname) +
-        with_docker_exec(
+        docker_autoscaler_setup(cname) + with_docker_exec(
             config["head_start_ray_commands"], container_name=cname))
 
     config["worker_setup_commands"] = with_docker_exec(
         config["worker_setup_commands"], container_name=cname)
     config["worker_start_ray_commands"] = with_docker_exec(
-        config["worker_start_ray_commands"], container_name=cname,
+        config["worker_start_ray_commands"],
+        container_name=cname,
         env_vars=["RAY_HEAD_IP"])
 
     return config
@@ -50,18 +47,21 @@ def with_docker_exec(cmds, container_name, env_vars=None):
     if env_vars:
         env_str = " ".join(
             ["-e {env}=${env}".format(env=env) for env in env_vars])
-    return ["docker exec {} {} /bin/sh -c {} ".format(
-        env_str, container_name, quote(cmd)) for cmd in cmds]
+    return [
+        "docker exec {} {} /bin/sh -c {} ".format(env_str, container_name,
+                                                  quote(cmd)) for cmd in cmds
+    ]
 
 
 def docker_install_cmds():
-    return [aptwait_cmd() + " && sudo apt-get update",
-            aptwait_cmd() + " && sudo apt-get install -y docker.io"]
+    return [
+        aptwait_cmd() + " && sudo apt-get update",
+        aptwait_cmd() + " && sudo apt-get install -y docker.io"
+    ]
 
 
 def aptwait_cmd():
-    return (
-        "while sudo fuser"
+    return ("while sudo fuser"
             " /var/{lib/{dpkg,apt/lists},cache/apt/archives}/lock"
             " >/dev/null 2>&1; "
             "do echo 'Waiting for release of dpkg/apt locks'; sleep 5; done")
@@ -77,10 +77,12 @@ def docker_start_cmds(user, image, mount, cname):
 
     # create flags
     # ports for the redis, object manager, and tune client
-    port_flags = " ".join(["-p {port}:{port}".format(port=port)
-                           for port in ["6379", "8076", "4321"]])
-    mount_flags = " ".join(["-v {src}:{dest}".format(src=k, dest=v)
-                            for k, v in mount.items()])
+    port_flags = " ".join([
+        "-p {port}:{port}".format(port=port)
+        for port in ["6379", "8076", "4321"]
+    ])
+    mount_flags = " ".join(
+        ["-v {src}:{dest}".format(src=k, dest=v) for k, v in mount.items()])
 
     # for click, used in ray cli
     env_vars = {"LC_ALL": "C.UTF-8", "LANG": "C.UTF-8"}
@@ -88,9 +90,10 @@ def docker_start_cmds(user, image, mount, cname):
         ["-e {name}={val}".format(name=k, val=v) for k, v in env_vars.items()])
 
     # docker run command
-    docker_run = ["docker", "run", "--rm", "--name {}".format(cname),
-                  "-d", "-it", port_flags, mount_flags, env_flags,
-                  "--net=host", image, "bash"]
+    docker_run = [
+        "docker", "run", "--rm", "--name {}".format(cname), "-d", "-it",
+        port_flags, mount_flags, env_flags, "--net=host", image, "bash"
+    ]
     cmds.append(" ".join(docker_run))
     docker_update = []
     docker_update.append("apt-get -y update")
@@ -107,7 +110,8 @@ def docker_autoscaler_setup(cname):
         base_path = os.path.basename(path)
         cmds.append("docker cp {path} {cname}:{dpath}".format(
             path=path, dpath=base_path, cname=cname))
-        cmds.extend(with_docker_exec(
+        cmds.extend(
+            with_docker_exec(
                 ["cp {} {}".format("/" + base_path, path)],
                 container_name=cname))
     return cmds

python/ray/autoscaler/node_provider.py

@@ -15,14 +15,15 @@ def import_aws():
 
 def load_aws_config():
     import ray.autoscaler.aws as ray_aws
-    return os.path.join(os.path.dirname(
-        ray_aws.__file__), "example-full.yaml")
+    return os.path.join(os.path.dirname(ray_aws.__file__), "example-full.yaml")
 
 
 def import_external():
     """Mock a normal provider importer."""
+
     def return_it_back(config):
         return config
+
     return return_it_back, None
 
 
@@ -55,8 +56,7 @@ def load_class(path):
     class_data = path.split(".")
     if len(class_data) < 2:
         raise ValueError(
-            "You need to pass a valid path like mymodule.provider_class"
-            )
+            "You need to pass a valid path like mymodule.provider_class")
     module_path = ".".join(class_data[:-1])
     class_str = class_data[-1]
     module = importlib.import_module(module_path)
@@ -71,8 +71,8 @@ def get_node_provider(provider_config, cluster_name):
     importer = NODE_PROVIDERS.get(provider_config["type"])
 
     if importer is None:
-        raise NotImplementedError(
-            "Unsupported node provider: {}".format(provider_config["type"]))
+        raise NotImplementedError("Unsupported node provider: {}".format(
+            provider_config["type"]))
     _, provider_cls = importer()
     return provider_cls(provider_config, cluster_name)
 
@@ -82,8 +82,8 @@ def get_default_config(provider_config):
         return {}
     load_config = DEFAULT_CONFIGS.get(provider_config["type"])
     if load_config is None:
-        raise NotImplementedError(
-            "Unsupported node provider: {}".format(provider_config["type"]))
+        raise NotImplementedError("Unsupported node provider: {}".format(
+            provider_config["type"]))
     path_to_default = load_config()
     with open(path_to_default) as f:
         defaults = yaml.load(f)

python/ray/autoscaler/tags.py

@@ -1,7 +1,6 @@
 from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
-
 """The Ray autoscaler uses tags to associate metadata with instances."""
 
 # Tag for the name of the node

python/ray/autoscaler/updater.py

@@ -26,9 +26,15 @@ def pretty_cmd(cmd_str):
 class NodeUpdater(object):
     """A process for syncing files and running init commands on a node."""
 
-    def __init__(
-            self, node_id, provider_config, auth_config, cluster_name,
-            file_mounts, setup_cmds, runtime_hash, redirect_output=True,
+    def __init__(self,
+                 node_id,
+                 provider_config,
+                 auth_config,
+                 cluster_name,
+                 file_mounts,
+                 setup_cmds,
+                 runtime_hash,
+                 redirect_output=True,
                  process_runner=subprocess):
         self.daemon = True
         self.process_runner = process_runner
@@ -66,13 +72,12 @@ class NodeUpdater(object):
                 "NodeUpdater: Error updating {}"
                 "See {} for remote logs.".format(error_str, self.output_name),
                 file=self.stdout)
-            self.provider.set_node_tags(
-                self.node_id, {TAG_RAY_NODE_STATUS: "UpdateFailed"})
+            self.provider.set_node_tags(self.node_id,
+                                        {TAG_RAY_NODE_STATUS: "UpdateFailed"})
             if self.logfile is not None:
-                print(
-                    "----- BEGIN REMOTE LOGS -----\n" +
-                    open(self.logfile.name).read() +
-                    "\n----- END REMOTE LOGS -----")
+                print("----- BEGIN REMOTE LOGS -----\n" + open(
+                    self.logfile.name).read() + "\n----- END REMOTE LOGS -----"
+                      )
             raise e
         self.provider.set_node_tags(
             self.node_id, {
@@ -85,8 +90,8 @@ class NodeUpdater(object):
             file=self.stdout)
 
     def do_update(self):
-        self.provider.set_node_tags(
-            self.node_id, {TAG_RAY_NODE_STATUS: "WaitingForSSH"})
+        self.provider.set_node_tags(self.node_id,
+                                    {TAG_RAY_NODE_STATUS: "WaitingForSSH"})
         deadline = time.time() + NODE_START_WAIT_S
 
         # Wait for external IP
@@ -114,7 +119,8 @@ class NodeUpdater(object):
                     raise Exception("Node not running yet...")
                 self.ssh_cmd(
                     "uptime",
-                    connect_timeout=5, redirect=open("/dev/null", "w"))
+                    connect_timeout=5,
+                    redirect=open("/dev/null", "w"))
                 ssh_ok = True
             except Exception as e:
                 retry_str = str(e)
@@ -130,8 +136,8 @@ class NodeUpdater(object):
         assert ssh_ok, "Unable to SSH to node"
 
         # Rsync file mounts
-        self.provider.set_node_tags(
-            self.node_id, {TAG_RAY_NODE_STATUS: "SyncingFiles"})
+        self.provider.set_node_tags(self.node_id,
+                                    {TAG_RAY_NODE_STATUS: "SyncingFiles"})
         for remote_path, local_path in self.file_mounts.items():
             print(
                 "NodeUpdater: Syncing {} to {}...".format(
@@ -143,18 +149,20 @@ class NodeUpdater(object):
                     local_path += "/"
                 if not remote_path.endswith("/"):
                     remote_path += "/"
-            self.ssh_cmd(
-                "mkdir -p {}".format(os.path.dirname(remote_path)))
-            self.process_runner.check_call([
+            self.ssh_cmd("mkdir -p {}".format(os.path.dirname(remote_path)))
+            self.process_runner.check_call(
+                [
                     "rsync", "-e", "ssh -i {} ".format(self.ssh_private_key) +
                     "-o ConnectTimeout=120s -o StrictHostKeyChecking=no",
                     "--delete", "-avz", "{}".format(local_path),
                     "{}@{}:{}".format(self.ssh_user, self.ssh_ip, remote_path)
-            ], stdout=self.stdout, stderr=self.stderr)
+                ],
+                stdout=self.stdout,
+                stderr=self.stderr)
 
         # Run init commands
-        self.provider.set_node_tags(
-            self.node_id, {TAG_RAY_NODE_STATUS: "SettingUp"})
+        self.provider.set_node_tags(self.node_id,
+                                    {TAG_RAY_NODE_STATUS: "SettingUp"})
         for cmd in self.setup_cmds:
             self.ssh_cmd(cmd, verbose=True)
 
@@ -165,13 +173,16 @@ class NodeUpdater(object):
                     pretty_cmd(cmd), self.ssh_ip),
                 file=self.stdout)
         force_interactive = "set -i && source ~/.bashrc && "
-        self.process_runner.check_call([
+        self.process_runner.check_call(
+            [
                 "ssh", "-o", "ConnectTimeout={}s".format(connect_timeout),
                 "-o", "StrictHostKeyChecking=no",
-            "-i", self.ssh_private_key,
-            "{}@{}".format(self.ssh_user, self.ssh_ip),
-            "bash --login -c {}".format(pipes.quote(force_interactive + cmd))
-        ], stdout=redirect or self.stdout, stderr=redirect or self.stderr)
+                "-i", self.ssh_private_key, "{}@{}".format(
+                    self.ssh_user, self.ssh_ip), "bash --login -c {}".format(
+                        pipes.quote(force_interactive + cmd))
+            ],
+            stdout=redirect or self.stdout,
+            stderr=redirect or self.stderr)
 
 
 class NodeUpdaterProcess(NodeUpdater, Process):

python/ray/common/redis_module/runtest.py

@@ -25,7 +25,7 @@ OBJECT_CHANNEL_PREFIX = "OC:"
 def integerToAsciiHex(num, numbytes):
     retstr = b""
     # Support 32 and 64 bit architecture.
-    assert(numbytes == 4 or numbytes == 8)
+    assert (numbytes == 4 or numbytes == 8)
     for i in range(numbytes):
         curbyte = num & 0xff
         if sys.version_info >= (3, 0):
@@ -50,7 +50,6 @@ def get_next_message(pubsub_client, timeout_seconds=10):
 
 
 class TestGlobalStateStore(unittest.TestCase):
-
     def setUp(self):
         redis_port, _ = ray.services.start_redis_instance()
         self.redis = redis.StrictRedis(host="localhost", port=redis_port, db=0)
@@ -192,16 +191,16 @@ class TestGlobalStateStore(unittest.TestCase):
         # notifications.
         def check_object_notification(notification_message, object_id,
                                       object_size, manager_ids):
-            notification_object = (SubscribeToNotificationsReply
-                                   .GetRootAsSubscribeToNotificationsReply(
+            notification_object = (SubscribeToNotificationsReply.
+                                   GetRootAsSubscribeToNotificationsReply(
                                        notification_message, 0))
             self.assertEqual(notification_object.ObjectId(), object_id)
             self.assertEqual(notification_object.ObjectSize(), object_size)
             self.assertEqual(notification_object.ManagerIdsLength(),
                              len(manager_ids))
             for i in range(len(manager_ids)):
-                self.assertEqual(notification_object.ManagerIds(i),
-                                 manager_ids[i])
+                self.assertEqual(
+                    notification_object.ManagerIds(i), manager_ids[i])
 
         data_size = 0xf1f0
         p = self.redis.pubsub()
@@ -215,9 +214,8 @@ class TestGlobalStateStore(unittest.TestCase):
         self.redis.execute_command("RAY.OBJECT_TABLE_REQUEST_NOTIFICATIONS",
                                    "manager_id1", "object_id1")
         # Verify that the notification is correct.
-        check_object_notification(get_next_message(p)["data"],
-                                  b"object_id1",
-                                  data_size,
+        check_object_notification(
+            get_next_message(p)["data"], b"object_id1", data_size,
             [b"manager_id2"])
 
         # Request a notification for an object that isn't there. Then add the
@@ -232,26 +230,22 @@ class TestGlobalStateStore(unittest.TestCase):
         self.redis.execute_command("RAY.OBJECT_TABLE_ADD", "object_id3",
                                    data_size, "hash1", "manager_id3")
         # Verify that the notification is correct.
-        check_object_notification(get_next_message(p)["data"],
-                                  b"object_id3",
-                                  data_size,
+        check_object_notification(
+            get_next_message(p)["data"], b"object_id3", data_size,
             [b"manager_id1"])
         self.redis.execute_command("RAY.OBJECT_TABLE_ADD", "object_id2",
                                    data_size, "hash1", "manager_id3")
         # Verify that the notification is correct.
-        check_object_notification(get_next_message(p)["data"],
-                                  b"object_id2",
-                                  data_size,
+        check_object_notification(
+            get_next_message(p)["data"], b"object_id2", data_size,
             [b"manager_id3"])
         # Request notifications for object_id3 again.
         self.redis.execute_command("RAY.OBJECT_TABLE_REQUEST_NOTIFICATIONS",
                                    "manager_id1", "object_id3")
         # Verify that the notification is correct.
-        check_object_notification(get_next_message(p)["data"],
-                                  b"object_id3",
-                                  data_size,
-                                  [b"manager_id1", b"manager_id2",
-                                   b"manager_id3"])
+        check_object_notification(
+            get_next_message(p)["data"], b"object_id3", data_size,
+            [b"manager_id1", b"manager_id2", b"manager_id3"])
 
     def testResultTableAddAndLookup(self):
         def check_result_table_entry(message, task_id, is_put):
@@ -349,8 +343,7 @@ class TestGlobalStateStore(unittest.TestCase):
         # update happens, and the response is still the same task.
         task_args = [task_args[0]] + task_args
         response = self.redis.execute_command("RAY.TASK_TABLE_TEST_AND_UPDATE",
-                                              "task_id",
-                                              *task_args[:3])
+                                              "task_id", *task_args[:3])
         check_task_reply(response, task_args[1:], updated=True)
         # Check that the task entry is still the same.
         get_response = self.redis.execute_command("RAY.TASK_TABLE_GET",
@@ -362,8 +355,7 @@ class TestGlobalStateStore(unittest.TestCase):
         # task.
         task_args[1] = TASK_STATUS_QUEUED
         response = self.redis.execute_command("RAY.TASK_TABLE_TEST_AND_UPDATE",
-                                              "task_id",
-                                              *task_args[:3])
+                                              "task_id", *task_args[:3])
         check_task_reply(response, task_args[1:], updated=True)
         # Check that the update happened.
         get_response = self.redis.execute_command("RAY.TASK_TABLE_GET",
@@ -375,8 +367,7 @@ class TestGlobalStateStore(unittest.TestCase):
         new_task_args = task_args[:]
         new_task_args[1] = TASK_STATUS_WAITING
         response = self.redis.execute_command("RAY.TASK_TABLE_TEST_AND_UPDATE",
-                                              "task_id",
-                                              *new_task_args[:3])
+                                              "task_id", *new_task_args[:3])
         check_task_reply(response, task_args[1:], updated=False)
         # Check that the update did not happen.
         get_response2 = self.redis.execute_command("RAY.TASK_TABLE_GET",
@@ -388,8 +379,7 @@ class TestGlobalStateStore(unittest.TestCase):
         task_args = new_task_args
         task_args[0] = TASK_STATUS_SCHEDULED | TASK_STATUS_QUEUED
         response = self.redis.execute_command("RAY.TASK_TABLE_TEST_AND_UPDATE",
-                                              "task_id",
-                                              *task_args[:3])
+                                              "task_id", *task_args[:3])
         check_task_reply(response, task_args[1:], updated=True)
 
         # If the test value is a bitmask that does not match the current value,
@@ -399,8 +389,7 @@ class TestGlobalStateStore(unittest.TestCase):
         new_task_args[0] = TASK_STATUS_SCHEDULED
         old_response = response
         response = self.redis.execute_command("RAY.TASK_TABLE_TEST_AND_UPDATE",
-                                              "task_id",
-                                              *new_task_args[:3])
+                                              "task_id", *new_task_args[:3])
         check_task_reply(response, task_args[1:], updated=False)
         # Check that the update did not happen.
         get_response = self.redis.execute_command("RAY.TASK_TABLE_GET",
@@ -409,8 +398,10 @@ class TestGlobalStateStore(unittest.TestCase):
         check_task_reply(get_response, task_args[1:])
 
     def check_task_subscription(self, p, scheduling_state, local_scheduler_id):
-        task_args = [b"task_id", scheduling_state,
-                     local_scheduler_id.encode("ascii"), b"", 0, b"task_spec"]
+        task_args = [
+            b"task_id", scheduling_state,
+            local_scheduler_id.encode("ascii"), b"", 0, b"task_spec"
+        ]
         self.redis.execute_command("RAY.TASK_TABLE_ADD", *task_args)
         # Receive the data.
         message = get_next_message(p)["data"]
@@ -418,8 +409,7 @@ class TestGlobalStateStore(unittest.TestCase):
         notification_object = TaskReply.GetRootAsTaskReply(message, 0)
         self.assertEqual(notification_object.TaskId(), task_args[0])
         self.assertEqual(notification_object.State(), task_args[1])
-        self.assertEqual(notification_object.LocalSchedulerId(),
-                         task_args[2])
+        self.assertEqual(notification_object.LocalSchedulerId(), task_args[2])
         self.assertEqual(notification_object.ExecutionDependencies(),
                          task_args[3])
         self.assertEqual(notification_object.TaskSpec(), task_args[-1])

python/ray/common/test/test.py

@@ -30,19 +30,23 @@ def random_task_id():
 
 BASE_SIMPLE_OBJECTS = [
     0, 1, 100000, 0.0, 0.5, 0.9, 100000.1, (), [], {}, "", 990 * "h", u"",
-    990 * u"h"]
+    990 * u"h"
+]
 
 if sys.version_info < (3, 0):
-    BASE_SIMPLE_OBJECTS += [long(0), long(1), long(100000), long(1 << 100)]  # noqa: E501,F821
+    BASE_SIMPLE_OBJECTS += [
+        long(0),  # noqa: E501,F821
+        long(1),  # noqa: E501,F821
+        long(100000),  # noqa: E501,F821
+        long(1 << 100)  # noqa: E501,F821
+    ]
 
 LIST_SIMPLE_OBJECTS = [[obj] for obj in BASE_SIMPLE_OBJECTS]
-TUPLE_SIMPLE_OBJECTS = [(obj,) for obj in BASE_SIMPLE_OBJECTS]
+TUPLE_SIMPLE_OBJECTS = [(obj, ) for obj in BASE_SIMPLE_OBJECTS]
 DICT_SIMPLE_OBJECTS = [{(): obj} for obj in BASE_SIMPLE_OBJECTS]
 
-SIMPLE_OBJECTS = (BASE_SIMPLE_OBJECTS +
-                  LIST_SIMPLE_OBJECTS +
-                  TUPLE_SIMPLE_OBJECTS +
-                  DICT_SIMPLE_OBJECTS)
+SIMPLE_OBJECTS = (BASE_SIMPLE_OBJECTS + LIST_SIMPLE_OBJECTS +
+                  TUPLE_SIMPLE_OBJECTS + DICT_SIMPLE_OBJECTS)
 
 # Create some complex objects that cannot be serialized by value in tasks.
 
@@ -55,21 +59,20 @@ class Foo(object):
         pass
 
 
-BASE_COMPLEX_OBJECTS = [999 * "h", 999 * u"h", lst, Foo(),
-                        10 * [10 * [10 * [1]]]]
+BASE_COMPLEX_OBJECTS = [
+    999 * "h", 999 * u"h", lst,
+    Foo(), 10 * [10 * [10 * [1]]]
+]
 
 LIST_COMPLEX_OBJECTS = [[obj] for obj in BASE_COMPLEX_OBJECTS]
-TUPLE_COMPLEX_OBJECTS = [(obj,) for obj in BASE_COMPLEX_OBJECTS]
+TUPLE_COMPLEX_OBJECTS = [(obj, ) for obj in BASE_COMPLEX_OBJECTS]
 DICT_COMPLEX_OBJECTS = [{(): obj} for obj in BASE_COMPLEX_OBJECTS]
 
-COMPLEX_OBJECTS = (BASE_COMPLEX_OBJECTS +
-                   LIST_COMPLEX_OBJECTS +
-                   TUPLE_COMPLEX_OBJECTS +
-                   DICT_COMPLEX_OBJECTS)
+COMPLEX_OBJECTS = (BASE_COMPLEX_OBJECTS + LIST_COMPLEX_OBJECTS +
+                   TUPLE_COMPLEX_OBJECTS + DICT_COMPLEX_OBJECTS)
 
 
 class TestSerialization(unittest.TestCase):
-
     def test_serialize_by_value(self):
 
         for val in SIMPLE_OBJECTS:
@@ -79,7 +82,6 @@ class TestSerialization(unittest.TestCase):
 
 
 class TestObjectID(unittest.TestCase):
-
     def test_create_object_id(self):
         random_object_id()
 
@@ -95,6 +97,7 @@ class TestObjectID(unittest.TestCase):
         def h():
             object_ids[0]
             return 1
+
         # Make sure that object IDs cannot be pickled (including functions that
         # close over object IDs).
         self.assertRaises(Exception, lambda: pickle.dumps(object_ids[0]))
@@ -113,10 +116,12 @@ class TestObjectID(unittest.TestCase):
         self.assertNotEqual(x1, y1)
 
         random_strings = [np.random.bytes(ID_SIZE) for _ in range(256)]
-        object_ids1 = [local_scheduler.ObjectID(random_strings[i])
-                       for i in range(256)]
-        object_ids2 = [local_scheduler.ObjectID(random_strings[i])
-                       for i in range(256)]
+        object_ids1 = [
+            local_scheduler.ObjectID(random_strings[i]) for i in range(256)
+        ]
+        object_ids2 = [
+            local_scheduler.ObjectID(random_strings[i]) for i in range(256)
+        ]
         self.assertEqual(len(set(object_ids1)), 256)
         self.assertEqual(len(set(object_ids1 + object_ids2)), 256)
         self.assertEqual(set(object_ids1), set(object_ids2))
@@ -129,7 +134,6 @@ class TestObjectID(unittest.TestCase):
 
 
 class TestTask(unittest.TestCase):
-
     def check_task(self, task, function_id, num_return_vals, args):
         self.assertEqual(function_id.id(), task.function_id().id())
         retrieved_args = task.arguments()
@@ -148,30 +152,16 @@ class TestTask(unittest.TestCase):
         parent_id = random_task_id()
         function_id = random_function_id()
         object_ids = [random_object_id() for _ in range(256)]
-        args_list = [
-            [],
-            1 * [1],
-            10 * [1],
-            100 * [1],
-            1000 * [1],
-            1 * ["a"],
-            10 * ["a"],
-            100 * ["a"],
-            1000 * ["a"],
-            [1, 1.3, 2, 1 << 100, "hi", u"hi", [1, 2]],
-            object_ids[:1],
-            object_ids[:2],
-            object_ids[:3],
-            object_ids[:4],
-            object_ids[:5],
-            object_ids[:10],
-            object_ids[:100],
-            object_ids[:256],
-            [1, object_ids[0]],
-            [object_ids[0], "a"],
-            [1, object_ids[0], "a"],
-            [object_ids[0], 1, object_ids[1], "a"],
-            object_ids[:3] + [1, "hi", 2.3] + object_ids[:5],
+        args_list = [[], 1 * [1], 10 * [1], 100 * [1], 1000 * [1], 1 * ["a"],
+                     10 * ["a"], 100 * ["a"], 1000 * ["a"], [
+                         1, 1.3, 2, 1 << 100, "hi", u"hi", [1, 2]
+                     ], object_ids[:1], object_ids[:2], object_ids[:3],
+                     object_ids[:4], object_ids[:5], object_ids[:10],
+                     object_ids[:100], object_ids[:256], [1, object_ids[0]], [
+                         object_ids[0], "a"
+                     ], [1, object_ids[0], "a"], [
+                         object_ids[0], 1, object_ids[1], "a"
+                     ], object_ids[:3] + [1, "hi", 2.3] + object_ids[:5],
                      object_ids + 100 * ["a"] + object_ids]
         for args in args_list:
             for num_return_vals in [0, 1, 2, 3, 5, 10, 100]:

python/ray/experimental/__init__.py

@@ -5,5 +5,7 @@ from __future__ import print_function
 from .tfutils import TensorFlowVariables
 from .features import flush_redis_unsafe, flush_task_and_object_metadata_unsafe
 
-__all__ = ["TensorFlowVariables", "flush_redis_unsafe",
-           "flush_task_and_object_metadata_unsafe"]
+__all__ = [
+    "TensorFlowVariables", "flush_redis_unsafe",
+    "flush_task_and_object_metadata_unsafe"
+]

python/ray/experimental/array/distributed/__init__.py

@@ -8,6 +8,8 @@ from .core import (BLOCK_SIZE, DistArray, assemble, zeros, ones, copy, eye,
                    triu, tril, blockwise_dot, dot, transpose, add, subtract,
                    numpy_to_dist, subblocks)
 
-__all__ = ["random", "linalg", "BLOCK_SIZE", "DistArray", "assemble", "zeros",
-           "ones", "copy", "eye", "triu", "tril", "blockwise_dot", "dot",
-           "transpose", "add", "subtract", "numpy_to_dist", "subblocks"]
+__all__ = [
+    "random", "linalg", "BLOCK_SIZE", "DistArray", "assemble", "zeros", "ones",
+    "copy", "eye", "triu", "tril", "blockwise_dot", "dot", "transpose", "add",
+    "subtract", "numpy_to_dist", "subblocks"
+]

python/ray/experimental/array/distributed/core.py

@@ -13,8 +13,9 @@ class DistArray(object):
     def __init__(self, shape, objectids=None):
         self.shape = shape
         self.ndim = len(shape)
-        self.num_blocks = [int(np.ceil(1.0 * a / BLOCK_SIZE))
-                           for a in self.shape]
+        self.num_blocks = [
+            int(np.ceil(1.0 * a / BLOCK_SIZE)) for a in self.shape
+        ]
         if objectids is not None:
             self.objectids = objectids
         else:
@@ -56,7 +57,7 @@ class DistArray(object):
 
     def assemble(self):
         """Assemble an array from a distributed array of object IDs."""
-        first_block = ray.get(self.objectids[(0,) * self.ndim])
+        first_block = ray.get(self.objectids[(0, ) * self.ndim])
         dtype = first_block.dtype
         result = np.zeros(self.shape, dtype=dtype)
         for index in np.ndindex(*self.num_blocks):
@@ -85,8 +86,8 @@ def numpy_to_dist(a):
     for index in np.ndindex(*result.num_blocks):
         lower = DistArray.compute_block_lower(index, a.shape)
         upper = DistArray.compute_block_upper(index, a.shape)
-        result.objectids[index] = ray.put(a[[slice(l, u) for (l, u)
-                                            in zip(lower, upper)]])
+        result.objectids[index] = ray.put(
+            a[[slice(l, u) for (l, u) in zip(lower, upper)]])
     return result
 
 
@@ -126,12 +127,11 @@ def eye(dim1, dim2=-1, dtype_name="float"):
     for (i, j) in np.ndindex(*result.num_blocks):
         block_shape = DistArray.compute_block_shape([i, j], shape)
         if i == j:
-            result.objectids[i, j] = ra.eye.remote(block_shape[0],
-                                                   block_shape[1],
-                                                   dtype_name=dtype_name)
+            result.objectids[i, j] = ra.eye.remote(
+                block_shape[0], block_shape[1], dtype_name=dtype_name)
         else:
-            result.objectids[i, j] = ra.zeros.remote(block_shape,
-                                                     dtype_name=dtype_name)
+            result.objectids[i, j] = ra.zeros.remote(
+                block_shape, dtype_name=dtype_name)
     return result
 
 
@@ -190,8 +190,8 @@ def dot(a, b):
                         "b.ndim = {}.".format(b.ndim))
     if a.shape[1] != b.shape[0]:
         raise Exception("dot expects a.shape[1] to equal b.shape[0], but "
-                        "a.shape = {} and b.shape = {}.".format(a.shape,
-                                                                b.shape))
+                        "a.shape = {} and b.shape = {}.".format(
+                            a.shape, b.shape))
     shape = [a.shape[0], b.shape[1]]
     result = DistArray(shape)
     for (i, j) in np.ndindex(*result.num_blocks):
@@ -227,8 +227,8 @@ def subblocks(a, *ranges):
                             "the {}th range is {}.".format(i, ranges[i]))
         if ranges[i][0] < 0:
             raise Exception("Values in the ranges passed to sub_blocks must "
-                            "be at least 0, but the {}th range is {}."
-                            .format(i, ranges[i]))
+                            "be at least 0, but the {}th range is {}.".format(
+                                i, ranges[i]))
         if ranges[i][-1] >= a.num_blocks[i]:
             raise Exception("Values in the ranges passed to sub_blocks must "
                             "be less than the relevant number of blocks, but "
@@ -240,8 +240,8 @@ def subblocks(a, *ranges):
              for i in range(a.ndim)]
     result = DistArray(shape)
     for index in np.ndindex(*result.num_blocks):
-        result.objectids[index] = a.objectids[tuple([ranges[i][index[i]]
-                                              for i in range(a.ndim)])]
+        result.objectids[index] = a.objectids[tuple(
+            [ranges[i][index[i]] for i in range(a.ndim)])]
     return result
 
 
@@ -249,8 +249,8 @@ def subblocks(a, *ranges):
 def transpose(a):
     if a.ndim != 2:
         raise Exception("transpose expects its argument to be 2-dimensional, "
-                        "but a.ndim = {}, a.shape = {}.".format(a.ndim,
-                                                                a.shape))
+                        "but a.ndim = {}, a.shape = {}.".format(
+                            a.ndim, a.shape))
     result = DistArray([a.shape[1], a.shape[0]])
     for i in range(result.num_blocks[0]):
         for j in range(result.num_blocks[1]):
@@ -263,8 +263,8 @@ def transpose(a):
 def add(x1, x2):
     if x1.shape != x2.shape:
         raise Exception("add expects arguments `x1` and `x2` to have the same "
-                        "shape, but x1.shape = {}, and x2.shape = {}."
-                        .format(x1.shape, x2.shape))
+                        "shape, but x1.shape = {}, and x2.shape = {}.".format(
+                            x1.shape, x2.shape))
     result = DistArray(x1.shape)
     for index in np.ndindex(*result.num_blocks):
         result.objectids[index] = ra.add.remote(x1.objectids[index],

python/ray/experimental/array/distributed/linalg.py

@@ -76,9 +76,10 @@ def tsqr(a):
                 lower = [a.shape[1], 0]
                 upper = [2 * a.shape[1], core.BLOCK_SIZE]
             ith_index //= 2
-            q_block_current = ra.dot.remote(
-                q_block_current, ra.subarray.remote(q_tree[ith_index, j],
-                                                    lower, upper))
+            q_block_current = ra.dot.remote(q_block_current,
+                                            ra.subarray.remote(
+                                                q_tree[ith_index, j], lower,
+                                                upper))
         q_result.objectids[i] = q_block_current
     r = current_rs[0]
     return q_result, ray.get(r)
@@ -196,8 +197,8 @@ def qr(a):
         if a.shape[0] > a.shape[1]:
             # in this case, R needs to be square
             R_shape = ray.get(ra.shape.remote(R))
-            eye_temp = ra.eye.remote(R_shape[1], R_shape[0],
-                                     dtype_name=result_dtype)
+            eye_temp = ra.eye.remote(
+                R_shape[1], R_shape[0], dtype_name=result_dtype)
             r_res.objectids[i, i] = ra.dot.remote(eye_temp, R)
         else:
             r_res.objectids[i, i] = R
@@ -220,10 +221,11 @@ def qr(a):
     for i in range(len(Ts))[::-1]:
         y_col_block = core.subblocks.remote(y_res, [], [i])
         q = core.subtract.remote(
-            q, core.dot.remote(
-                y_col_block,
+            q,
+            core.dot.remote(y_col_block,
                             core.dot.remote(
                                 Ts[i],
-                    core.dot.remote(core.transpose.remote(y_col_block), q))))
+                                core.dot.remote(
+                                    core.transpose.remote(y_col_block), q))))
 
     return ray.get(q), r_res

python/ray/experimental/array/remote/__init__.py

@@ -8,6 +8,8 @@ from .core import (zeros, zeros_like, ones, eye, dot, vstack, hstack, subarray,
                    copy, tril, triu, diag, transpose, add, subtract, sum,
                    shape, sum_list)
 
-__all__ = ["random", "linalg", "zeros", "zeros_like", "ones", "eye", "dot",
-           "vstack", "hstack", "subarray", "copy", "tril", "triu", "diag",
-           "transpose", "add", "subtract", "sum", "shape", "sum_list"]
+__all__ = [
+    "random", "linalg", "zeros", "zeros_like", "ones", "eye", "dot", "vstack",
+    "hstack", "subarray", "copy", "tril", "triu", "diag", "transpose", "add",
+    "subtract", "sum", "shape", "sum_list"
+]

python/ray/experimental/array/remote/linalg.py

@@ -5,10 +5,11 @@ from __future__ import print_function
 import numpy as np
 import ray
 
-__all__ = ["matrix_power", "solve", "tensorsolve", "tensorinv", "inv",
-           "cholesky", "eigvals", "eigvalsh", "pinv", "slogdet", "det",
-           "svd", "eig", "eigh", "lstsq", "norm", "qr", "cond", "matrix_rank",
-           "multi_dot"]
+__all__ = [
+    "matrix_power", "solve", "tensorsolve", "tensorinv", "inv", "cholesky",
+    "eigvals", "eigvalsh", "pinv", "slogdet", "det", "svd", "eig", "eigh",
+    "lstsq", "norm", "qr", "cond", "matrix_rank", "multi_dot"
+]
 
 
 @ray.remote

python/ray/experimental/state.py

@@ -59,6 +59,7 @@ class GlobalState(object):
     Attributes:
         redis_client: The redis client used to query the redis server.
     """
+
     def __init__(self):
         """Create a GlobalState object."""
         # The redis server storing metadata, such as function table, client
@@ -82,7 +83,9 @@ class GlobalState(object):
             raise Exception("The ray.global_state API cannot be used before "
                             "ray.init has been called.")
 
-    def _initialize_global_state(self, redis_ip_address, redis_port,
+    def _initialize_global_state(self,
+                                 redis_ip_address,
+                                 redis_port,
                                  timeout=20):
         """Initialize the GlobalState object by connecting to Redis.
 
@@ -97,8 +100,8 @@ class GlobalState(object):
             timeout: The maximum amount of time (in seconds) that we should
                 wait for the keys in Redis to be populated.
         """
-        self.redis_client = redis.StrictRedis(host=redis_ip_address,
-                                              port=redis_port)
+        self.redis_client = redis.StrictRedis(
+            host=redis_ip_address, port=redis_port)
 
         start_time = time.time()
 
@@ -118,8 +121,8 @@ class GlobalState(object):
                                 "{}.".format(num_redis_shards))
 
             # Attempt to get all of the Redis shards.
-            ip_address_ports = self.redis_client.lrange("RedisShards", start=0,
-                                                        end=-1)
+            ip_address_ports = self.redis_client.lrange(
+                "RedisShards", start=0, end=-1)
             if len(ip_address_ports) != num_redis_shards:
                 print("Waiting longer for RedisShards to be populated.")
                 time.sleep(1)
@@ -132,15 +135,15 @@ class GlobalState(object):
         if time.time() - start_time >= timeout:
             raise Exception("Timed out while attempting to initialize the "
                             "global state. num_redis_shards = {}, "
-                            "ip_address_ports = {}"
-                            .format(num_redis_shards, ip_address_ports))
+                            "ip_address_ports = {}".format(
+                                num_redis_shards, ip_address_ports))
 
         # Get the rest of the information.
         self.redis_clients = []
         for ip_address_port in ip_address_ports:
             shard_address, shard_port = ip_address_port.split(b":")
-            self.redis_clients.append(redis.StrictRedis(host=shard_address,
-                                                        port=shard_port))
+            self.redis_clients.append(
+                redis.StrictRedis(host=shard_address, port=shard_port))
 
     def _execute_command(self, key, *args):
         """Execute a Redis command on the appropriate Redis shard based on key.
@@ -152,8 +155,8 @@ class GlobalState(object):
         Returns:
             The value returned by the Redis command.
         """
-        client = self.redis_clients[key.redis_shard_hash() %
-                                    len(self.redis_clients)]
+        client = self.redis_clients[key.redis_shard_hash() % len(
+            self.redis_clients)]
         return client.execute_command(*args)
 
     def _keys(self, pattern):
@@ -189,8 +192,9 @@ class GlobalState(object):
                                                  "RAY.OBJECT_TABLE_LOOKUP",
                                                  object_id.id())
         if object_locations is not None:
-            manager_ids = [binary_to_hex(manager_id)
-                           for manager_id in object_locations]
+            manager_ids = [
+                binary_to_hex(manager_id) for manager_id in object_locations
+            ]
         else:
             manager_ids = None
 
@@ -199,11 +203,13 @@ class GlobalState(object):
         result_table_message = ResultTableReply.GetRootAsResultTableReply(
             result_table_response, 0)
 
-        result = {"ManagerIDs": manager_ids,
+        result = {
+            "ManagerIDs": manager_ids,
             "TaskID": binary_to_hex(result_table_message.TaskId()),
             "IsPut": bool(result_table_message.IsPut()),
             "DataSize": result_table_message.DataSize(),
-                  "Hash": binary_to_hex(result_table_message.Hash())}
+            "Hash": binary_to_hex(result_table_message.Hash())
+        }
 
         return result
 
@@ -227,9 +233,10 @@ class GlobalState(object):
             object_info_keys = self._keys(OBJECT_INFO_PREFIX + "*")
             object_location_keys = self._keys(OBJECT_LOCATION_PREFIX + "*")
             object_ids_binary = set(
-                [key[len(OBJECT_INFO_PREFIX):] for key in object_info_keys] +
-                [key[len(OBJECT_LOCATION_PREFIX):]
-                 for key in object_location_keys])
+                [key[len(OBJECT_INFO_PREFIX):] for key in object_info_keys] + [
+                    key[len(OBJECT_LOCATION_PREFIX):]
+                    for key in object_location_keys
+                ])
             results = {}
             for object_id_binary in object_ids_binary:
                 results[binary_to_object_id(object_id_binary)] = (
@@ -254,26 +261,37 @@ class GlobalState(object):
         if task_table_response is None:
             raise Exception("There is no entry for task ID {} in the task "
                             "table.".format(binary_to_hex(task_id.id())))
-        task_table_message = TaskReply.GetRootAsTaskReply(task_table_response,
-                                                          0)
+        task_table_message = TaskReply.GetRootAsTaskReply(
+            task_table_response, 0)
         task_spec = task_table_message.TaskSpec()
         task_spec = ray.local_scheduler.task_from_string(task_spec)
 
         task_spec_info = {
-            "DriverID": binary_to_hex(task_spec.driver_id().id()),
-            "TaskID": binary_to_hex(task_spec.task_id().id()),
-            "ParentTaskID": binary_to_hex(task_spec.parent_task_id().id()),
-            "ParentCounter": task_spec.parent_counter(),
-            "ActorID": binary_to_hex(task_spec.actor_id().id()),
+            "DriverID":
+            binary_to_hex(task_spec.driver_id().id()),
+            "TaskID":
+            binary_to_hex(task_spec.task_id().id()),
+            "ParentTaskID":
+            binary_to_hex(task_spec.parent_task_id().id()),
+            "ParentCounter":
+            task_spec.parent_counter(),
+            "ActorID":
+            binary_to_hex(task_spec.actor_id().id()),
             "ActorCreationID":
             binary_to_hex(task_spec.actor_creation_id().id()),
             "ActorCreationDummyObjectID":
             binary_to_hex(task_spec.actor_creation_dummy_object_id().id()),
-            "ActorCounter": task_spec.actor_counter(),
-            "FunctionID": binary_to_hex(task_spec.function_id().id()),
-            "Args": task_spec.arguments(),
-            "ReturnObjectIDs": task_spec.returns(),
-            "RequiredResources": task_spec.required_resources()}
+            "ActorCounter":
+            task_spec.actor_counter(),
+            "FunctionID":
+            binary_to_hex(task_spec.function_id().id()),
+            "Args":
+            task_spec.arguments(),
+            "ReturnObjectIDs":
+            task_spec.returns(),
+            "RequiredResources":
+            task_spec.required_resources()
+        }
 
         execution_dependencies_message = (
             TaskExecutionDependencies.GetRootAsTaskExecutionDependencies(
@@ -282,21 +300,27 @@ class GlobalState(object):
             ray.local_scheduler.ObjectID(
                 execution_dependencies_message.ExecutionDependencies(i))
             for i in range(
-                execution_dependencies_message.ExecutionDependenciesLength())]
+                execution_dependencies_message.ExecutionDependenciesLength())
+        ]
 
         # TODO(rkn): The return fields ExecutionDependenciesString and
         # ExecutionDependencies are redundant, so we should remove
         # ExecutionDependencies. However, it is currently used in monitor.py.
 
-        return {"State": task_table_message.State(),
-                "LocalSchedulerID": binary_to_hex(
-                    task_table_message.LocalSchedulerId()),
+        return {
+            "State":
+            task_table_message.State(),
+            "LocalSchedulerID":
+            binary_to_hex(task_table_message.LocalSchedulerId()),
             "ExecutionDependenciesString":
             task_table_message.ExecutionDependencies(),
-                "ExecutionDependencies": execution_dependencies,
+            "ExecutionDependencies":
+            execution_dependencies,
             "SpillbackCount":
             task_table_message.SpillbackCount(),
-                "TaskSpec": task_spec_info}
+            "TaskSpec":
+            task_spec_info
+        }
 
     def task_table(self, task_id=None):
         """Fetch and parse the task table information for one or more task IDs.
@@ -337,7 +361,8 @@ class GlobalState(object):
             function_info_parsed = {
                 "DriverID": binary_to_hex(info[b"driver_id"]),
                 "Module": decode(info[b"module"]),
-                "Name": decode(info[b"name"])}
+                "Name": decode(info[b"name"])
+            }
             results[binary_to_hex(info[b"function_id"])] = function_info_parsed
         return results
 
@@ -469,21 +494,17 @@ class GlobalState(object):
             if start is None and end is None:
                 if fwd:
                     event_list = self.redis_client.zrange(
-                        event_log_set,
-                        **params)
+                        event_log_set, **params)
                 else:
                     event_list = self.redis_client.zrevrange(
-                        event_log_set,
-                        **params)
+                        event_log_set, **params)
             else:
                 if fwd:
                     event_list = self.redis_client.zrangebyscore(
-                        event_log_set,
-                        **params)
+                        event_log_set, **params)
                 else:
                     event_list = self.redis_client.zrevrangebyscore(
-                        event_log_set,
-                        **params)
+                        event_log_set, **params)
 
             for (event, score) in event_list:
                 event_dict = json.loads(event.decode())
@@ -503,11 +524,11 @@ class GlobalState(object):
                         task_info[task_id]["get_task_start"] = event[0]
                     if event[1] == "ray:get_task" and event[2] == 2:
                         task_info[task_id]["get_task_end"] = event[0]
-                    if (event[1] == "ray:import_remote_function" and
-                            event[2] == 1):
+                    if (event[1] == "ray:import_remote_function"
+                            and event[2] == 1):
                         task_info[task_id]["import_remote_start"] = event[0]
-                    if (event[1] == "ray:import_remote_function" and
-                            event[2] == 2):
+                    if (event[1] == "ray:import_remote_function"
+                            and event[2] == 2):
                         task_info[task_id]["import_remote_end"] = event[0]
                     if event[1] == "ray:acquire_lock" and event[2] == 1:
                         task_info[task_id]["acquire_lock_start"] = event[0]
@@ -547,7 +568,6 @@ class GlobalState(object):
                             breakdowns=True,
                             task_dep=True,
                             obj_dep=True):
-
         """Dump task profiling information to a file.
 
         This information can be viewed as a timeline of profiling information
@@ -604,18 +624,20 @@ class GlobalState(object):
             # modify it in place since we will use the original values later.
             total_info = copy.copy(task_table[task_id]["TaskSpec"])
             total_info["Args"] = [
-                oid.hex() if isinstance(oid, ray.local_scheduler.ObjectID)
-                else oid for oid in task_t_info["TaskSpec"]["Args"]]
+                oid.hex()
+                if isinstance(oid, ray.local_scheduler.ObjectID) else oid
+                for oid in task_t_info["TaskSpec"]["Args"]
+            ]
             total_info["ReturnObjectIDs"] = [
-                oid.hex() for oid
-                in task_t_info["TaskSpec"]["ReturnObjectIDs"]]
+                oid.hex() for oid in task_t_info["TaskSpec"]["ReturnObjectIDs"]
+            ]
             total_info["LocalSchedulerID"] = task_t_info["LocalSchedulerID"]
-            total_info["get_arguments"] = (info["get_arguments_end"] -
-                                           info["get_arguments_start"])
-            total_info["execute"] = (info["execute_end"] -
-                                     info["execute_start"])
-            total_info["store_outputs"] = (info["store_outputs_end"] -
-                                           info["store_outputs_start"])
+            total_info["get_arguments"] = (
+                info["get_arguments_end"] - info["get_arguments_start"])
+            total_info["execute"] = (
+                info["execute_end"] - info["execute_start"])
+            total_info["store_outputs"] = (
+                info["store_outputs_end"] - info["store_outputs_start"])
             total_info["function_name"] = info["function_name"]
             total_info["worker_id"] = info["worker_id"]
 
@@ -627,49 +649,78 @@ class GlobalState(object):
             if breakdowns:
                 if "get_arguments_end" in info:
                     get_args_trace = {
-                        "cat": "get_arguments",
-                        "pid": "Node " + worker["node_ip_address"],
-                        "tid": info["worker_id"],
-                        "id": task_id,
-                        "ts": micros_rel(info["get_arguments_start"]),
-                        "ph": "X",
-                        "name": info["function_name"] + ":get_arguments",
-                        "args": total_info,
-                        "dur": micros(info["get_arguments_end"] -
+                        "cat":
+                        "get_arguments",
+                        "pid":
+                        "Node " + worker["node_ip_address"],
+                        "tid":
+                        info["worker_id"],
+                        "id":
+                        task_id,
+                        "ts":
+                        micros_rel(info["get_arguments_start"]),
+                        "ph":
+                        "X",
+                        "name":
+                        info["function_name"] + ":get_arguments",
+                        "args":
+                        total_info,
+                        "dur":
+                        micros(info["get_arguments_end"] -
                                info["get_arguments_start"]),
-                        "cname": "rail_idle"
+                        "cname":
+                        "rail_idle"
                     }
                     full_trace.append(get_args_trace)
 
                 if "store_outputs_end" in info:
                     outputs_trace = {
-                        "cat": "store_outputs",
-                        "pid": "Node " + worker["node_ip_address"],
-                        "tid": info["worker_id"],
-                        "id": task_id,
-                        "ts": micros_rel(info["store_outputs_start"]),
-                        "ph": "X",
-                        "name": info["function_name"] + ":store_outputs",
-                        "args": total_info,
-                        "dur": micros(info["store_outputs_end"] -
+                        "cat":
+                        "store_outputs",
+                        "pid":
+                        "Node " + worker["node_ip_address"],
+                        "tid":
+                        info["worker_id"],
+                        "id":
+                        task_id,
+                        "ts":
+                        micros_rel(info["store_outputs_start"]),
+                        "ph":
+                        "X",
+                        "name":
+                        info["function_name"] + ":store_outputs",
+                        "args":
+                        total_info,
+                        "dur":
+                        micros(info["store_outputs_end"] -
                                info["store_outputs_start"]),
-                        "cname": "thread_state_runnable"
+                        "cname":
+                        "thread_state_runnable"
                     }
                     full_trace.append(outputs_trace)
 
                 if "execute_end" in info:
                     execute_trace = {
-                        "cat": "execute",
-                        "pid": "Node " + worker["node_ip_address"],
-                        "tid": info["worker_id"],
-                        "id": task_id,
-                        "ts": micros_rel(info["execute_start"]),
-                        "ph": "X",
-                        "name": info["function_name"] + ":execute",
-                        "args": total_info,
-                        "dur": micros(info["execute_end"] -
-                                      info["execute_start"]),
-                        "cname": "rail_animation"
+                        "cat":
+                        "execute",
+                        "pid":
+                        "Node " + worker["node_ip_address"],
+                        "tid":
+                        info["worker_id"],
+                        "id":
+                        task_id,
+                        "ts":
+                        micros_rel(info["execute_start"]),
+                        "ph":
+                        "X",
+                        "name":
+                        info["function_name"] + ":execute",
+                        "args":
+                        total_info,
+                        "dur":
+                        micros(info["execute_end"] - info["execute_start"]),
+                        "cname":
+                        "rail_animation"
                     }
                     full_trace.append(execute_trace)
 
@@ -680,15 +731,20 @@ class GlobalState(object):
                     parent_profile = task_info.get(
                         task_table[task_id]["TaskSpec"]["ParentTaskID"])
                     parent = {
-                        "cat": "submit_task",
-                        "pid": "Node " + parent_worker["node_ip_address"],
-                        "tid": parent_info["worker_id"],
-                        "ts": micros_rel(
-                            parent_profile and
-                            parent_profile["get_arguments_start"] or
-                            start_time),
-                        "ph": "s",
-                        "name": "SubmitTask",
+                        "cat":
+                        "submit_task",
+                        "pid":
+                        "Node " + parent_worker["node_ip_address"],
+                        "tid":
+                        parent_info["worker_id"],
+                        "ts":
+                        micros_rel(parent_profile
+                                   and parent_profile["get_arguments_start"]
+                                   or start_time),
+                        "ph":
+                        "s",
+                        "name":
+                        "SubmitTask",
                         "args": {},
                         "id": (parent_info["worker_id"] +
                                str(micros(min(parent_times))))
@@ -696,32 +752,50 @@ class GlobalState(object):
                     full_trace.append(parent)
 
                     task_trace = {
-                        "cat": "submit_task",
-                        "pid": "Node " + worker["node_ip_address"],
-                        "tid": info["worker_id"],
-                        "ts": micros_rel(info["get_arguments_start"]),
-                        "ph": "f",
-                        "name": "SubmitTask",
+                        "cat":
+                        "submit_task",
+                        "pid":
+                        "Node " + worker["node_ip_address"],
+                        "tid":
+                        info["worker_id"],
+                        "ts":
+                        micros_rel(info["get_arguments_start"]),
+                        "ph":
+                        "f",
+                        "name":
+                        "SubmitTask",
                         "args": {},
-                        "id": (info["worker_id"] +
-                               str(micros(min(parent_times)))),
-                        "bp": "e",
-                        "cname": "olive"
+                        "id":
+                        (info["worker_id"] + str(micros(min(parent_times)))),
+                        "bp":
+                        "e",
+                        "cname":
+                        "olive"
                     }
                     full_trace.append(task_trace)
 
                 task = {
-                    "cat": "task",
-                    "pid": "Node " + worker["node_ip_address"],
-                    "tid": info["worker_id"],
-                    "id": task_id,
-                    "ts": micros_rel(info["get_arguments_start"]),
-                    "ph": "X",
-                    "name": info["function_name"],
-                    "args": total_info,
-                    "dur": micros(info["store_outputs_end"] -
+                    "cat":
+                    "task",
+                    "pid":
+                    "Node " + worker["node_ip_address"],
+                    "tid":
+                    info["worker_id"],
+                    "id":
+                    task_id,
+                    "ts":
+                    micros_rel(info["get_arguments_start"]),
+                    "ph":
+                    "X",
+                    "name":
+                    info["function_name"],
+                    "args":
+                    total_info,
+                    "dur":
+                    micros(info["store_outputs_end"] -
                            info["get_arguments_start"]),
-                    "cname": "thread_state_runnable"
+                    "cname":
+                    "thread_state_runnable"
                 }
                 full_trace.append(task)
 
@@ -732,15 +806,20 @@ class GlobalState(object):
                     parent_profile = task_info.get(
                         task_table[task_id]["TaskSpec"]["ParentTaskID"])
                     parent = {
-                        "cat": "submit_task",
-                        "pid": "Node " + parent_worker["node_ip_address"],
-                        "tid": parent_info["worker_id"],
-                        "ts": micros_rel(
-                            parent_profile and
-                            parent_profile["get_arguments_start"] or
-                            start_time),
-                        "ph": "s",
-                        "name": "SubmitTask",
+                        "cat":
+                        "submit_task",
+                        "pid":
+                        "Node " + parent_worker["node_ip_address"],
+                        "tid":
+                        parent_info["worker_id"],
+                        "ts":
+                        micros_rel(parent_profile
+                                   and parent_profile["get_arguments_start"]
+                                   or start_time),
+                        "ph":
+                        "s",
+                        "name":
+                        "SubmitTask",
                         "args": {},
                         "id": (parent_info["worker_id"] +
                                str(micros(min(parent_times))))
@@ -748,16 +827,23 @@ class GlobalState(object):
                     full_trace.append(parent)
 
                     task_trace = {
-                        "cat": "submit_task",
-                        "pid": "Node " + worker["node_ip_address"],
-                        "tid": info["worker_id"],
-                        "ts": micros_rel(info["get_arguments_start"]),
-                        "ph": "f",
-                        "name": "SubmitTask",
+                        "cat":
+                        "submit_task",
+                        "pid":
+                        "Node " + worker["node_ip_address"],
+                        "tid":
+                        info["worker_id"],
+                        "ts":
+                        micros_rel(info["get_arguments_start"]),
+                        "ph":
+                        "f",
+                        "name":
+                        "SubmitTask",
                         "args": {},
-                        "id": (info["worker_id"] +
-                               str(micros(min(parent_times)))),
-                        "bp": "e"
+                        "id":
+                        (info["worker_id"] + str(micros(min(parent_times)))),
+                        "bp":
+                        "e"
                     }
                     full_trace.append(task_trace)
 
@@ -775,8 +861,8 @@ class GlobalState(object):
                             seen_obj[arg] += 1
                             owner_task = self._object_table(arg)["TaskID"]
                             if owner_task in task_info:
-                                owner_worker = (workers[
-                                    task_info[owner_task]["worker_id"]])
+                                owner_worker = (workers[task_info[owner_task][
+                                    "worker_id"]])
                                 # Adding/subtracting 2 to the time associated
                                 # with the beginning/ending of the flow event
                                 # is necessary to make the flow events show up
@@ -790,18 +876,26 @@ class GlobalState(object):
                                 # duration event that it's associated with, and
                                 # the flow event therefore always gets drawn.
                                 owner = {
-                                    "cat": "obj_dependency",
+                                    "cat":
+                                    "obj_dependency",
                                     "pid": ("Node " +
                                             owner_worker["node_ip_address"]),
-                                    "tid": task_info[owner_task]["worker_id"],
-                                    "ts": micros_rel(task_info[
-                                        owner_task]["store_outputs_end"]) - 2,
-                                    "ph": "s",
-                                    "name": "ObjectDependency",
+                                    "tid":
+                                    task_info[owner_task]["worker_id"],
+                                    "ts":
+                                    micros_rel(task_info[owner_task]
+                                               ["store_outputs_end"]) - 2,
+                                    "ph":
+                                    "s",
+                                    "name":
+                                    "ObjectDependency",
                                     "args": {},
-                                    "bp": "e",
-                                    "cname": "cq_build_attempt_failed",
-                                    "id": "obj" + str(arg) + str(seen_obj[arg])
+                                    "bp":
+                                    "e",
+                                    "cname":
+                                    "cq_build_attempt_failed",
+                                    "id":
+                                    "obj" + str(arg) + str(seen_obj[arg])
                                 }
                                 full_trace.append(owner)
 
@@ -809,8 +903,8 @@ class GlobalState(object):
                                 "cat": "obj_dependency",
                                 "pid": "Node " + worker["node_ip_address"],
                                 "tid": info["worker_id"],
-                                "ts": micros_rel(
-                                    info["get_arguments_start"]) + 2,
+                                "ts":
+                                micros_rel(info["get_arguments_start"]) + 2,
                                 "ph": "f",
                                 "name": "ObjectDependency",
                                 "args": {},
@@ -852,14 +946,10 @@ class GlobalState(object):
         """
 
         keys = [
-            "acquire_lock_start",
-            "acquire_lock_end",
-            "get_arguments_start",
-            "get_arguments_end",
-            "execute_start",
-            "execute_end",
-            "store_outputs_start",
-            "store_outputs_end"]
+            "acquire_lock_start", "acquire_lock_end", "get_arguments_start",
+            "get_arguments_end", "execute_start", "execute_end",
+            "store_outputs_start", "store_outputs_end"
+        ]
 
         latest_timestamp = 0
         for key in keys:
@@ -877,8 +967,8 @@ class GlobalState(object):
         local_schedulers = []
         for ip_address, client_list in clients.items():
             for client in client_list:
-                if (client["ClientType"] == "local_scheduler" and
-                        not client["Deleted"]):
+                if (client["ClientType"] == "local_scheduler"
+                        and not client["Deleted"]):
                     local_schedulers.append(client)
         return local_schedulers
 
@@ -893,8 +983,7 @@ class GlobalState(object):
 
             workers_data[worker_id] = {
                 "local_scheduler_socket":
-                    (worker_info[b"local_scheduler_socket"]
-                     .decode("ascii")),
+                (worker_info[b"local_scheduler_socket"].decode("ascii")),
                 "node_ip_address": (worker_info[b"node_ip_address"]
                                     .decode("ascii")),
                 "plasma_manager_socket": (worker_info[b"plasma_manager_socket"]
@@ -923,7 +1012,8 @@ class GlobalState(object):
                 "local_scheduler_id":
                 binary_to_hex(info[b"local_scheduler_id"]),
                 "num_gpus": int(info[b"num_gpus"]),
-                "removed": decode(info[b"removed"]) == "True"}
+                "removed": decode(info[b"removed"]) == "True"
+            }
         return actor_info
 
     def _job_length(self):
@@ -932,21 +1022,16 @@ class GlobalState(object):
         overall_largest = 0
         num_tasks = 0
         for event_log_set in event_log_sets:
-            fwd_range = self.redis_client.zrange(event_log_set,
-                                                 start=0,
-                                                 end=0,
-                                                 withscores=True)
+            fwd_range = self.redis_client.zrange(
+                event_log_set, start=0, end=0, withscores=True)
             overall_smallest = min(overall_smallest, fwd_range[0][1])
 
-            rev_range = self.redis_client.zrevrange(event_log_set,
-                                                    start=0,
-                                                    end=0,
-                                                    withscores=True)
+            rev_range = self.redis_client.zrevrange(
+                event_log_set, start=0, end=0, withscores=True)
             overall_largest = max(overall_largest, rev_range[0][1])
 
-            num_tasks += self.redis_client.zcount(event_log_set,
-                                                  min=0,
-                                                  max=time.time())
+            num_tasks += self.redis_client.zcount(
+                event_log_set, min=0, max=time.time())
         if num_tasks is 0:
             return 0, 0, 0
         return overall_smallest, overall_largest, num_tasks
@@ -966,8 +1051,10 @@ class GlobalState(object):
 
         for local_scheduler in local_schedulers:
             for key, value in local_scheduler.items():
-                if key not in ["ClientType", "Deleted", "DBClientID",
-                               "AuxAddress", "LocalSchedulerSocketName"]:
+                if key not in [
+                        "ClientType", "Deleted", "DBClientID", "AuxAddress",
+                        "LocalSchedulerSocketName"
+                ]:
                     resources[key] += value
 
         return dict(resources)

python/ray/experimental/tfutils.py

@@ -27,6 +27,7 @@ class TensorFlowVariables(object):
         placeholders (Dict[str, tf.placeholders]): Placeholders for weights.
         assignment_nodes (Dict[str, tf.Tensor]): Nodes that assign weights.
     """
+
     def __init__(self, loss, sess=None, input_variables=None):
         """Creates TensorFlowVariables containing extracted variables.
 
@@ -74,8 +75,10 @@ class TensorFlowVariables(object):
             if "Variable" in tf_obj.node_def.op:
                 variable_names.append(tf_obj.node_def.name)
         self.variables = OrderedDict()
-        variable_list = [v for v in tf.global_variables()
-                         if v.op.node_def.name in variable_names]
+        variable_list = [
+            v for v in tf.global_variables()
+            if v.op.node_def.name in variable_names
+        ]
         if input_variables is not None:
             variable_list += input_variables
         for v in variable_list:
@@ -86,7 +89,8 @@ class TensorFlowVariables(object):
 
         # Create new placeholders to put in custom weights.
         for k, var in self.variables.items():
-            self.placeholders[k] = tf.placeholder(var.value().dtype,
+            self.placeholders[k] = tf.placeholder(
+                var.value().dtype,
                 var.get_shape().as_list(),
                 name="Placeholder_" + k)
             self.assignment_nodes[k] = var.assign(self.placeholders[k])
@@ -105,8 +109,9 @@ class TensorFlowVariables(object):
         Returns:
             The length of all flattened variables concatenated.
         """
-        return sum([np.prod(v.get_shape().as_list())
-                   for v in self.variables.values()])
+        return sum([
+            np.prod(v.get_shape().as_list()) for v in self.variables.values()
+        ])
 
     def _check_sess(self):
         """Checks if the session is set, and if not throw an error message."""
@@ -122,8 +127,10 @@ class TensorFlowVariables(object):
             1D Array containing the flattened weights.
         """
         self._check_sess()
-        return np.concatenate([v.eval(session=self.sess).flatten()
-                               for v in self.variables.values()])
+        return np.concatenate([
+            v.eval(session=self.sess).flatten()
+            for v in self.variables.values()
+        ])
 
     def set_flat(self, new_weights):
         """Sets the weights to new_weights, converting from a flat array.
@@ -138,9 +145,11 @@ class TensorFlowVariables(object):
         self._check_sess()
         shapes = [v.get_shape().as_list() for v in self.variables.values()]
         arrays = unflatten(new_weights, shapes)
-        placeholders = [self.placeholders[k] for k, v
-                        in self.variables.items()]
-        self.sess.run(list(self.assignment_nodes.values()),
+        placeholders = [
+            self.placeholders[k] for k, v in self.variables.items()
+        ]
+        self.sess.run(
+            list(self.assignment_nodes.values()),
             feed_dict=dict(zip(placeholders, arrays)))
 
     def get_weights(self):
@@ -150,8 +159,10 @@ class TensorFlowVariables(object):
             Dictionary mapping variable names to their weights.
         """
         self._check_sess()
-        return {k: v.eval(session=self.sess) for k, v
-                in self.variables.items()}
+        return {
+            k: v.eval(session=self.sess)
+            for k, v in self.variables.items()
+        }
 
     def set_weights(self, new_weights):
         """Sets the weights to new_weights.
@@ -165,15 +176,19 @@ class TensorFlowVariables(object):
                 weights.
         """
         self._check_sess()
-        assign_list = [self.assignment_nodes[name]
-                       for name in new_weights.keys()
-                       if name in self.assignment_nodes]
+        assign_list = [
+            self.assignment_nodes[name] for name in new_weights.keys()
+            if name in self.assignment_nodes
+        ]
         assert assign_list, ("No variables in the input matched those in the "
                              "network. Possible cause: Two networks were "
                              "defined in the same TensorFlow graph. To fix "
                              "this, place each network definition in its own "
                              "tf.Graph.")
-        self.sess.run(assign_list,
-                      feed_dict={self.placeholders[name]: value
+        self.sess.run(
+            assign_list,
+            feed_dict={
+                self.placeholders[name]: value
                 for (name, value) in new_weights.items()
-                                 if name in self.placeholders})
+                if name in self.placeholders
+            })

python/ray/experimental/ui.py

@@ -29,9 +29,9 @@ class _EventRecursionContextManager(object):
 total_time_value = "% total time"
 total_tasks_value = "% total tasks"
 
-
 # Function that returns instances of sliders and handles associated events.
 
+
 def get_sliders(update):
     # Start_box value indicates the desired start point of queried window.
     start_box = widgets.FloatText(
@@ -60,18 +60,14 @@ def get_sliders(update):
 
     # Indicates the number of tasks that the user wants to be returned. Is
     # disabled when the breakdown_opt value is set to total_time_value.
-    num_tasks_box = widgets.IntText(
-        description="Num Tasks:",
-        disabled=False
-    )
+    num_tasks_box = widgets.IntText(description="Num Tasks:", disabled=False)
 
     # Dropdown bar that lets the user choose between modifying % of total
     # time or total number of tasks.
     breakdown_opt = widgets.Dropdown(
         options=[total_time_value, total_tasks_value],
         value=total_tasks_value,
-        description="Selection Options:"
-    )
+        description="Selection Options:")
 
     # Display box for layout.
     total_time_box = widgets.VBox([start_box, end_box])
@@ -105,9 +101,9 @@ def get_sliders(update):
                 if event == INIT_EVENT:
                     if breakdown_opt.value == total_tasks_value:
                         num_tasks_box.value = -min(10000, num_tasks)
-                        range_slider.value = (int(100 -
-                                              (100. * -num_tasks_box.value) /
-                                              num_tasks), 100)
+                        range_slider.value = (int(
+                            100 - (100. * -num_tasks_box.value) / num_tasks),
+                                              100)
                     else:
                         low, high = map(lambda x: x / 100., range_slider.value)
                         start_box.value = round(diff * low, 2)
@@ -120,8 +116,8 @@ def get_sliders(update):
                     elif start_box.value < 0:
                         start_box.value = 0
                     low, high = range_slider.value
-                    range_slider.value = (int((start_box.value * 100.) /
-                                          diff), high)
+                    range_slider.value = (int((start_box.value * 100.) / diff),
+                                          high)
 
                 # Event was triggered by a change in the end_box value.
                 elif event["owner"] == end_box:
@@ -130,8 +126,8 @@ def get_sliders(update):
                     elif end_box.value > diff:
                         end_box.value = diff
                     low, high = range_slider.value
-                    range_slider.value = (low, int((end_box.value * 100.) /
-                                          diff))
+                    range_slider.value = (low,
+                                          int((end_box.value * 100.) / diff))
 
                 # Event was triggered by a change in the breakdown options
                 # toggle.
@@ -145,9 +141,9 @@ def get_sliders(update):
                         # Make CSS display go back to the default settings.
                         num_tasks_box.layout.display = None
                         num_tasks_box.value = min(10000, num_tasks)
-                        range_slider.value = (int(100 -
-                                              (100. * num_tasks_box.value) /
-                                              num_tasks), 100)
+                        range_slider.value = (int(
+                            100 - (100. * num_tasks_box.value) / num_tasks),
+                                              100)
                     else:
                         start_box.disabled = False
                         end_box.disabled = False
@@ -156,10 +152,9 @@ def get_sliders(update):
                         # Make CSS display go back to the default settings.
                         total_time_box.layout.display = None
                         num_tasks_box.layout.display = 'none'
-                        range_slider.value = (int((start_box.value * 100.) /
-                                              diff),
-                                              int((end_box.value * 100.) /
-                                              diff))
+                        range_slider.value = (
+                            int((start_box.value * 100.) / diff),
+                            int((end_box.value * 100.) / diff))
 
                 # Event was triggered by a change in the range_slider
                 # value.
@@ -170,8 +165,8 @@ def get_sliders(update):
                         new_low, new_high = event["new"]
                         if old_low != new_low:
                             range_slider.value = (new_low, 100)
-                            num_tasks_box.value = (-(100. - new_low) /
-                                                   100. * num_tasks)
+                            num_tasks_box.value = (
+                                -(100. - new_low) / 100. * num_tasks)
                         else:
                             range_slider.value = (0, new_high)
                             num_tasks_box.value = new_high / 100. * num_tasks
@@ -183,14 +178,12 @@ def get_sliders(update):
                 # value.
                 elif event["owner"] == num_tasks_box:
                     if num_tasks_box.value > 0:
-                        range_slider.value = (0, int(100 *
-                                              float(num_tasks_box.value) /
-                                              num_tasks))
+                        range_slider.value = (
+                            0, int(
+                                100 * float(num_tasks_box.value) / num_tasks))
                     elif num_tasks_box.value < 0:
-                        range_slider.value = (100 +
-                                              int(100 *
-                                                  float(num_tasks_box.value) /
-                                                  num_tasks), 100)
+                        range_slider.value = (100 + int(
+                            100 * float(num_tasks_box.value) / num_tasks), 100)
 
                 if not update:
                     return
@@ -205,22 +198,19 @@ def get_sliders(update):
                 # box values.
                 # (Querying based on the % total amount of time.)
                 if breakdown_opt.value == total_time_value:
-                    tasks = _truncated_task_profiles(start=(smallest +
-                                                     diff * low),
-                                                     end=(smallest +
-                                                     diff * high))
+                    tasks = _truncated_task_profiles(
+                        start=(smallest + diff * low),
+                        end=(smallest + diff * high))
 
                 # (Querying based on % of total number of tasks that were
                 # run.)
                 elif breakdown_opt.value == total_tasks_value:
                     if range_slider.value[0] == 0:
-                        tasks = _truncated_task_profiles(num_tasks=(int(
-                                                         num_tasks * high)),
-                                                         fwd=True)
+                        tasks = _truncated_task_profiles(
+                            num_tasks=(int(num_tasks * high)), fwd=True)
                     else:
-                        tasks = _truncated_task_profiles(num_tasks=(int(
-                                                         num_tasks *
-                                                         (high - low))),
+                        tasks = _truncated_task_profiles(
+                            num_tasks=(int(num_tasks * (high - low))),
                             fwd=False)
 
                 update(smallest, largest, num_tasks, tasks)
@@ -237,8 +227,8 @@ def get_sliders(update):
     update_wrapper(INIT_EVENT)
 
     # Display sliders and search boxes
-    display(breakdown_opt, widgets.HBox([range_slider, total_time_box,
-                                         num_tasks_box]))
+    display(breakdown_opt,
+            widgets.HBox([range_slider, total_time_box, num_tasks_box]))
 
     # Return the sliders and text boxes
     return start_box, end_box, range_slider, breakdown_opt
@@ -249,8 +239,7 @@ def object_search_bar():
         value="",
         placeholder="Object ID",
         description="Search for an object:",
-        disabled=False
-        )
+        disabled=False)
     display(object_search)
 
     def handle_submit(sender):
@@ -265,8 +254,7 @@ def task_search_bar():
         value="",
         placeholder="Task ID",
         description="Search for a task:",
-        disabled=False
-        )
+        disabled=False)
     display(task_search)
 
     def handle_submit(sender):
@@ -284,12 +272,10 @@ MAX_TASKS_TO_VISUALIZE = 10000
 def _truncated_task_profiles(start=None, end=None, num_tasks=None, fwd=True):
     if num_tasks is None:
         num_tasks = MAX_TASKS_TO_VISUALIZE
-        print(
-            "Warning: at most {} tasks will be fetched within this "
+        print("Warning: at most {} tasks will be fetched within this "
               "time range.".format(MAX_TASKS_TO_VISUALIZE))
     elif num_tasks > MAX_TASKS_TO_VISUALIZE:
-        print(
-            "Warning: too many tasks to visualize, "
+        print("Warning: too many tasks to visualize, "
               "fetching only the first {} of {}.".format(
                   MAX_TASKS_TO_VISUALIZE, num_tasks))
         num_tasks = MAX_TASKS_TO_VISUALIZE
@@ -299,9 +285,8 @@ def _truncated_task_profiles(start=None, end=None, num_tasks=None, fwd=True):
 # Helper function that guarantees unique and writeable temp files.
 # Prevents clashes in task trace files when multiple notebooks are running.
 def _get_temp_file_path(**kwargs):
-    temp_file = tempfile.NamedTemporaryFile(delete=False,
-                                            dir=os.getcwd(),
-                                            **kwargs)
+    temp_file = tempfile.NamedTemporaryFile(
+        delete=False, dir=os.getcwd(), **kwargs)
     temp_file_path = temp_file.name
     temp_file.close()
     return os.path.relpath(temp_file_path)
@@ -319,22 +304,16 @@ def task_timeline():
         disabled=False,
     )
     obj_dep = widgets.Checkbox(
-        value=True,
-        disabled=False,
-        layout=widgets.Layout(width='20px')
-    )
+        value=True, disabled=False, layout=widgets.Layout(width='20px'))
     task_dep = widgets.Checkbox(
-        value=True,
-        disabled=False,
-        layout=widgets.Layout(width='20px')
-    )
+        value=True, disabled=False, layout=widgets.Layout(width='20px'))
     # Labels to bypass width limitation for descriptions.
-    label_tasks = widgets.Label(value='Task submissions',
-                                layout=widgets.Layout(width='110px'))
-    label_objects = widgets.Label(value='Object dependencies',
-                                  layout=widgets.Layout(width='130px'))
-    label_options = widgets.Label(value='View options:',
-                                  layout=widgets.Layout(width='100px'))
+    label_tasks = widgets.Label(
+        value='Task submissions', layout=widgets.Layout(width='110px'))
+    label_objects = widgets.Label(
+        value='Object dependencies', layout=widgets.Layout(width='130px'))
+    label_options = widgets.Label(
+        value='View options:', layout=widgets.Layout(width='100px'))
     start_box, end_box, range_slider, time_opt = get_sliders(False)
     display(widgets.HBox([task_dep, label_tasks, obj_dep, label_objects]))
     display(widgets.HBox([label_options, breakdown_opt]))
@@ -344,7 +323,8 @@ def task_timeline():
     # current working directory if it is not present.
     if not os.path.exists("trace_viewer_full.html"):
         shutil.copy(
-            os.path.join(os.path.dirname(os.path.abspath(__file__)),
+            os.path.join(
+                os.path.dirname(os.path.abspath(__file__)),
                 "../core/src/catapult_files/trace_viewer_full.html"),
             "trace_viewer_full.html")
 
@@ -357,8 +337,8 @@ def task_timeline():
         elif breakdown_opt.value == breakdown_task:
             breakdown = True
         else:
-            raise ValueError(
-                "Unexpected breakdown value '{}'".format(breakdown_opt.value))
+            raise ValueError("Unexpected breakdown value '{}'".format(
+                breakdown_opt.value))
 
         low, high = map(lambda x: x / 100., range_slider.value)
 
@@ -366,26 +346,24 @@ def task_timeline():
         diff = largest - smallest
 
         if time_opt.value == total_time_value:
-            tasks = _truncated_task_profiles(start=smallest + diff * low,
-                                             end=smallest + diff * high)
+            tasks = _truncated_task_profiles(
+                start=smallest + diff * low, end=smallest + diff * high)
         elif time_opt.value == total_tasks_value:
             if range_slider.value[0] == 0:
-                tasks = _truncated_task_profiles(num_tasks=int(
-                                                 num_tasks * high),
-                                                 fwd=True)
+                tasks = _truncated_task_profiles(
+                    num_tasks=int(num_tasks * high), fwd=True)
             else:
-                tasks = _truncated_task_profiles(num_tasks=int(
-                                                 num_tasks * (high - low)),
-                                                 fwd=False)
+                tasks = _truncated_task_profiles(
+                    num_tasks=int(num_tasks * (high - low)), fwd=False)
         else:
             raise ValueError("Unexpected time value '{}'".format(
                 time_opt.value))
         # Write trace to a JSON file
         print("Collected profiles for {} tasks.".format(len(tasks)))
-        print(
-            "Dumping task profile data to {}, "
+        print("Dumping task profile data to {}, "
               "this might take a while...".format(json_tmp))
-        ray.global_state.dump_catapult_trace(json_tmp,
+        ray.global_state.dump_catapult_trace(
+            json_tmp,
             tasks,
             breakdowns=breakdown,
             obj_dep=obj_dep.value,
@@ -415,8 +393,7 @@ def task_timeline():
 
         # Display the task trace within the Jupyter notebook
         clear_output(wait=True)
-        print(
-            "To view fullscreen, open chrome://tracing in Google Chrome "
+        print("To view fullscreen, open chrome://tracing in Google Chrome "
               "and load `{}`".format(json_tmp))
         display(IFrame(html_file_path, 900, 800))
 
@@ -432,36 +409,41 @@ def task_completion_time_distribution():
     output_notebook(resources=CDN)
 
     # Create the Bokeh plot
-    p = figure(title="Task Completion Time Distribution",
+    p = figure(
+        title="Task Completion Time Distribution",
         tools=["save", "hover", "wheel_zoom", "box_zoom", "pan"],
         background_fill_color="#FFFFFF",
         x_range=(0, 1),
         y_range=(0, 1))
 
     # Create the data source that the plot pulls from
-    source = ColumnDataSource(data={
-        "top": [],
-        "left": [],
-        "right": []
-    })
+    source = ColumnDataSource(data={"top": [], "left": [], "right": []})
 
     # Plot the histogram rectangles
-    p.quad(top="top", bottom=0, left="left", right="right", source=source,
-           fill_color="#B3B3B3", line_color="#033649")
+    p.quad(
+        top="top",
+        bottom=0,
+        left="left",
+        right="right",
+        source=source,
+        fill_color="#B3B3B3",
+        line_color="#033649")
 
     # Label the plot axes
     p.xaxis.axis_label = "Duration in seconds"
     p.yaxis.axis_label = "Number of tasks"
 
-    handle = show(gridplot(p, ncols=1,
+    handle = show(
+        gridplot(
+            p,
+            ncols=1,
             plot_width=500,
             plot_height=500,
-                           toolbar_location="below"), notebook_handle=True)
+            toolbar_location="below"),
+        notebook_handle=True)
 
     # Function to update the plot
-    def task_completion_time_update(abs_earliest,
-                                    abs_latest,
-                                    abs_num_tasks,
+    def task_completion_time_update(abs_earliest, abs_latest, abs_num_tasks,
                                     tasks):
         if len(tasks) == 0:
             return
@@ -469,8 +451,8 @@ def task_completion_time_distribution():
         # Create the distribution to plot
         distr = []
         for task_id, data in tasks.items():
-            distr.append(data["store_outputs_end"] -
-                         data["get_arguments_start"])
+            distr.append(
+                data["store_outputs_end"] - data["get_arguments_start"])
 
         # Create a histogram from the distribution
         top, bin_edges = np.histogram(distr, bins="auto")
@@ -480,8 +462,8 @@ def task_completion_time_distribution():
         source.data = {"top": top, "left": left, "right": right}
 
         # Set the x and y ranges
-        x_range = (min(left) if len(left) else 0,
-                   max(right) if len(right) else 1)
+        x_range = (min(left) if len(left) else 0, max(right)
+                   if len(right) else 1)
         y_range = (0, max(top) + 1 if len(top) else 1)
 
         x_range = helpers._get_range(x_range)
@@ -517,8 +499,7 @@ def compute_utilizations(abs_earliest,
         latest_time = 0
         for task_id, data in tasks.items():
             latest_time = max((latest_time, data["store_outputs_end"]))
-            earliest_time = min((earliest_time,
-                                 data["get_arguments_start"]))
+            earliest_time = min((earliest_time, data["get_arguments_start"]))
 
     # Add some epsilon to latest_time to ensure that the end time of the
     # last task falls __within__ a bucket, and not on the edge
@@ -533,37 +514,37 @@ def compute_utilizations(abs_earliest,
         task_start_time = data["get_arguments_start"]
         task_end_time = data["store_outputs_end"]
 
-        start_bucket = int((task_start_time - earliest_time) /
-                           bucket_time_length)
-        end_bucket = int((task_end_time - earliest_time) /
-                         bucket_time_length)
+        start_bucket = int(
+            (task_start_time - earliest_time) / bucket_time_length)
+        end_bucket = int((task_end_time - earliest_time) / bucket_time_length)
         # Walk over each time bucket that this task intersects, adding the
         # amount of time that the task intersects within each bucket
         for bucket_idx in range(start_bucket, end_bucket + 1):
-            bucket_start_time = ((earliest_time + bucket_idx) *
-                                 bucket_time_length)
-            bucket_end_time = ((earliest_time + (bucket_idx + 1)) *
-                               bucket_time_length)
+            bucket_start_time = ((
+                earliest_time + bucket_idx) * bucket_time_length)
+            bucket_end_time = ((earliest_time +
+                                (bucket_idx + 1)) * bucket_time_length)
 
             task_start_time_within_bucket = max(task_start_time,
                                                 bucket_start_time)
-            task_end_time_within_bucket = min(task_end_time,
-                                              bucket_end_time)
-            task_cpu_time_within_bucket = (task_end_time_within_bucket -
-                                           task_start_time_within_bucket)
+            task_end_time_within_bucket = min(task_end_time, bucket_end_time)
+            task_cpu_time_within_bucket = (
+                task_end_time_within_bucket - task_start_time_within_bucket)
 
             if bucket_idx > -1 and bucket_idx < num_buckets:
                 cpu_time[bucket_idx] += task_cpu_time_within_bucket
 
     # Cpu_utilization is the average cpu utilization of the bucket, which
     # is just cpu_time divided by bucket_time_length.
-    cpu_utilization = list(map(lambda x: x / float(bucket_time_length),
-                               cpu_time))
+    cpu_utilization = list(
+        map(lambda x: x / float(bucket_time_length), cpu_time))
 
     # Generate histogram bucket edges. Subtract out abs_earliest to get
     # relative time.
-    all_edges = [earliest_time - abs_earliest + i * bucket_time_length
-                 for i in range(num_buckets + 1)]
+    all_edges = [
+        earliest_time - abs_earliest + i * bucket_time_length
+        for i in range(num_buckets + 1)
+    ]
     # Left edges are all but the rightmost edge, right edges are all but
     # the leftmost edge.
     left_edges = all_edges[:-1]
@@ -591,22 +572,20 @@ def cpu_usage():
     # Update the plot based on the sliders
     def plot_utilization():
         # Create the Bokeh plot
-        time_series_fig = figure(title="CPU Utilization",
-                                 tools=["save", "hover", "wheel_zoom",
-                                        "box_zoom", "pan"],
+        time_series_fig = figure(
+            title="CPU Utilization",
+            tools=["save", "hover", "wheel_zoom", "box_zoom", "pan"],
             background_fill_color="#FFFFFF",
             x_range=[0, 1],
             y_range=[0, 1])
 
         # Create the data source that the plot will pull from
-        time_series_source = ColumnDataSource(data=dict(
-            left=[],
-            right=[],
-            top=[]
-        ))
+        time_series_source = ColumnDataSource(
+            data=dict(left=[], right=[], top=[]))
 
         # Plot the rectangles representing the distribution
-        time_series_fig.quad(left="left",
+        time_series_fig.quad(
+            left="left",
             right="right",
             top="top",
             bottom=0,
@@ -618,27 +597,28 @@ def cpu_usage():
         time_series_fig.xaxis.axis_label = "Time in seconds"
         time_series_fig.yaxis.axis_label = "Number of CPUs used"
 
-        handle = show(gridplot(time_series_fig,
+        handle = show(
+            gridplot(
+                time_series_fig,
                 ncols=1,
                 plot_width=500,
                 plot_height=500,
-                               toolbar_location="below"), notebook_handle=True)
+                toolbar_location="below"),
+            notebook_handle=True)
 
         def update_plot(abs_earliest, abs_latest, abs_num_tasks, tasks):
             num_buckets = 100
-            left, right, top = compute_utilizations(abs_earliest,
-                                                    abs_latest,
-                                                    abs_num_tasks,
-                                                    tasks,
-                                                    num_buckets)
+            left, right, top = compute_utilizations(
+                abs_earliest, abs_latest, abs_num_tasks, tasks, num_buckets)
 
-            time_series_source.data = {"left": left,
+            time_series_source.data = {
+                "left": left,
                 "right": right,
-                                       "top": top}
+                "top": top
+            }
 
-            x_range = (max(0, min(left))
-                       if len(left) else 0,
-                       max(right) if len(right) else 1)
+            x_range = (max(0, min(left)) if len(left) else 0, max(right)
+                       if len(right) else 1)
             y_range = (0, max(top) + 1 if len(top) else 1)
 
             # Define the axis ranges
@@ -654,6 +634,7 @@ def cpu_usage():
             push_notebook(handle=handle)
 
         get_sliders(update_plot)
+
     plot_utilization()
 
 
@@ -672,27 +653,26 @@ def cluster_usage():
     output_notebook(resources=CDN)
 
     # Initial values
-    source = ColumnDataSource(data={"node_ip_address": ['127.0.0.1'],
+    source = ColumnDataSource(
+        data={
+            "node_ip_address": ['127.0.0.1'],
             "time": ['0.5'],
             "num_tasks": ['1'],
-                                    "length": [1]})
+            "length": [1]
+        })
 
     # Define the color schema
-    colors = ["#75968f",
-              "#a5bab7",
-              "#c9d9d3",
-              "#e2e2e2",
-              "#dfccce",
-              "#ddb7b1",
-              "#cc7878",
-              "#933b41",
-              "#550b1d"]
+    colors = [
+        "#75968f", "#a5bab7", "#c9d9d3", "#e2e2e2", "#dfccce", "#ddb7b1",
+        "#cc7878", "#933b41", "#550b1d"
+    ]
     mapper = LinearColorMapper(palette=colors, low=0, high=2)
 
     TOOLS = "hover, save, xpan, box_zoom, reset, xwheel_zoom"
 
     # Create the plot
-    p = figure(title="Cluster Usage",
+    p = figure(
+        title="Cluster Usage",
         y_range=list(set(source.data['node_ip_address'])),
         x_axis_location="above",
         plot_width=900,
@@ -709,13 +689,21 @@ def cluster_usage():
     p.xaxis.major_label_orientation = np.pi / 3
 
     # Plot rectangles
-    p.rect(x="time", y="node_ip_address", width="length", height=1,
+    p.rect(
+        x="time",
+        y="node_ip_address",
+        width="length",
+        height=1,
         source=source,
-           fill_color={"field": "num_tasks", "transform": mapper},
+        fill_color={
+            "field": "num_tasks",
+            "transform": mapper
+        },
         line_color=None)
 
     # Add legend to the side of the plot
-    color_bar = ColorBar(color_mapper=mapper,
+    color_bar = ColorBar(
+        color_mapper=mapper,
         major_label_text_font_size="8pt",
         ticker=BasicTicker(desired_num_ticks=len(colors)),
         label_standoff=6,
@@ -724,11 +712,10 @@ def cluster_usage():
     p.add_layout(color_bar, "right")
 
     # Define hover tool
-    p.select_one(HoverTool).tooltips = [
-         ("Node IP Address", "@node_ip_address"),
-         ("Number of tasks running", "@num_tasks"),
-         ("Time", "@time")
-    ]
+    p.select_one(HoverTool).tooltips = [("Node IP Address",
+                                         "@node_ip_address"),
+                                        ("Number of tasks running",
+                                         "@num_tasks"), ("Time", "@time")]
 
     # Define the axis labels
     p.xaxis.axis_label = "Time in seconds"
@@ -764,12 +751,8 @@ def cluster_usage():
         num_tasks = []
 
         for node_ip, task_dict in node_to_tasks.items():
-            left, right, top = compute_utilizations(earliest,
-                                                    latest,
-                                                    abs_num_tasks,
-                                                    task_dict,
-                                                    100,
-                                                    True)
+            left, right, top = compute_utilizations(
+                earliest, latest, abs_num_tasks, task_dict, 100, True)
             for (l, r, t) in zip(left, right, top):
                 nodes.append(node_ip)
                 times.append((l + r) / 2)
@@ -783,10 +766,12 @@ def cluster_usage():
         mapper.high = max(max(num_tasks), 1)
 
         # Update plot with new data based on slider and text box values
-        source.data = {"node_ip_address": nodes,
+        source.data = {
+            "node_ip_address": nodes,
             "time": times,
             "num_tasks": num_tasks,
-                       "length": lengths}
+            "length": lengths
+        }
 
         push_notebook(handle=handle)
 

python/ray/global_scheduler/global_scheduler_services.py

@@ -7,9 +7,12 @@ import subprocess
 import time
 
 
-def start_global_scheduler(redis_address, node_ip_address,
-                           use_valgrind=False, use_profiler=False,
-                           stdout_file=None, stderr_file=None):
+def start_global_scheduler(redis_address,
+                           node_ip_address,
+                           use_valgrind=False,
+                           use_profiler=False,
+                           stdout_file=None,
+                           stderr_file=None):
     """Start a global scheduler process.
 
     Args:
@@ -33,21 +36,24 @@ def start_global_scheduler(redis_address, node_ip_address,
     global_scheduler_executable = os.path.join(
         os.path.abspath(os.path.dirname(__file__)),
         "../core/src/global_scheduler/global_scheduler")
-    command = [global_scheduler_executable,
-               "-r", redis_address,
-               "-h", node_ip_address]
+    command = [
+        global_scheduler_executable, "-r", redis_address, "-h", node_ip_address
+    ]
     if use_valgrind:
-        pid = subprocess.Popen(["valgrind",
-                                "--track-origins=yes",
-                                "--leak-check=full",
-                                "--show-leak-kinds=all",
-                                "--leak-check-heuristics=stdstring",
-                                "--error-exitcode=1"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            [
+                "valgrind", "--track-origins=yes", "--leak-check=full",
+                "--show-leak-kinds=all", "--leak-check-heuristics=stdstring",
+                "--error-exitcode=1"
+            ] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     elif use_profiler:
-        pid = subprocess.Popen(["valgrind", "--tool=callgrind"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            ["valgrind", "--tool=callgrind"] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     else:
         pid = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)

python/ray/global_scheduler/test/test.py

@@ -56,7 +56,6 @@ def new_port():
 
 
 class TestGlobalScheduler(unittest.TestCase):
-
     def setUp(self):
         # Start one Redis server and N pairs of (plasma, local_scheduler)
         self.node_ip_address = "127.0.0.1"
@@ -164,17 +163,19 @@ class TestGlobalScheduler(unittest.TestCase):
         return db_client_id
 
     def test_task_default_resources(self):
-        task1 = local_scheduler.Task(random_driver_id(), random_function_id(),
-                                     [random_object_id()], 0, random_task_id(),
-                                     0)
+        task1 = local_scheduler.Task(
+            random_driver_id(), random_function_id(), [random_object_id()], 0,
+            random_task_id(), 0)
         self.assertEqual(task1.required_resources(), {"CPU": 1})
-        task2 = local_scheduler.Task(random_driver_id(), random_function_id(),
-                                     [random_object_id()], 0, random_task_id(),
-                                     0, local_scheduler.ObjectID(NIL_ACTOR_ID),
+        task2 = local_scheduler.Task(
+            random_driver_id(), random_function_id(), [random_object_id()], 0,
+            random_task_id(), 0, local_scheduler.ObjectID(NIL_ACTOR_ID),
             local_scheduler.ObjectID(NIL_OBJECT_ID),
             local_scheduler.ObjectID(NIL_ACTOR_ID),
-                                     local_scheduler.ObjectID(NIL_ACTOR_ID),
-                                     0, 0, [], {"CPU": 1, "GPU": 2})
+            local_scheduler.ObjectID(NIL_ACTOR_ID), 0, 0, [], {
+                "CPU": 1,
+                "GPU": 2
+            })
         self.assertEqual(task2.required_resources(), {"CPU": 1, "GPU": 2})
 
     def test_redis_only_single_task(self):
@@ -189,7 +190,7 @@ class TestGlobalScheduler(unittest.TestCase):
             len(self.state.client_table()[self.node_ip_address]),
             2 * NUM_CLUSTER_NODES + 1)
         db_client_id = self.get_plasma_manager_id()
-        assert(db_client_id is not None)
+        assert (db_client_id is not None)
 
     @unittest.skipIf(
         os.environ.get('RAY_USE_NEW_GCS', False),
@@ -227,9 +228,10 @@ class TestGlobalScheduler(unittest.TestCase):
             if len(task_entries) == 1:
                 task_id, task = task_entries.popitem()
                 task_status = task["State"]
-                self.assertTrue(task_status in [state.TASK_STATUS_WAITING,
-                                                state.TASK_STATUS_SCHEDULED,
-                                                state.TASK_STATUS_QUEUED])
+                self.assertTrue(task_status in [
+                    state.TASK_STATUS_WAITING, state.TASK_STATUS_SCHEDULED,
+                    state.TASK_STATUS_QUEUED
+                ])
                 if task_status == state.TASK_STATUS_QUEUED:
                     break
                 else:
@@ -258,17 +260,14 @@ class TestGlobalScheduler(unittest.TestCase):
             data_size = np.random.randint(1 << 12)
             metadata_size = np.random.randint(1 << 9)
             plasma_client = self.plasma_clients[0]
-            object_dep, memory_buffer, metadata = create_object(plasma_client,
-                                                                data_size,
-                                                                metadata_size,
-                                                                seal=True)
+            object_dep, memory_buffer, metadata = create_object(
+                plasma_client, data_size, metadata_size, seal=True)
             if timesync:
                 # Give 10ms for object info handler to fire (long enough to
                 # yield CPU).
                 time.sleep(0.010)
             task = local_scheduler.Task(
-                random_driver_id(),
-                random_function_id(),
+                random_driver_id(), random_function_id(),
                 [local_scheduler.ObjectID(object_dep.binary())],
                 num_return_vals[0], random_task_id(), 0)
             self.local_scheduler_clients[0].submit(task)
@@ -281,12 +280,18 @@ class TestGlobalScheduler(unittest.TestCase):
             self.assertLessEqual(len(task_entries), num_tasks)
             # First, check if all tasks made it to Redis.
             if len(task_entries) == num_tasks:
-                task_statuses = [task_entry["State"] for task_entry in
-                                 task_entries.values()]
-                self.assertTrue(all([status in [state.TASK_STATUS_WAITING,
+                task_statuses = [
+                    task_entry["State"]
+                    for task_entry in task_entries.values()
+                ]
+                self.assertTrue(
+                    all([
+                        status in [
+                            state.TASK_STATUS_WAITING,
                             state.TASK_STATUS_SCHEDULED,
-                                                state.TASK_STATUS_QUEUED]
-                                     for status in task_statuses]))
+                            state.TASK_STATUS_QUEUED
+                        ] for status in task_statuses
+                    ]))
                 num_tasks_done = task_statuses.count(state.TASK_STATUS_QUEUED)
                 num_tasks_scheduled = task_statuses.count(
                     state.TASK_STATUS_SCHEDULED)
@@ -294,12 +299,13 @@ class TestGlobalScheduler(unittest.TestCase):
                     state.TASK_STATUS_WAITING)
                 print("tasks in Redis = {}, tasks waiting = {}, "
                       "tasks scheduled = {}, "
-                      "tasks queued = {}, retries left = {}"
-                      .format(len(task_entries), num_tasks_waiting,
-                              num_tasks_scheduled, num_tasks_done,
-                              num_retries))
-                if all([status == state.TASK_STATUS_QUEUED for status in
-                        task_statuses]):
+                      "tasks queued = {}, retries left = {}".format(
+                          len(task_entries), num_tasks_waiting,
+                          num_tasks_scheduled, num_tasks_done, num_retries))
+                if all([
+                        status == state.TASK_STATUS_QUEUED
+                        for status in task_statuses
+                ]):
                     # We're done, so pass.
                     break
             num_retries -= 1

python/ray/local_scheduler/__init__.py

@@ -7,6 +7,8 @@ from ray.core.src.local_scheduler.liblocal_scheduler_library import (
     task_to_string, _config, common_error)
 from .local_scheduler_services import start_local_scheduler
 
-__all__ = ["Task", "LocalSchedulerClient", "ObjectID", "check_simple_value",
-           "task_from_string", "task_to_string", "start_local_scheduler",
-           "_config", "common_error"]
+__all__ = [
+    "Task", "LocalSchedulerClient", "ObjectID", "check_simple_value",
+    "task_from_string", "task_to_string", "start_local_scheduler", "_config",
+    "common_error"
+]

python/ray/local_scheduler/local_scheduler_services.py

@@ -68,15 +68,15 @@ def start_local_scheduler(plasma_store_name,
                         "provided.")
     if use_valgrind and use_profiler:
         raise Exception("Cannot use valgrind and profiler at the same time.")
-    local_scheduler_executable = os.path.join(os.path.dirname(
-        os.path.abspath(__file__)),
+    local_scheduler_executable = os.path.join(
+        os.path.dirname(os.path.abspath(__file__)),
         "../core/src/local_scheduler/local_scheduler")
     local_scheduler_name = "/tmp/scheduler{}".format(random_name())
-    command = [local_scheduler_executable,
-               "-s", local_scheduler_name,
-               "-p", plasma_store_name,
-               "-h", node_ip_address,
-               "-n", str(num_workers)]
+    command = [
+        local_scheduler_executable, "-s", local_scheduler_name, "-p",
+        plasma_store_name, "-h", node_ip_address, "-n",
+        str(num_workers)
+    ]
     if plasma_manager_name is not None:
         command += ["-m", plasma_manager_name]
     if worker_path is not None:
@@ -88,13 +88,10 @@ def start_local_scheduler(plasma_store_name,
                                 "--object-store-name={} "
                                 "--object-store-manager-name={} "
                                 "--local-scheduler-name={} "
-                                "--redis-address={}"
-                                .format(sys.executable,
-                                        worker_path,
-                                        node_ip_address,
-                                        plasma_store_name,
-                                        plasma_manager_name,
-                                        local_scheduler_name,
+                                "--redis-address={}".format(
+                                    sys.executable, worker_path,
+                                    node_ip_address, plasma_store_name,
+                                    plasma_manager_name, local_scheduler_name,
                                     redis_address))
         command += ["-w", start_worker_command]
     if redis_address is not None:
@@ -104,27 +101,31 @@ def start_local_scheduler(plasma_store_name,
     if static_resources is not None:
         resource_argument = ""
         for resource_name, resource_quantity in static_resources.items():
-            assert (isinstance(resource_quantity, int) or
-                    isinstance(resource_quantity, float))
-        resource_argument = ",".join(
-            [resource_name + "," + str(resource_quantity)
-             for resource_name, resource_quantity in static_resources.items()])
+            assert (isinstance(resource_quantity, int)
+                    or isinstance(resource_quantity, float))
+        resource_argument = ",".join([
+            resource_name + "," + str(resource_quantity)
+            for resource_name, resource_quantity in static_resources.items()
+        ])
     else:
         resource_argument = "CPU,{}".format(psutil.cpu_count())
     command += ["-c", resource_argument]
 
     if use_valgrind:
-        pid = subprocess.Popen(["valgrind",
-                                "--track-origins=yes",
-                                "--leak-check=full",
-                                "--show-leak-kinds=all",
-                                "--leak-check-heuristics=stdstring",
-                                "--error-exitcode=1"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            [
+                "valgrind", "--track-origins=yes", "--leak-check=full",
+                "--show-leak-kinds=all", "--leak-check-heuristics=stdstring",
+                "--error-exitcode=1"
+            ] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     elif use_profiler:
-        pid = subprocess.Popen(["valgrind", "--tool=callgrind"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            ["valgrind", "--tool=callgrind"] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     else:
         pid = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)

python/ray/local_scheduler/test/test.py

@@ -37,7 +37,6 @@ def random_function_id():
 
 
 class TestLocalSchedulerClient(unittest.TestCase):
-
     def setUp(self):
         # Start Plasma store.
         plasma_store_name, self.p1 = plasma.start_plasma_store()
@@ -74,34 +73,17 @@ class TestLocalSchedulerClient(unittest.TestCase):
             self.plasma_client.create(pa.plasma.ObjectID(object_id.id()), 0)
             self.plasma_client.seal(pa.plasma.ObjectID(object_id.id()))
         # Define some arguments to use for the tasks.
-        args_list = [
-            [],
-            [{}],
-            [()],
-            1 * [1],
-            10 * [1],
-            100 * [1],
-            1000 * [1],
-            1 * ["a"],
-            10 * ["a"],
-            100 * ["a"],
-            1000 * ["a"],
-            [1, 1.3, 1 << 100, "hi", u"hi", [1, 2]],
-            object_ids[:1],
-            object_ids[:2],
-            object_ids[:3],
-            object_ids[:4],
-            object_ids[:5],
-            object_ids[:10],
-            object_ids[:100],
-            object_ids[:256],
-            [1, object_ids[0]],
-            [object_ids[0], "a"],
-            [1, object_ids[0], "a"],
-            [object_ids[0], 1, object_ids[1], "a"],
-            object_ids[:3] + [1, "hi", 2.3] + object_ids[:5],
-            object_ids + 100 * ["a"] + object_ids
-        ]
+        args_list = [[], [{}], [()], 1 * [1], 10 * [1], 100 * [1], 1000 * [1],
+                     1 * ["a"], 10 * ["a"], 100 * ["a"], 1000 * ["a"], [
+                         1, 1.3, 1 << 100, "hi", u"hi", [1, 2]
+                     ], object_ids[:1], object_ids[:2], object_ids[:3],
+                     object_ids[:4], object_ids[:5], object_ids[:10],
+                     object_ids[:100], object_ids[:256], [1, object_ids[0]], [
+                         object_ids[0], "a"
+                     ], [1, object_ids[0], "a"], [
+                         object_ids[0], 1, object_ids[1], "a"
+                     ], object_ids[:3] + [1, "hi", 2.3] + object_ids[:5],
+                     object_ids + 100 * ["a"] + object_ids]
 
         for args in args_list:
             for num_return_vals in [0, 1, 2, 3, 5, 10, 100]:
@@ -146,6 +128,7 @@ class TestLocalSchedulerClient(unittest.TestCase):
         # Launch a thread to get the task.
         def get_task():
             self.local_scheduler_client.get_task()
+
         t = threading.Thread(target=get_task)
         t.start()
         # Sleep to give the thread time to call get_task.
@@ -170,6 +153,7 @@ class TestLocalSchedulerClient(unittest.TestCase):
         # Launch a thread to get the task.
         def get_task():
             self.local_scheduler_client.get_task()
+
         t = threading.Thread(target=get_task)
         t.start()
 

python/ray/log_monitor.py

@@ -26,11 +26,12 @@ class LogMonitor(object):
         log_file_handles: A dictionary mapping the name of a log file to a file
             handle for that file.
     """
+
     def __init__(self, redis_ip_address, redis_port, node_ip_address):
         """Initialize the log monitor object."""
         self.node_ip_address = node_ip_address
-        self.redis_client = redis.StrictRedis(host=redis_ip_address,
-                                              port=redis_port)
+        self.redis_client = redis.StrictRedis(
+            host=redis_ip_address, port=redis_port)
         self.log_files = {}
         self.log_file_handles = {}
         self.files_to_ignore = set()
@@ -38,9 +39,8 @@ class LogMonitor(object):
     def update_log_filenames(self):
         """Get the most up-to-date list of log files to monitor from Redis."""
         num_current_log_files = len(self.log_files)
-        new_log_filenames = self.redis_client.lrange(
-            "LOG_FILENAMES:{}".format(self.node_ip_address),
-            num_current_log_files, -1)
+        new_log_filenames = self.redis_client.lrange("LOG_FILENAMES:{}".format(
+            self.node_ip_address), num_current_log_files, -1)
         for log_filename in new_log_filenames:
             print("Beginning to track file {}".format(log_filename))
             assert log_filename not in self.log_files
@@ -78,8 +78,8 @@ class LogMonitor(object):
             # Try to open this file for the first time.
             else:
                 try:
-                    self.log_file_handles[log_filename] = open(log_filename,
-                                                               "r")
+                    self.log_file_handles[log_filename] = open(
+                        log_filename, "r")
                 except IOError as e:
                     if e.errno == os.errno.EMFILE:
                         print("Warning: Ignoring {} because there are too "
@@ -106,12 +106,19 @@ class LogMonitor(object):
 
 
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description=("Parse Redis server for the "
+    parser = argparse.ArgumentParser(
+        description=("Parse Redis server for the "
                      "log monitor to connect "
                      "to."))
-    parser.add_argument("--redis-address", required=True, type=str,
+    parser.add_argument(
+        "--redis-address",
+        required=True,
+        type=str,
         help="The address to use for Redis.")
-    parser.add_argument("--node-ip-address", required=True, type=str,
+    parser.add_argument(
+        "--node-ip-address",
+        required=True,
+        type=str,
         help="The IP address of the node this process is on.")
     args = parser.parse_args()
 

python/ray/monitor.py

@@ -100,8 +100,8 @@ class Monitor(object):
         self.local_scheduler_id_to_ip_map = dict()
         self.load_metrics = LoadMetrics()
         if autoscaling_config:
-            self.autoscaler = StandardAutoscaler(
-                autoscaling_config, self.load_metrics)
+            self.autoscaler = StandardAutoscaler(autoscaling_config,
+                                                 self.load_metrics)
         else:
             self.autoscaler = None
 
@@ -160,11 +160,9 @@ class Monitor(object):
             # task as lost.
             key = binary_to_object_id(hex_to_binary(task_id))
             ok = self.state._execute_command(
-                key, "RAY.TASK_TABLE_UPDATE",
-                hex_to_binary(task_id),
+                key, "RAY.TASK_TABLE_UPDATE", hex_to_binary(task_id),
                 ray.experimental.state.TASK_STATUS_LOST, NIL_ID,
-                task["ExecutionDependenciesString"],
-                task["SpillbackCount"])
+                task["ExecutionDependenciesString"], task["SpillbackCount"])
             if ok != b"OK":
                 log.warn("Failed to update lost task for dead scheduler.")
             num_tasks_updated += 1
@@ -428,8 +426,8 @@ class Monitor(object):
         """
         message = DriverTableMessage.GetRootAsDriverTableMessage(data, 0)
         driver_id = message.DriverId()
-        log.info(
-            "Driver {} has been removed.".format(binary_to_hex(driver_id)))
+        log.info("Driver {} has been removed.".format(
+            binary_to_hex(driver_id)))
 
         self._clean_up_entries_for_driver(driver_id)
 
@@ -571,7 +569,8 @@ class Monitor(object):
 
 
 if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description=("Parse Redis server for the "
+    parser = argparse.ArgumentParser(
+        description=("Parse Redis server for the "
                      "monitor to connect to."))
     parser.add_argument(
         "--redis-address",

python/ray/plasma/__init__.py

@@ -5,5 +5,6 @@ from __future__ import print_function
 from ray.plasma.plasma import (start_plasma_store, start_plasma_manager,
                                DEFAULT_PLASMA_STORE_MEMORY)
 
-__all__ = ["start_plasma_store", "start_plasma_manager",
-           "DEFAULT_PLASMA_STORE_MEMORY"]
+__all__ = [
+    "start_plasma_store", "start_plasma_manager", "DEFAULT_PLASMA_STORE_MEMORY"
+]

python/ray/plasma/plasma.py

@@ -8,13 +8,13 @@ import subprocess
 import sys
 import time
 
+__all__ = [
+    "start_plasma_store", "start_plasma_manager", "DEFAULT_PLASMA_STORE_MEMORY"
+]
 
-__all__ = ["start_plasma_store", "start_plasma_manager",
-           "DEFAULT_PLASMA_STORE_MEMORY"]
+PLASMA_WAIT_TIMEOUT = 2**30
 
-PLASMA_WAIT_TIMEOUT = 2 ** 30
-
-DEFAULT_PLASMA_STORE_MEMORY = 10 ** 9
+DEFAULT_PLASMA_STORE_MEMORY = 10**9
 
 
 def random_name():
@@ -22,9 +22,12 @@ def random_name():
 
 
 def start_plasma_store(plasma_store_memory=DEFAULT_PLASMA_STORE_MEMORY,
-                       use_valgrind=False, use_profiler=False,
-                       stdout_file=None, stderr_file=None,
-                       plasma_directory=None, huge_pages=False):
+                       use_valgrind=False,
+                       use_profiler=False,
+                       stdout_file=None,
+                       stderr_file=None,
+                       plasma_directory=None,
+                       huge_pages=False):
     """Start a plasma store process.
 
     Args:
@@ -48,8 +51,8 @@ def start_plasma_store(plasma_store_memory=DEFAULT_PLASMA_STORE_MEMORY,
     if use_valgrind and use_profiler:
         raise Exception("Cannot use valgrind and profiler at the same time.")
 
-    if huge_pages and not (sys.platform == "linux" or
-                           sys.platform == "linux2"):
+    if huge_pages and not (sys.platform == "linux"
+                           or sys.platform == "linux2"):
         raise Exception("The huge_pages argument is only supported on "
                         "Linux.")
 
@@ -57,29 +60,33 @@ def start_plasma_store(plasma_store_memory=DEFAULT_PLASMA_STORE_MEMORY,
         raise Exception("If huge_pages is True, then the "
                         "plasma_directory argument must be provided.")
 
-    plasma_store_executable = os.path.join(os.path.abspath(
-        os.path.dirname(__file__)),
+    plasma_store_executable = os.path.join(
+        os.path.abspath(os.path.dirname(__file__)),
         "../core/src/plasma/plasma_store")
     plasma_store_name = "/tmp/plasma_store{}".format(random_name())
-    command = [plasma_store_executable,
-               "-s", plasma_store_name,
-               "-m", str(plasma_store_memory)]
+    command = [
+        plasma_store_executable, "-s", plasma_store_name, "-m",
+        str(plasma_store_memory)
+    ]
     if plasma_directory is not None:
         command += ["-d", plasma_directory]
     if huge_pages:
         command += ["-h"]
     if use_valgrind:
-        pid = subprocess.Popen(["valgrind",
-                                "--track-origins=yes",
-                                "--leak-check=full",
-                                "--show-leak-kinds=all",
-                                "--leak-check-heuristics=stdstring",
-                                "--error-exitcode=1"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            [
+                "valgrind", "--track-origins=yes", "--leak-check=full",
+                "--show-leak-kinds=all", "--leak-check-heuristics=stdstring",
+                "--error-exitcode=1"
+            ] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     elif use_profiler:
-        pid = subprocess.Popen(["valgrind", "--tool=callgrind"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            ["valgrind", "--tool=callgrind"] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     else:
         pid = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)
@@ -91,10 +98,14 @@ def new_port():
     return random.randint(10000, 65535)
 
 
-def start_plasma_manager(store_name, redis_address,
-                         node_ip_address="127.0.0.1", plasma_manager_port=None,
-                         num_retries=20, use_valgrind=False,
-                         run_profiler=False, stdout_file=None,
+def start_plasma_manager(store_name,
+                         redis_address,
+                         node_ip_address="127.0.0.1",
+                         plasma_manager_port=None,
+                         num_retries=20,
+                         use_valgrind=False,
+                         run_profiler=False,
+                         stdout_file=None,
                          stderr_file=None):
     """Start a plasma manager and return the ports it listens on.
 
@@ -133,27 +144,35 @@ def start_plasma_manager(store_name, redis_address,
     while counter < num_retries:
         if counter > 0:
             print("Plasma manager failed to start, retrying now.")
-        command = [plasma_manager_executable,
-                   "-s", store_name,
-                   "-m", plasma_manager_name,
-                   "-h", node_ip_address,
-                   "-p", str(plasma_manager_port),
-                   "-r", redis_address,
+        command = [
+            plasma_manager_executable,
+            "-s",
+            store_name,
+            "-m",
+            plasma_manager_name,
+            "-h",
+            node_ip_address,
+            "-p",
+            str(plasma_manager_port),
+            "-r",
+            redis_address,
         ]
         if use_valgrind:
-            process = subprocess.Popen(["valgrind",
-                                        "--track-origins=yes",
-                                        "--leak-check=full",
-                                        "--show-leak-kinds=all",
-                                        "--error-exitcode=1"] + command,
-                                       stdout=stdout_file, stderr=stderr_file)
-        elif run_profiler:
-            process = subprocess.Popen((["valgrind", "--tool=callgrind"] +
-                                        command),
-                                       stdout=stdout_file, stderr=stderr_file)
-        else:
-            process = subprocess.Popen(command, stdout=stdout_file,
+            process = subprocess.Popen(
+                [
+                    "valgrind", "--track-origins=yes", "--leak-check=full",
+                    "--show-leak-kinds=all", "--error-exitcode=1"
+                ] + command,
+                stdout=stdout_file,
                 stderr=stderr_file)
+        elif run_profiler:
+            process = subprocess.Popen(
+                (["valgrind", "--tool=callgrind"] + command),
+                stdout=stdout_file,
+                stderr=stderr_file)
+        else:
+            process = subprocess.Popen(
+                command, stdout=stdout_file, stderr=stderr_file)
         # This sleep is critical. If the plasma_manager fails to start because
         # the port is already in use, then we need it to fail within 0.1
         # seconds.

python/ray/plasma/test/test.py

@@ -16,8 +16,8 @@ import unittest
 # The ray import must come before the pyarrow import because ray modifies the
 # python path so that the right version of pyarrow is found.
 import ray
-from ray.plasma.utils import (random_object_id,
-                              create_object_with_id, create_object)
+from ray.plasma.utils import (random_object_id, create_object_with_id,
+                              create_object)
 from ray import services
 import pyarrow as pa
 import pyarrow.plasma as plasma
@@ -30,8 +30,12 @@ def random_name():
     return str(random.randint(0, 99999999))
 
 
-def assert_get_object_equal(unit_test, client1, client2, object_id,
-                            memory_buffer=None, metadata=None):
+def assert_get_object_equal(unit_test,
+                            client1,
+                            client2,
+                            object_id,
+                            memory_buffer=None,
+                            metadata=None):
     client1_buff = client1.get_buffers([object_id])[0]
     client2_buff = client2.get_buffers([object_id])[0]
     client1_metadata = client1.get_metadata([object_id])[0]
@@ -39,27 +43,33 @@ def assert_get_object_equal(unit_test, client1, client2, object_id,
     unit_test.assertEqual(len(client1_buff), len(client2_buff))
     unit_test.assertEqual(len(client1_metadata), len(client2_metadata))
     # Check that the buffers from the two clients are the same.
-    assert_equal(np.frombuffer(client1_buff, dtype="uint8"),
+    assert_equal(
+        np.frombuffer(client1_buff, dtype="uint8"),
         np.frombuffer(client2_buff, dtype="uint8"))
     # Check that the metadata buffers from the two clients are the same.
-    assert_equal(np.frombuffer(client1_metadata, dtype="uint8"),
+    assert_equal(
+        np.frombuffer(client1_metadata, dtype="uint8"),
         np.frombuffer(client2_metadata, dtype="uint8"))
     # If a reference buffer was provided, check that it is the same as well.
     if memory_buffer is not None:
-        assert_equal(np.frombuffer(memory_buffer, dtype="uint8"),
+        assert_equal(
+            np.frombuffer(memory_buffer, dtype="uint8"),
             np.frombuffer(client1_buff, dtype="uint8"))
     # If reference metadata was provided, check that it is the same as well.
     if metadata is not None:
-        assert_equal(np.frombuffer(metadata, dtype="uint8"),
+        assert_equal(
+            np.frombuffer(metadata, dtype="uint8"),
             np.frombuffer(client1_metadata, dtype="uint8"))
 
 
-DEFAULT_PLASMA_STORE_MEMORY = 10 ** 9
+DEFAULT_PLASMA_STORE_MEMORY = 10**9
 
 
 def start_plasma_store(plasma_store_memory=DEFAULT_PLASMA_STORE_MEMORY,
-                       use_valgrind=False, use_profiler=False,
-                       stdout_file=None, stderr_file=None):
+                       use_valgrind=False,
+                       use_profiler=False,
+                       stdout_file=None,
+                       stderr_file=None):
     """Start a plasma store process.
     Args:
         use_valgrind (bool): True if the plasma store should be started inside
@@ -78,21 +88,25 @@ def start_plasma_store(plasma_store_memory=DEFAULT_PLASMA_STORE_MEMORY,
         raise Exception("Cannot use valgrind and profiler at the same time.")
     plasma_store_executable = os.path.join(pa.__path__[0], "plasma_store")
     plasma_store_name = "/tmp/plasma_store{}".format(random_name())
-    command = [plasma_store_executable,
-               "-s", plasma_store_name,
-               "-m", str(plasma_store_memory)]
+    command = [
+        plasma_store_executable, "-s", plasma_store_name, "-m",
+        str(plasma_store_memory)
+    ]
     if use_valgrind:
-        pid = subprocess.Popen(["valgrind",
-                                "--track-origins=yes",
-                                "--leak-check=full",
-                                "--show-leak-kinds=all",
-                                "--leak-check-heuristics=stdstring",
-                                "--error-exitcode=1"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            [
+                "valgrind", "--track-origins=yes", "--leak-check=full",
+                "--show-leak-kinds=all", "--leak-check-heuristics=stdstring",
+                "--error-exitcode=1"
+            ] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     elif use_profiler:
-        pid = subprocess.Popen(["valgrind", "--tool=callgrind"] + command,
-                               stdout=stdout_file, stderr=stderr_file)
+        pid = subprocess.Popen(
+            ["valgrind", "--tool=callgrind"] + command,
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(1.0)
     else:
         pid = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)
@@ -104,13 +118,10 @@ def start_plasma_store(plasma_store_memory=DEFAULT_PLASMA_STORE_MEMORY,
 
 
 class TestPlasmaManager(unittest.TestCase):
-
     def setUp(self):
         # Start two PlasmaStores.
-        store_name1, self.p2 = start_plasma_store(
-            use_valgrind=USE_VALGRIND)
-        store_name2, self.p3 = start_plasma_store(
-            use_valgrind=USE_VALGRIND)
+        store_name1, self.p2 = start_plasma_store(use_valgrind=USE_VALGRIND)
+        store_name2, self.p3 = start_plasma_store(use_valgrind=USE_VALGRIND)
         # Start a Redis server.
         redis_address, _ = services.start_redis("127.0.0.1")
         # Start two PlasmaManagers.
@@ -152,9 +163,8 @@ class TestPlasmaManager(unittest.TestCase):
     def test_fetch(self):
         for _ in range(10):
             # Create an object.
-            object_id1, memory_buffer1, metadata1 = create_object(self.client1,
-                                                                  2000,
-                                                                  2000)
+            object_id1, memory_buffer1, metadata1 = create_object(
+                self.client1, 2000, 2000)
             self.client1.fetch([object_id1])
             self.assertEqual(self.client1.contains(object_id1), True)
             self.assertEqual(self.client2.contains(object_id1), False)
@@ -164,7 +174,10 @@ class TestPlasmaManager(unittest.TestCase):
             while not self.client2.contains(object_id1):
                 self.client2.fetch([object_id1])
             # Compare the two buffers.
-            assert_get_object_equal(self, self.client1, self.client2,
+            assert_get_object_equal(
+                self,
+                self.client1,
+                self.client2,
                 object_id1,
                 memory_buffer=memory_buffer1,
                 metadata=metadata1)
@@ -173,9 +186,8 @@ class TestPlasmaManager(unittest.TestCase):
         object_id2 = random_object_id()
         self.client1.fetch([object_id2])
         self.assertEqual(self.client1.contains(object_id2), False)
-        memory_buffer2, metadata2 = create_object_with_id(self.client2,
-                                                          object_id2,
-                                                          2000, 2000)
+        memory_buffer2, metadata2 = create_object_with_id(
+            self.client2, object_id2, 2000, 2000)
         # # Check that the object has been fetched.
         # self.assertEqual(self.client1.contains(object_id2), True)
         # Compare the two buffers.
@@ -190,66 +202,86 @@ class TestPlasmaManager(unittest.TestCase):
         for _ in range(10):
             self.client1.fetch([object_id3])
             self.client2.fetch([object_id3])
-        memory_buffer3, metadata3 = create_object_with_id(self.client1,
-                                                          object_id3,
-                                                          2000, 2000)
+        memory_buffer3, metadata3 = create_object_with_id(
+            self.client1, object_id3, 2000, 2000)
         for _ in range(10):
             self.client1.fetch([object_id3])
             self.client2.fetch([object_id3])
         # TODO(rkn): Right now we must wait for the object table to be updated.
         while not self.client2.contains(object_id3):
             self.client2.fetch([object_id3])
-        assert_get_object_equal(self, self.client1, self.client2, object_id3,
+        assert_get_object_equal(
+            self,
+            self.client1,
+            self.client2,
+            object_id3,
             memory_buffer=memory_buffer3,
             metadata=metadata3)
 
     def test_fetch_multiple(self):
         for _ in range(20):
             # Create two objects and a third fake one that doesn't exist.
-            object_id1, memory_buffer1, metadata1 = create_object(self.client1,
-                                                                  2000,
-                                                                  2000)
+            object_id1, memory_buffer1, metadata1 = create_object(
+                self.client1, 2000, 2000)
             missing_object_id = random_object_id()
-            object_id2, memory_buffer2, metadata2 = create_object(self.client1,
-                                                                  2000,
-                                                                  2000)
+            object_id2, memory_buffer2, metadata2 = create_object(
+                self.client1, 2000, 2000)
             object_ids = [object_id1, missing_object_id, object_id2]
             # Fetch the objects from the other plasma store. The second object
             # ID should timeout since it does not exist.
             # TODO(rkn): Right now we must wait for the object table to be
             # updated.
-            while ((not self.client2.contains(object_id1)) or
-                   (not self.client2.contains(object_id2))):
+            while ((not self.client2.contains(object_id1))
+                   or (not self.client2.contains(object_id2))):
                 self.client2.fetch(object_ids)
             # Compare the buffers of the objects that do exist.
-            assert_get_object_equal(self, self.client1, self.client2,
-                                    object_id1, memory_buffer=memory_buffer1,
+            assert_get_object_equal(
+                self,
+                self.client1,
+                self.client2,
+                object_id1,
+                memory_buffer=memory_buffer1,
                 metadata=metadata1)
-            assert_get_object_equal(self, self.client1, self.client2,
-                                    object_id2, memory_buffer=memory_buffer2,
+            assert_get_object_equal(
+                self,
+                self.client1,
+                self.client2,
+                object_id2,
+                memory_buffer=memory_buffer2,
                 metadata=metadata2)
             # Fetch in the other direction. The fake object still does not
             # exist.
             self.client1.fetch(object_ids)
-            assert_get_object_equal(self, self.client2, self.client1,
-                                    object_id1, memory_buffer=memory_buffer1,
+            assert_get_object_equal(
+                self,
+                self.client2,
+                self.client1,
+                object_id1,
+                memory_buffer=memory_buffer1,
                 metadata=metadata1)
-            assert_get_object_equal(self, self.client2, self.client1,
-                                    object_id2, memory_buffer=memory_buffer2,
+            assert_get_object_equal(
+                self,
+                self.client2,
+                self.client1,
+                object_id2,
+                memory_buffer=memory_buffer2,
                 metadata=metadata2)
 
         # Check that we can call fetch with duplicated object IDs.
         object_id3 = random_object_id()
         self.client1.fetch([object_id3, object_id3])
-        object_id4, memory_buffer4, metadata4 = create_object(self.client1,
-                                                              2000,
-                                                              2000)
+        object_id4, memory_buffer4, metadata4 = create_object(
+            self.client1, 2000, 2000)
         time.sleep(0.1)
         # TODO(rkn): Right now we must wait for the object table to be updated.
         while not self.client2.contains(object_id4):
-            self.client2.fetch([object_id3, object_id3, object_id4,
-                                object_id4])
-        assert_get_object_equal(self, self.client2, self.client1, object_id4,
+            self.client2.fetch(
+                [object_id3, object_id3, object_id4, object_id4])
+        assert_get_object_equal(
+            self,
+            self.client2,
+            self.client1,
+            object_id4,
             memory_buffer=memory_buffer4,
             metadata=metadata4)
 
@@ -263,8 +295,8 @@ class TestPlasmaManager(unittest.TestCase):
         obj_id1 = random_object_id()
         self.client1.create(obj_id1, 1000)
         self.client1.seal(obj_id1)
-        ready, waiting = self.client1.wait([obj_id1], timeout=100,
-                                           num_returns=1)
+        ready, waiting = self.client1.wait(
+            [obj_id1], timeout=100, num_returns=1)
         self.assertEqual(set(ready), set([obj_id1]))
         self.assertEqual(waiting, [])
 
@@ -273,8 +305,8 @@ class TestPlasmaManager(unittest.TestCase):
         obj_id2 = random_object_id()
         self.client1.create(obj_id2, 1000)
         # Don't seal.
-        ready, waiting = self.client1.wait([obj_id2, obj_id1], timeout=100,
-                                           num_returns=1)
+        ready, waiting = self.client1.wait(
+            [obj_id2, obj_id1], timeout=100, num_returns=1)
         self.assertEqual(set(ready), set([obj_id1]))
         self.assertEqual(set(waiting), set([obj_id2]))
 
@@ -287,8 +319,8 @@ class TestPlasmaManager(unittest.TestCase):
 
         t = threading.Timer(0.1, finish)
         t.start()
-        ready, waiting = self.client1.wait([obj_id3, obj_id2, obj_id1],
-                                           timeout=1000, num_returns=2)
+        ready, waiting = self.client1.wait(
+            [obj_id3, obj_id2, obj_id1], timeout=1000, num_returns=2)
         self.assertEqual(set(ready), set([obj_id1, obj_id3]))
         self.assertEqual(set(waiting), set([obj_id2]))
 
@@ -319,26 +351,26 @@ class TestPlasmaManager(unittest.TestCase):
         waiting = object_ids
         retrieved = []
         for i in range(1, n + 1):
-            ready, waiting = self.client1.wait(waiting, timeout=1000,
-                                               num_returns=i)
+            ready, waiting = self.client1.wait(
+                waiting, timeout=1000, num_returns=i)
             self.assertEqual(len(ready), i)
             retrieved += ready
         self.assertEqual(set(retrieved), set(object_ids))
-        ready, waiting = self.client1.wait(object_ids, timeout=1000,
-                                           num_returns=len(object_ids))
+        ready, waiting = self.client1.wait(
+            object_ids, timeout=1000, num_returns=len(object_ids))
         self.assertEqual(set(ready), set(object_ids))
         self.assertEqual(waiting, [])
         # Try waiting for all of the object IDs on the second client.
         waiting = object_ids
         retrieved = []
         for i in range(1, n + 1):
-            ready, waiting = self.client2.wait(waiting, timeout=1000,
-                                               num_returns=i)
+            ready, waiting = self.client2.wait(
+                waiting, timeout=1000, num_returns=i)
             self.assertEqual(len(ready), i)
             retrieved += ready
         self.assertEqual(set(retrieved), set(object_ids))
-        ready, waiting = self.client2.wait(object_ids, timeout=1000,
-                                           num_returns=len(object_ids))
+        ready, waiting = self.client2.wait(
+            object_ids, timeout=1000, num_returns=len(object_ids))
         self.assertEqual(set(ready), set(object_ids))
         self.assertEqual(waiting, [])
 
@@ -363,9 +395,8 @@ class TestPlasmaManager(unittest.TestCase):
         num_attempts = 100
         for _ in range(100):
             # Create an object.
-            object_id1, memory_buffer1, metadata1 = create_object(self.client1,
-                                                                  2000,
-                                                                  2000)
+            object_id1, memory_buffer1, metadata1 = create_object(
+                self.client1, 2000, 2000)
             # Transfer the buffer to the the other Plasma store. There is a
             # race condition on the create and transfer of the object, so keep
             # trying until the object appears on the second Plasma store.
@@ -379,8 +410,12 @@ class TestPlasmaManager(unittest.TestCase):
             del buff
 
             # Compare the two buffers.
-            assert_get_object_equal(self, self.client1, self.client2,
-                                    object_id1, memory_buffer=memory_buffer1,
+            assert_get_object_equal(
+                self,
+                self.client1,
+                self.client2,
+                object_id1,
+                memory_buffer=memory_buffer1,
                 metadata=metadata1)
             # # Transfer the buffer again.
             # self.client1.transfer("127.0.0.1", self.port2, object_id1)
@@ -391,8 +426,8 @@ class TestPlasmaManager(unittest.TestCase):
             #                         metadata=metadata1)
 
             # Create an object.
-            object_id2, memory_buffer2, metadata2 = create_object(self.client2,
-                                                                  20000, 20000)
+            object_id2, memory_buffer2, metadata2 = create_object(
+                self.client2, 20000, 20000)
             # Transfer the buffer to the the other Plasma store. There is a
             # race condition on the create and transfer of the object, so keep
             # trying until the object appears on the second Plasma store.
@@ -406,8 +441,12 @@ class TestPlasmaManager(unittest.TestCase):
             del buff
 
             # Compare the two buffers.
-            assert_get_object_equal(self, self.client1, self.client2,
-                                    object_id2, memory_buffer=memory_buffer2,
+            assert_get_object_equal(
+                self,
+                self.client1,
+                self.client2,
+                object_id2,
+                memory_buffer=memory_buffer2,
                 metadata=metadata2)
 
     def test_illegal_functionality(self):
@@ -437,7 +476,6 @@ class TestPlasmaManager(unittest.TestCase):
 
 
 class TestPlasmaManagerRecovery(unittest.TestCase):
-
     def setUp(self):
         # Start a Plasma store.
         self.store_name, self.p2 = start_plasma_store(
@@ -446,9 +484,7 @@ class TestPlasmaManagerRecovery(unittest.TestCase):
         self.redis_address, _ = services.start_redis("127.0.0.1")
         # Start a PlasmaManagers.
         manager_name, self.p3, self.port1 = ray.plasma.start_plasma_manager(
-            self.store_name,
-            self.redis_address,
-            use_valgrind=USE_VALGRIND)
+            self.store_name, self.redis_address, use_valgrind=USE_VALGRIND)
         # Connect a PlasmaClient.
         self.client = plasma.connect(self.store_name, manager_name, 64)
 
@@ -501,8 +537,8 @@ class TestPlasmaManagerRecovery(unittest.TestCase):
         client2 = plasma.connect(self.store_name, manager_name, 64)
         ready, waiting = [], object_ids
         while True:
-            ready, waiting = client2.wait(object_ids, num_returns=num_objects,
-                                          timeout=0)
+            ready, waiting = client2.wait(
+                object_ids, num_returns=num_objects, timeout=0)
             if len(ready) == len(object_ids):
                 break
 

python/ray/plasma/utils.py

@@ -18,8 +18,8 @@ def generate_metadata(length):
         metadata_buffer[0] = random.randint(0, 255)
         metadata_buffer[-1] = random.randint(0, 255)
         for _ in range(100):
-            metadata_buffer[random.randint(0, length - 1)] = (
-                random.randint(0, 255))
+            metadata_buffer[random.randint(0, length - 1)] = (random.randint(
+                0, 255))
     return metadata_buffer
 
 
@@ -32,7 +32,10 @@ def write_to_data_buffer(buff, length):
             array[random.randint(0, length - 1)] = random.randint(0, 255)
 
 
-def create_object_with_id(client, object_id, data_size, metadata_size,
+def create_object_with_id(client,
+                          object_id,
+                          data_size,
+                          metadata_size,
                           seal=True):
     metadata = generate_metadata(metadata_size)
     memory_buffer = client.create(object_id, data_size, metadata)
@@ -44,7 +47,6 @@ def create_object_with_id(client, object_id, data_size, metadata_size,
 
 def create_object(client, data_size, metadata_size, seal=True):
     object_id = random_object_id()
-    memory_buffer, metadata = create_object_with_id(client, object_id,
-                                                    data_size, metadata_size,
-                                                    seal=seal)
+    memory_buffer, metadata = create_object_with_id(
+        client, object_id, data_size, metadata_size, seal=seal)
     return object_id, memory_buffer, metadata

python/ray/ray_constants.py

@@ -1,10 +1,8 @@
 from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
-
 """Ray constants used in the Python code."""
 
-
 # Abort autoscaling if more than this number of errors are encountered. This
 # is a safety feature to prevent e.g. runaway node launches.
 AUTOSCALER_MAX_NUM_FAILURES = 5

python/ray/scripts/scripts.py

@@ -7,8 +7,8 @@ import json
 import subprocess
 
 import ray.services as services
-from ray.autoscaler.commands import (
-    create_or_update_cluster, teardown_cluster, get_head_node_ip)
+from ray.autoscaler.commands import (create_or_update_cluster,
+                                     teardown_cluster, get_head_node_ip)
 
 
 def check_no_existing_redis_clients(node_ip_address, redis_client):
@@ -41,58 +41,116 @@ def cli():
 
 
 @click.command()
-@click.option("--node-ip-address", required=False, type=str,
+@click.option(
+    "--node-ip-address",
+    required=False,
+    type=str,
     help="the IP address of this node")
-@click.option("--redis-address", required=False, type=str,
+@click.option(
+    "--redis-address",
+    required=False,
+    type=str,
     help="the address to use for connecting to Redis")
-@click.option("--redis-port", required=False, type=str,
+@click.option(
+    "--redis-port",
+    required=False,
+    type=str,
     help="the port to use for starting Redis")
-@click.option("--num-redis-shards", required=False, type=int,
+@click.option(
+    "--num-redis-shards",
+    required=False,
+    type=int,
     help=("the number of additional Redis shards to use in "
           "addition to the primary Redis shard"))
-@click.option("--redis-max-clients", required=False, type=int,
+@click.option(
+    "--redis-max-clients",
+    required=False,
+    type=int,
     help=("If provided, attempt to configure Redis with this "
           "maximum number of clients."))
-@click.option("--redis-shard-ports", required=False, type=str,
+@click.option(
+    "--redis-shard-ports",
+    required=False,
+    type=str,
     help="the port to use for the Redis shards other than the "
     "primary Redis shard")
-@click.option("--object-manager-port", required=False, type=int,
+@click.option(
+    "--object-manager-port",
+    required=False,
+    type=int,
     help="the port to use for starting the object manager")
-@click.option("--object-store-memory", required=False, type=int,
+@click.option(
+    "--object-store-memory",
+    required=False,
+    type=int,
     help="the maximum amount of memory (in bytes) to allow the "
     "object store to use")
-@click.option("--num-workers", required=False, type=int,
+@click.option(
+    "--num-workers",
+    required=False,
+    type=int,
     help=("The initial number of workers to start on this node, "
           "note that the local scheduler may start additional "
           "workers. If you wish to control the total number of "
           "concurent tasks, then use --resources instead and "
           "specify the CPU field."))
-@click.option("--num-cpus", required=False, type=int,
+@click.option(
+    "--num-cpus",
+    required=False,
+    type=int,
     help="the number of CPUs on this node")
-@click.option("--num-gpus", required=False, type=int,
+@click.option(
+    "--num-gpus",
+    required=False,
+    type=int,
     help="the number of GPUs on this node")
-@click.option("--resources", required=False, default="{}", type=str,
+@click.option(
+    "--resources",
+    required=False,
+    default="{}",
+    type=str,
     help="a JSON serialized dictionary mapping resource name to "
     "resource quantity")
-@click.option("--head", is_flag=True, default=False,
+@click.option(
+    "--head",
+    is_flag=True,
+    default=False,
     help="provide this argument for the head node")
-@click.option("--no-ui", is_flag=True, default=False,
+@click.option(
+    "--no-ui",
+    is_flag=True,
+    default=False,
     help="provide this argument if the UI should not be started")
-@click.option("--block", is_flag=True, default=False,
+@click.option(
+    "--block",
+    is_flag=True,
+    default=False,
     help="provide this argument to block forever in this command")
-@click.option("--plasma-directory", required=False, type=str,
+@click.option(
+    "--plasma-directory",
+    required=False,
+    type=str,
     help="object store directory for memory mapped files")
-@click.option("--huge-pages", is_flag=True, default=False,
+@click.option(
+    "--huge-pages",
+    is_flag=True,
+    default=False,
     help="enable support for huge pages in the object store")
-@click.option("--autoscaling-config", required=False, type=str,
+@click.option(
+    "--autoscaling-config",
+    required=False,
+    type=str,
     help="the file that contains the autoscaling config")
-@click.option("--use-raylet", is_flag=True, default=False,
+@click.option(
+    "--use-raylet",
+    is_flag=True,
+    default=False,
     help="use the raylet code path, this is not supported yet")
 def start(node_ip_address, redis_address, redis_port, num_redis_shards,
           redis_max_clients, redis_shard_ports, object_manager_port,
           object_store_memory, num_workers, num_cpus, num_gpus, resources,
-          head, no_ui, block, plasma_directory, huge_pages,
-          autoscaling_config, use_raylet):
+          head, no_ui, block, plasma_directory, huge_pages, autoscaling_config,
+          use_raylet):
     # Convert hostnames to numerical IP address.
     if node_ip_address is not None:
         node_ip_address = services.address_to_ip(node_ip_address)
@@ -245,33 +303,54 @@ def start(node_ip_address, redis_address, redis_port, num_redis_shards,
 
 @click.command()
 def stop():
-    subprocess.call(["killall global_scheduler plasma_store plasma_manager "
-                     "local_scheduler raylet"], shell=True)
+    subprocess.call(
+        [
+            "killall global_scheduler plasma_store plasma_manager "
+            "local_scheduler raylet"
+        ],
+        shell=True)
 
     # Find the PID of the monitor process and kill it.
-    subprocess.call(["kill $(ps aux | grep monitor.py | grep -v grep | "
-                     "awk '{ print $2 }') 2> /dev/null"], shell=True)
+    subprocess.call(
+        [
+            "kill $(ps aux | grep monitor.py | grep -v grep | "
+            "awk '{ print $2 }') 2> /dev/null"
+        ],
+        shell=True)
 
     # Find the PID of the Redis process and kill it.
-    subprocess.call(["kill $(ps aux | grep redis-server | grep -v grep | "
-                     "awk '{ print $2 }') 2> /dev/null"], shell=True)
+    subprocess.call(
+        [
+            "kill $(ps aux | grep redis-server | grep -v grep | "
+            "awk '{ print $2 }') 2> /dev/null"
+        ],
+        shell=True)
 
     # Find the PIDs of the worker processes and kill them.
-    subprocess.call(["kill -9 $(ps aux | grep default_worker.py | "
-                     "grep -v grep | awk '{ print $2 }') 2> /dev/null"],
+    subprocess.call(
+        [
+            "kill -9 $(ps aux | grep default_worker.py | "
+            "grep -v grep | awk '{ print $2 }') 2> /dev/null"
+        ],
         shell=True)
 
     # Find the PID of the Ray log monitor process and kill it.
-    subprocess.call(["kill $(ps aux | grep log_monitor.py | grep -v grep | "
-                     "awk '{ print $2 }') 2> /dev/null"], shell=True)
+    subprocess.call(
+        [
+            "kill $(ps aux | grep log_monitor.py | grep -v grep | "
+            "awk '{ print $2 }') 2> /dev/null"
+        ],
+        shell=True)
 
     # Find the PID of the jupyter process and kill it.
     try:
         from notebook.notebookapp import list_running_servers
-        pids = [str(server["pid"]) for server in list_running_servers()
-                if "/tmp/raylogs" in server["notebook_dir"]]
-        subprocess.call(["kill {} 2> /dev/null".format(
-            " ".join(pids))], shell=True)
+        pids = [
+            str(server["pid"]) for server in list_running_servers()
+            if "/tmp/raylogs" in server["notebook_dir"]
+        ]
+        subprocess.call(
+            ["kill {} 2> /dev/null".format(" ".join(pids))], shell=True)
     except ImportError:
         pass
 
@@ -279,29 +358,41 @@ def stop():
 @click.command()
 @click.argument("cluster_config_file", required=True, type=str)
 @click.option(
-    "--no-restart", is_flag=True, default=False, help=(
-        "Whether to skip restarting Ray services during the update. "
+    "--no-restart",
+    is_flag=True,
+    default=False,
+    help=("Whether to skip restarting Ray services during the update. "
           "This avoids interrupting running jobs."))
 @click.option(
-    "--min-workers", required=False, type=int, help=(
-        "Override the configured min worker node count for the cluster."))
+    "--min-workers",
+    required=False,
+    type=int,
+    help=("Override the configured min worker node count for the cluster."))
 @click.option(
-    "--max-workers", required=False, type=int, help=(
-        "Override the configured max worker node count for the cluster."))
+    "--max-workers",
+    required=False,
+    type=int,
+    help=("Override the configured max worker node count for the cluster."))
 @click.option(
-    "--yes", "-y", is_flag=True, default=False, help=(
-        "Don't ask for confirmation."))
-def create_or_update(
-        cluster_config_file, min_workers, max_workers, no_restart, yes):
-    create_or_update_cluster(
-        cluster_config_file, min_workers, max_workers, no_restart, yes)
+    "--yes",
+    "-y",
+    is_flag=True,
+    default=False,
+    help=("Don't ask for confirmation."))
+def create_or_update(cluster_config_file, min_workers, max_workers, no_restart,
+                     yes):
+    create_or_update_cluster(cluster_config_file, min_workers, max_workers,
+                             no_restart, yes)
 
 
 @click.command()
 @click.argument("cluster_config_file", required=True, type=str)
 @click.option(
-    "--yes", "-y", is_flag=True, default=False, help=(
-        "Don't ask for confirmation."))
+    "--yes",
+    "-y",
+    is_flag=True,
+    default=False,
+    help=("Don't ask for confirmation."))
 def teardown(cluster_config_file, yes):
     teardown_cluster(cluster_config_file, yes)
 

python/ray/services.py

@@ -41,16 +41,12 @@ PROCESS_TYPE_WEB_UI = "web_ui"
 # important because it determines the order in which these processes will be
 # terminated when Ray exits, and certain orders will cause errors to be logged
 # to the screen.
-all_processes = OrderedDict([(PROCESS_TYPE_MONITOR, []),
-                             (PROCESS_TYPE_LOG_MONITOR, []),
-                             (PROCESS_TYPE_WORKER, []),
-                             (PROCESS_TYPE_RAYLET, []),
-                             (PROCESS_TYPE_LOCAL_SCHEDULER, []),
-                             (PROCESS_TYPE_PLASMA_MANAGER, []),
-                             (PROCESS_TYPE_PLASMA_STORE, []),
-                             (PROCESS_TYPE_GLOBAL_SCHEDULER, []),
-                             (PROCESS_TYPE_REDIS_SERVER, []),
-                             (PROCESS_TYPE_WEB_UI, [])],)
+all_processes = OrderedDict(
+    [(PROCESS_TYPE_MONITOR, []), (PROCESS_TYPE_LOG_MONITOR, []),
+     (PROCESS_TYPE_WORKER, []), (PROCESS_TYPE_RAYLET, []),
+     (PROCESS_TYPE_LOCAL_SCHEDULER, []), (PROCESS_TYPE_PLASMA_MANAGER, []),
+     (PROCESS_TYPE_PLASMA_STORE, []), (PROCESS_TYPE_GLOBAL_SCHEDULER, []),
+     (PROCESS_TYPE_REDIS_SERVER, []), (PROCESS_TYPE_WEB_UI, [])], )
 
 # True if processes are run in the valgrind profiler.
 RUN_RAYLET_PROFILER = False
@@ -82,17 +78,15 @@ RAYLET_MONITOR_EXECUTABLE = os.path.join(
     os.path.abspath(os.path.dirname(__file__)),
     "core/src/ray/raylet/raylet_monitor")
 RAYLET_EXECUTABLE = os.path.join(
-    os.path.abspath(os.path.dirname(__file__)),
-    "core/src/ray/raylet/raylet")
+    os.path.abspath(os.path.dirname(__file__)), "core/src/ray/raylet/raylet")
 
 # ObjectStoreAddress tuples contain all information necessary to connect to an
 # object store. The fields are:
 # - name: The socket name for the object store
 # - manager_name: The socket name for the object store manager
 # - manager_port: The Internet port that the object store manager listens on
-ObjectStoreAddress = namedtuple("ObjectStoreAddress", ["name",
-                                                       "manager_name",
-                                                       "manager_port"])
+ObjectStoreAddress = namedtuple("ObjectStoreAddress",
+                                ["name", "manager_name", "manager_port"])
 
 
 def address(ip_address, port):
@@ -133,8 +127,10 @@ def kill_process(p):
     if p.poll() is not None:
         # The process has already terminated.
         return True
-    if any([RUN_RAYLET_PROFILER, RUN_LOCAL_SCHEDULER_PROFILER,
-            RUN_PLASMA_MANAGER_PROFILER, RUN_PLASMA_STORE_PROFILER]):
+    if any([
+            RUN_RAYLET_PROFILER, RUN_LOCAL_SCHEDULER_PROFILER,
+            RUN_PLASMA_MANAGER_PROFILER, RUN_PLASMA_STORE_PROFILER
+    ]):
         # Give process signal to write profiler data.
         os.kill(p.pid, signal.SIGINT)
         # Wait for profiling data to be written.
@@ -260,8 +256,8 @@ def record_log_files_in_redis(redis_address, node_ip_address, log_files):
     for log_file in log_files:
         if log_file is not None:
             redis_ip_address, redis_port = redis_address.split(":")
-            redis_client = redis.StrictRedis(host=redis_ip_address,
-                                             port=redis_port)
+            redis_client = redis.StrictRedis(
+                host=redis_ip_address, port=redis_port)
             # The name of the key storing the list of log filenames for this IP
             # address.
             log_file_list_key = "LOG_FILENAMES:{}".format(node_ip_address)
@@ -304,8 +300,8 @@ def wait_for_redis_to_start(redis_ip_address, redis_port, num_retries=5):
     while counter < num_retries:
         try:
             # Run some random command and see if it worked.
-            print("Waiting for redis server at {}:{} to respond..."
-                  .format(redis_ip_address, redis_port))
+            print("Waiting for redis server at {}:{} to respond...".format(
+                redis_ip_address, redis_port))
             redis_client.client_list()
         except redis.ConnectionError as e:
             # Wait a little bit.
@@ -427,17 +423,19 @@ def start_credis(node_ip_address,
     """
 
     components = ["credis_master", "credis_head", "credis_tail"]
-    modules = [CREDIS_MASTER_MODULE, CREDIS_MEMBER_MODULE,
-               CREDIS_MEMBER_MODULE]
+    modules = [
+        CREDIS_MASTER_MODULE, CREDIS_MEMBER_MODULE, CREDIS_MEMBER_MODULE
+    ]
     ports = []
 
     for i, component in enumerate(components):
-        stdout_file, stderr_file = new_log_files(
-            component, redirect_output)
+        stdout_file, stderr_file = new_log_files(component, redirect_output)
 
         new_port, _ = start_redis_instance(
-            node_ip_address=node_ip_address, port=port,
-            stdout_file=stdout_file, stderr_file=stderr_file,
+            node_ip_address=node_ip_address,
+            port=port,
+            stdout_file=stdout_file,
+            stderr_file=stderr_file,
             cleanup=cleanup,
             module=modules[i],
             executable=CREDIS_EXECUTABLE)
@@ -456,8 +454,7 @@ def start_credis(node_ip_address,
 
     # Register credis master in redis
     redis_ip_address, redis_port = redis_address.split(":")
-    redis_client = redis.StrictRedis(host=redis_ip_address,
-                                     port=redis_port)
+    redis_client = redis.StrictRedis(host=redis_ip_address, port=redis_port)
     redis_client.set("credis_address", credis_address)
 
     return credis_address
@@ -509,9 +506,11 @@ def start_redis(node_ip_address,
                         "number of Redis shards.")
 
     assigned_port, _ = start_redis_instance(
-        node_ip_address=node_ip_address, port=port,
+        node_ip_address=node_ip_address,
+        port=port,
         redis_max_clients=redis_max_clients,
-        stdout_file=redis_stdout_file, stderr_file=redis_stderr_file,
+        stdout_file=redis_stdout_file,
+        stderr_file=redis_stderr_file,
         cleanup=cleanup)
     if port is not None:
         assert assigned_port == port
@@ -540,7 +539,8 @@ def start_redis(node_ip_address,
             node_ip_address=node_ip_address,
             port=redis_shard_ports[i],
             redis_max_clients=redis_max_clients,
-            stdout_file=redis_stdout_file, stderr_file=redis_stderr_file,
+            stdout_file=redis_stdout_file,
+            stderr_file=redis_stderr_file,
             cleanup=cleanup)
         if redis_shard_ports[i] is not None:
             assert redis_shard_port == redis_shard_ports[i]
@@ -601,11 +601,13 @@ def start_redis_instance(node_ip_address="127.0.0.1",
     while counter < num_retries:
         if counter > 0:
             print("Redis failed to start, retrying now.")
-        p = subprocess.Popen([executable,
-                              "--port", str(port),
-                              "--loglevel", "warning",
-                              "--loadmodule", module],
-                             stdout=stdout_file, stderr=stderr_file)
+        p = subprocess.Popen(
+            [
+                executable, "--port",
+                str(port), "--loglevel", "warning", "--loadmodule", module
+            ],
+            stdout=stdout_file,
+            stderr=stderr_file)
         time.sleep(0.1)
         # Check if Redis successfully started (or at least if it the executable
         # did not exit within 0.1 seconds).
@@ -652,8 +654,8 @@ def start_redis_instance(node_ip_address="127.0.0.1",
     # Increase the hard and soft limits for the redis client pubsub buffer to
     # 128MB. This is a hack to make it less likely for pubsub messages to be
     # dropped and for pubsub connections to therefore be killed.
-    cur_config = (redis_client.config_get("client-output-buffer-limit")
-                  ["client-output-buffer-limit"])
+    cur_config = (redis_client.config_get("client-output-buffer-limit")[
+        "client-output-buffer-limit"])
     cur_config_list = cur_config.split()
     assert len(cur_config_list) == 12
     cur_config_list[8:] = ["pubsub", "134217728", "134217728", "60"]
@@ -662,13 +664,17 @@ def start_redis_instance(node_ip_address="127.0.0.1",
     # Put a time stamp in Redis to indicate when it was started.
     redis_client.set("redis_start_time", time.time())
     # Record the log files in Redis.
-    record_log_files_in_redis(address(node_ip_address, port), node_ip_address,
+    record_log_files_in_redis(
+        address(node_ip_address, port), node_ip_address,
         [stdout_file, stderr_file])
     return port, p
 
 
-def start_log_monitor(redis_address, node_ip_address, stdout_file=None,
-                      stderr_file=None, cleanup=cleanup):
+def start_log_monitor(redis_address,
+                      node_ip_address,
+                      stdout_file=None,
+                      stderr_file=None,
+                      cleanup=cleanup):
     """Start a log monitor process.
 
     Args:
@@ -684,20 +690,25 @@ def start_log_monitor(redis_address, node_ip_address, stdout_file=None,
             Python process that imported services exits.
     """
     log_monitor_filepath = os.path.join(
-        os.path.dirname(os.path.abspath(__file__)),
-        "log_monitor.py")
-    p = subprocess.Popen([sys.executable, "-u", log_monitor_filepath,
-                          "--redis-address", redis_address,
-                          "--node-ip-address", node_ip_address],
-                         stdout=stdout_file, stderr=stderr_file)
+        os.path.dirname(os.path.abspath(__file__)), "log_monitor.py")
+    p = subprocess.Popen(
+        [
+            sys.executable, "-u", log_monitor_filepath, "--redis-address",
+            redis_address, "--node-ip-address", node_ip_address
+        ],
+        stdout=stdout_file,
+        stderr=stderr_file)
     if cleanup:
         all_processes[PROCESS_TYPE_LOG_MONITOR].append(p)
     record_log_files_in_redis(redis_address, node_ip_address,
                               [stdout_file, stderr_file])
 
 
-def start_global_scheduler(redis_address, node_ip_address,
-                           stdout_file=None, stderr_file=None, cleanup=True):
+def start_global_scheduler(redis_address,
+                           node_ip_address,
+                           stdout_file=None,
+                           stderr_file=None,
+                           cleanup=True):
     """Start a global scheduler process.
 
     Args:
@@ -712,7 +723,8 @@ def start_global_scheduler(redis_address, node_ip_address,
             then this process will be killed by services.cleanup() when the
             Python process that imported services exits.
     """
-    p = global_scheduler.start_global_scheduler(redis_address,
+    p = global_scheduler.start_global_scheduler(
+        redis_address,
         node_ip_address,
         stdout_file=stdout_file,
         stderr_file=stderr_file)
@@ -737,8 +749,7 @@ def start_ui(redis_address, stdout_file=None, stderr_file=None, cleanup=True):
     """
     new_env = os.environ.copy()
     notebook_filepath = os.path.join(
-        os.path.dirname(os.path.abspath(__file__)),
-        "WebUI.ipynb")
+        os.path.dirname(os.path.abspath(__file__)), "WebUI.ipynb")
     # We copy the notebook file so that the original doesn't get modified by
     # the user.
     random_ui_id = random.randint(0, 100000)
@@ -759,19 +770,23 @@ def start_ui(redis_address, stdout_file=None, stderr_file=None, cleanup=True):
     # We generate the token used for authentication ourselves to avoid
     # querying the jupyter server.
     token = binascii.hexlify(os.urandom(24)).decode("ascii")
-    command = ["jupyter", "notebook", "--no-browser",
-               "--port={}".format(port),
+    command = [
+        "jupyter", "notebook", "--no-browser", "--port={}".format(port),
         "--NotebookApp.iopub_data_rate_limit=10000000000",
         "--NotebookApp.open_browser=False",
-               "--NotebookApp.token={}".format(token)]
+        "--NotebookApp.token={}".format(token)
+    ]
     # If the user is root, add the --allow-root flag.
     if os.geteuid() == 0:
         command.append("--allow-root")
 
     try:
-        ui_process = subprocess.Popen(command, env=new_env,
+        ui_process = subprocess.Popen(
+            command,
+            env=new_env,
             cwd=new_notebook_directory,
-                                      stdout=stdout_file, stderr=stderr_file)
+            stdout=stdout_file,
+            stderr=stderr_file)
     except Exception:
         print("Failed to start the UI, you may need to run "
               "'pip install jupyter'.")
@@ -836,8 +851,8 @@ def start_local_scheduler(redis_address,
 
     # Check that the number of GPUs that the local scheduler wants doesn't
     # excede the amount allowed by CUDA_VISIBLE_DEVICES.
-    if ("GPU" in resources and gpu_ids is not None and
-            resources["GPU"] > len(gpu_ids)):
+    if ("GPU" in resources and gpu_ids is not None
+            and resources["GPU"] > len(gpu_ids)):
         raise Exception("Attempting to start local scheduler with {} GPUs, "
                         "but CUDA_VISIBLE_DEVICES contains {}.".format(
                             resources["GPU"], gpu_ids))
@@ -906,21 +921,14 @@ def start_raylet(redis_address,
                             "--node-ip-address={} "
                             "--object-store-name={} "
                             "--raylet-name={} "
-                            "--redis-address={}"
-                            .format(sys.executable,
-                                    worker_path,
-                                    node_ip_address,
-                                    plasma_store_name,
-                                    raylet_name,
-                                    redis_address))
+                            "--redis-address={}".format(
+                                sys.executable, worker_path, node_ip_address,
+                                plasma_store_name, raylet_name, redis_address))
 
-    command = [RAYLET_EXECUTABLE,
-               raylet_name,
-               plasma_store_name,
-               node_ip_address,
-               gcs_ip_address,
-               gcs_port,
-               start_worker_command]
+    command = [
+        RAYLET_EXECUTABLE, raylet_name, plasma_store_name, node_ip_address,
+        gcs_ip_address, gcs_port, start_worker_command
+    ]
     pid = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)
 
     if cleanup:
@@ -931,12 +939,18 @@ def start_raylet(redis_address,
     return raylet_name
 
 
-def start_objstore(node_ip_address, redis_address,
-                   object_manager_port=None, store_stdout_file=None,
-                   store_stderr_file=None, manager_stdout_file=None,
-                   manager_stderr_file=None, objstore_memory=None,
-                   cleanup=True, plasma_directory=None,
-                   huge_pages=False, use_raylet=False):
+def start_objstore(node_ip_address,
+                   redis_address,
+                   object_manager_port=None,
+                   store_stdout_file=None,
+                   store_stderr_file=None,
+                   manager_stdout_file=None,
+                   manager_stderr_file=None,
+                   objstore_memory=None,
+                   cleanup=True,
+                   plasma_directory=None,
+                   huge_pages=False,
+                   use_raylet=False):
     """This method starts an object store process.
 
     Args:
@@ -1049,9 +1063,15 @@ def start_objstore(node_ip_address, redis_address,
                               plasma_manager_port)
 
 
-def start_worker(node_ip_address, object_store_name, object_store_manager_name,
-                 local_scheduler_name, redis_address, worker_path,
-                 stdout_file=None, stderr_file=None, cleanup=True):
+def start_worker(node_ip_address,
+                 object_store_name,
+                 object_store_manager_name,
+                 local_scheduler_name,
+                 redis_address,
+                 worker_path,
+                 stdout_file=None,
+                 stderr_file=None,
+                 cleanup=True):
     """This method starts a worker process.
 
     Args:
@@ -1072,14 +1092,14 @@ def start_worker(node_ip_address, object_store_name, object_store_manager_name,
             Python process that imported services exits. This is True by
             default.
     """
-    command = [sys.executable,
-               "-u",
-               worker_path,
+    command = [
+        sys.executable, "-u", worker_path,
         "--node-ip-address=" + node_ip_address,
         "--object-store-name=" + object_store_name,
         "--object-store-manager-name=" + object_store_manager_name,
         "--local-scheduler-name=" + local_scheduler_name,
-               "--redis-address=" + str(redis_address)]
+        "--redis-address=" + str(redis_address)
+    ]
     p = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)
     if cleanup:
         all_processes[PROCESS_TYPE_WORKER].append(p)
@@ -1087,8 +1107,12 @@ def start_worker(node_ip_address, object_store_name, object_store_manager_name,
                               [stdout_file, stderr_file])
 
 
-def start_monitor(redis_address, node_ip_address, stdout_file=None,
-                  stderr_file=None, cleanup=True, autoscaling_config=None):
+def start_monitor(redis_address,
+                  node_ip_address,
+                  stdout_file=None,
+                  stderr_file=None,
+                  cleanup=True,
+                  autoscaling_config=None):
     """Run a process to monitor the other processes.
 
     Args:
@@ -1105,12 +1129,12 @@ def start_monitor(redis_address, node_ip_address, stdout_file=None,
             default.
         autoscaling_config: path to autoscaling config file.
     """
-    monitor_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),
-                                "monitor.py")
-    command = [sys.executable,
-               "-u",
-               monitor_path,
-               "--redis-address=" + str(redis_address)]
+    monitor_path = os.path.join(
+        os.path.dirname(os.path.abspath(__file__)), "monitor.py")
+    command = [
+        sys.executable, "-u", monitor_path,
+        "--redis-address=" + str(redis_address)
+    ]
     if autoscaling_config:
         command.append("--autoscaling-config=" + str(autoscaling_config))
     p = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)
@@ -1120,8 +1144,10 @@ def start_monitor(redis_address, node_ip_address, stdout_file=None,
                               [stdout_file, stderr_file])
 
 
-def start_raylet_monitor(redis_address, stdout_file=None,
-                         stderr_file=None, cleanup=True):
+def start_raylet_monitor(redis_address,
+                         stdout_file=None,
+                         stderr_file=None,
+                         cleanup=True):
     """Run a process to monitor the other processes.
 
     Args:
@@ -1136,9 +1162,7 @@ def start_raylet_monitor(redis_address, stdout_file=None,
             default.
     """
     gcs_ip_address, gcs_port = redis_address.split(":")
-    command = [RAYLET_MONITOR_EXECUTABLE,
-               gcs_ip_address,
-               gcs_port]
+    command = [RAYLET_MONITOR_EXECUTABLE, gcs_ip_address, gcs_port]
     p = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)
     if cleanup:
         all_processes[PROCESS_TYPE_MONITOR].append(p)
@@ -1238,15 +1262,16 @@ def start_ray_processes(address_info=None,
         workers_per_local_scheduler = []
         for resource_dict in resources:
             cpus = resource_dict.get("CPU")
-            workers_per_local_scheduler.append(cpus if cpus is not None
-                                               else psutil.cpu_count())
+            workers_per_local_scheduler.append(cpus if cpus is not None else
+                                               psutil.cpu_count())
 
     if address_info is None:
         address_info = {}
     address_info["node_ip_address"] = node_ip_address
 
     if worker_path is None:
-        worker_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),
+        worker_path = os.path.join(
+            os.path.dirname(os.path.abspath(__file__)),
             "workers/default_worker.py")
 
     # Start Redis if there isn't already an instance running. TODO(rkn): We are
@@ -1257,7 +1282,8 @@ def start_ray_processes(address_info=None,
     redis_shards = address_info.get("redis_shards", [])
     if redis_address is None:
         redis_address, redis_shards = start_redis(
-            node_ip_address, port=redis_port,
+            node_ip_address,
+            port=redis_port,
             redis_shard_ports=redis_shard_ports,
             num_redis_shards=num_redis_shards,
             redis_max_clients=redis_max_clients,
@@ -1274,14 +1300,16 @@ def start_ray_processes(address_info=None,
         # Start monitoring the processes.
         monitor_stdout_file, monitor_stderr_file = new_log_files(
             "monitor", redirect_output)
-        start_monitor(redis_address,
+        start_monitor(
+            redis_address,
             node_ip_address,
             stdout_file=monitor_stdout_file,
             stderr_file=monitor_stderr_file,
             cleanup=cleanup,
             autoscaling_config=autoscaling_config)
         if use_raylet:
-            start_raylet_monitor(redis_address,
+            start_raylet_monitor(
+                redis_address,
                 stdout_file=monitor_stdout_file,
                 stderr_file=monitor_stderr_file,
                 cleanup=cleanup)
@@ -1289,8 +1317,8 @@ def start_ray_processes(address_info=None,
     if redis_shards == []:
         # Get redis shards from primary redis instance.
         redis_ip_address, redis_port = redis_address.split(":")
-        redis_client = redis.StrictRedis(host=redis_ip_address,
-                                         port=redis_port)
+        redis_client = redis.StrictRedis(
+            host=redis_ip_address, port=redis_port)
         redis_shards = redis_client.lrange("RedisShards", start=0, end=-1)
         redis_shards = [shard.decode("ascii") for shard in redis_shards]
         address_info["redis_shards"] = redis_shards
@@ -1299,7 +1327,8 @@ def start_ray_processes(address_info=None,
     if include_log_monitor:
         log_monitor_stdout_file, log_monitor_stderr_file = new_log_files(
             "log_monitor", redirect_output=True)
-        start_log_monitor(redis_address,
+        start_log_monitor(
+            redis_address,
             node_ip_address,
             stdout_file=log_monitor_stdout_file,
             stderr_file=log_monitor_stderr_file,
@@ -1309,7 +1338,8 @@ def start_ray_processes(address_info=None,
     if include_global_scheduler and not use_raylet:
         global_scheduler_stdout_file, global_scheduler_stderr_file = (
             new_log_files("global_scheduler", redirect_output))
-        start_global_scheduler(redis_address,
+        start_global_scheduler(
+            redis_address,
             node_ip_address,
             stdout_file=global_scheduler_stdout_file,
             stderr_file=global_scheduler_stderr_file,
@@ -1324,9 +1354,8 @@ def start_ray_processes(address_info=None,
     local_scheduler_socket_names = address_info["local_scheduler_socket_names"]
 
     # Get the ports to use for the object managers if any are provided.
-    object_manager_ports = (address_info["object_manager_ports"]
-                            if "object_manager_ports" in address_info
-                            else None)
+    object_manager_ports = (address_info["object_manager_ports"] if
+                            "object_manager_ports" in address_info else None)
     if not isinstance(object_manager_ports, list):
         object_manager_ports = num_local_schedulers * [object_manager_ports]
     assert len(object_manager_ports) == num_local_schedulers
@@ -1347,7 +1376,8 @@ def start_ray_processes(address_info=None,
             manager_stdout_file=plasma_manager_stdout_file,
             manager_stderr_file=plasma_manager_stderr_file,
             objstore_memory=object_store_memory,
-            cleanup=cleanup, plasma_directory=plasma_directory,
+            cleanup=cleanup,
+            plasma_directory=plasma_directory,
             huge_pages=huge_pages,
             use_raylet=use_raylet)
         object_store_addresses.append(object_store_address)
@@ -1355,8 +1385,8 @@ def start_ray_processes(address_info=None,
 
     # Start any local schedulers that do not yet exist.
     if not use_raylet:
-        for i in range(len(local_scheduler_socket_names),
-                       num_local_schedulers):
+        for i in range(
+                len(local_scheduler_socket_names), num_local_schedulers):
             # Connect the local scheduler to the object store at the same
             # index.
             object_store_address = object_store_addresses[i]
@@ -1374,7 +1404,8 @@ def start_ray_processes(address_info=None,
             # redirect the worker output, then we cannot redirect the local
             # scheduler output.
             local_scheduler_stdout_file, local_scheduler_stderr_file = (
-                new_log_files("local_scheduler_{}".format(i),
+                new_log_files(
+                    "local_scheduler_{}".format(i),
                     redirect_output=redirect_worker_output))
             local_scheduler_name = start_local_scheduler(
                 redis_address,
@@ -1398,17 +1429,18 @@ def start_ray_processes(address_info=None,
     else:
         # Start the raylet. TODO(rkn): Modify this to allow starting
         # multiple raylets on the same machine.
-        raylet_stdout_file, raylet_stderr_file = (
-            new_log_files("raylet_{}".format(i),
-                          redirect_output=redirect_output))
-        address_info["raylet_socket_names"] = [start_raylet(
+        raylet_stdout_file, raylet_stderr_file = (new_log_files(
+            "raylet_{}".format(i), redirect_output=redirect_output))
+        address_info["raylet_socket_names"] = [
+            start_raylet(
                 redis_address,
                 node_ip_address,
                 object_store_addresses[i].name,
                 worker_path,
                 stdout_file=None,
                 stderr_file=None,
-            cleanup=cleanup)]
+                cleanup=cleanup)
+        ]
 
     if not use_raylet:
         # Start any workers that the local scheduler has not already started.
@@ -1419,7 +1451,8 @@ def start_ray_processes(address_info=None,
             for j in range(num_local_scheduler_workers):
                 worker_stdout_file, worker_stderr_file = new_log_files(
                     "worker_{}_{}".format(i, j), redirect_output)
-                start_worker(node_ip_address,
+                start_worker(
+                    node_ip_address,
                     object_store_address.name,
                     object_store_address.manager_name,
                     local_scheduler_name,
@@ -1431,13 +1464,14 @@ def start_ray_processes(address_info=None,
                 workers_per_local_scheduler[i] -= 1
 
         # Make sure that we've started all the workers.
-        assert(sum(workers_per_local_scheduler) == 0)
+        assert (sum(workers_per_local_scheduler) == 0)
 
     # Try to start the web UI.
     if include_webui:
         ui_stdout_file, ui_stderr_file = new_log_files(
             "webui", redirect_output=True)
-        address_info["webui_url"] = start_ui(redis_address,
+        address_info["webui_url"] = start_ui(
+            redis_address,
             stdout_file=ui_stdout_file,
             stderr_file=ui_stderr_file,
             cleanup=cleanup)
@@ -1500,9 +1534,12 @@ def start_ray_node(node_ip_address,
         A dictionary of the address information for the processes that were
             started.
     """
-    address_info = {"redis_address": redis_address,
-                    "object_manager_ports": object_manager_ports}
-    return start_ray_processes(address_info=address_info,
+    address_info = {
+        "redis_address": redis_address,
+        "object_manager_ports": object_manager_ports
+    }
+    return start_ray_processes(
+        address_info=address_info,
         node_ip_address=node_ip_address,
         num_workers=num_workers,
         num_local_schedulers=num_local_schedulers,

python/ray/signature.py

@@ -7,11 +7,10 @@ import funcsigs
 
 from ray.utils import is_cython
 
-FunctionSignature = namedtuple("FunctionSignature", ["arg_names",
-                                                     "arg_defaults",
-                                                     "arg_is_positionals",
-                                                     "keyword_names",
-                                                     "function_name"])
+FunctionSignature = namedtuple("FunctionSignature", [
+    "arg_names", "arg_defaults", "arg_is_positionals", "keyword_names",
+    "function_name"
+])
 """This class is used to represent a function signature.
 
 Attributes:
@@ -49,13 +48,16 @@ def get_signature_params(func):
     # The first condition for Cython functions, the latter for Cython instance
     # methods
     if is_cython(func):
-        attrs = ["__code__", "__annotations__",
-                 "__defaults__", "__kwdefaults__"]
+        attrs = [
+            "__code__", "__annotations__", "__defaults__", "__kwdefaults__"
+        ]
 
         if all([hasattr(func, attr) for attr in attrs]):
             original_func = func
 
-            def func(): return
+            def func():
+                return
+
             for attr in attrs:
                 setattr(func, attr, getattr(original_func, attr))
         else:
@@ -130,8 +132,8 @@ def extract_signature(func, ignore_first=False):
     if ignore_first:
         if len(sig_params) == 0:
             raise Exception("Methods must take a 'self' argument, but the "
-                            "method '{}' does not have one."
-                            .format(func.__name__))
+                            "method '{}' does not have one.".format(
+                                func.__name__))
         sig_params = sig_params[1:]
 
     # Extract the names of the keyword arguments.
@@ -183,8 +185,8 @@ def extend_args(function_signature, args, kwargs):
     for keyword_name in kwargs:
         if keyword_name not in keyword_names:
             raise Exception("The name '{}' is not a valid keyword argument "
-                            "for the function '{}'."
-                            .format(keyword_name, function_name))
+                            "for the function '{}'.".format(
+                                keyword_name, function_name))
 
     # Fill in the remaining arguments.
     zipped_info = list(zip(arg_names, arg_defaults,
@@ -201,12 +203,12 @@ def extend_args(function_signature, args, kwargs):
                 # can be omitted.
                 if not is_positional:
                     raise Exception("No value was provided for the argument "
-                                    "'{}' for the function '{}'."
-                                    .format(keyword_name, function_name))
+                                    "'{}' for the function '{}'.".format(
+                                        keyword_name, function_name))
 
-    too_many_arguments = (len(args) > len(arg_names) and
-                          (len(arg_is_positionals) == 0 or
-                           not arg_is_positionals[-1]))
+    too_many_arguments = (len(args) > len(arg_names)
+                          and (len(arg_is_positionals) == 0
+                               or not arg_is_positionals[-1]))
     if too_many_arguments:
         raise Exception("Too many arguments were passed to the function '{}'"
                         .format(function_name))

python/ray/test/test_functions.py

@@ -13,6 +13,7 @@ import numpy as np
 def handle_int(a, b):
     return a + 1, b + 1
 
+
 # Test timing
 
 
@@ -25,6 +26,7 @@ def empty_function():
 def trivial_function():
     return 1
 
+
 # Test keyword arguments
 
 
@@ -42,6 +44,7 @@ def keyword_fct2(a="hello", b="world"):
 def keyword_fct3(a, b, c="hello", d="world"):
     return "{} {} {} {}".format(a, b, c, d)
 
+
 # Test variable numbers of arguments
 
 
@@ -56,17 +59,21 @@ def varargs_fct2(a, *b):
 
 
 try:
+
     @ray.remote
     def kwargs_throw_exception(**c):
         return ()
+
     kwargs_exception_thrown = False
 except Exception:
     kwargs_exception_thrown = True
 
 try:
+
     @ray.remote
     def varargs_and_kwargs_throw_exception(a, b="hi", *c):
         return "{} {} {}".format(a, b, c)
+
     varargs_and_kwargs_exception_thrown = False
 except Exception:
     varargs_and_kwargs_exception_thrown = True
@@ -88,6 +95,7 @@ def throw_exception_fct2():
 def throw_exception_fct3(x):
     raise Exception("Test function 3 intentionally failed.")
 
+
 # test Python mode
 
 
@@ -101,6 +109,7 @@ def python_mode_g(x):
     x[0] = 1
     return x
 
+
 # test no return values
 
 

python/ray/test/test_utils.py

@@ -48,8 +48,8 @@ def _wait_for_nodes_to_join(num_nodes, timeout=20):
         if num_ready_nodes > num_nodes:
             # Too many nodes have joined. Something must be wrong.
             raise Exception("{} nodes have joined the cluster, but we were "
-                            "expecting {} nodes.".format(num_ready_nodes,
-                                                         num_nodes))
+                            "expecting {} nodes.".format(
+                                num_ready_nodes, num_nodes))
         time.sleep(0.1)
 
     # If we get here then we timed out.

python/ray/tune/__init__.py

@@ -9,14 +9,7 @@ from ray.tune.result import TrainingResult
 from ray.tune.trainable import Trainable
 from ray.tune.variant_generator import grid_search
 
-
 __all__ = [
-    "Trainable",
-    "TrainingResult",
-    "TuneError",
-    "grid_search",
-    "register_env",
-    "register_trainable",
-    "run_experiments",
-    "Experiment"
+    "Trainable", "TrainingResult", "TuneError", "grid_search", "register_env",
+    "register_trainable", "run_experiments", "Experiment"
 ]

python/ray/tune/async_hyperband.py

@@ -35,10 +35,13 @@ class AsyncHyperBandScheduler(FIFOScheduler):
             halving rate, specified by the reduction factor.
     """
 
-    def __init__(
-            self, time_attr='training_iteration',
-            reward_attr='episode_reward_mean', max_t=100,
-            grace_period=10, reduction_factor=3, brackets=3):
+    def __init__(self,
+                 time_attr='training_iteration',
+                 reward_attr='episode_reward_mean',
+                 max_t=100,
+                 grace_period=10,
+                 reduction_factor=3,
+                 brackets=3):
         assert max_t > 0, "Max (time_attr) not valid!"
         assert max_t >= grace_period, "grace_period must be <= max_t!"
         assert grace_period > 0, "grace_period must be positive!"
@@ -51,8 +54,10 @@ class AsyncHyperBandScheduler(FIFOScheduler):
         self._trial_info = {}  # Stores Trial -> Bracket
 
         # Tracks state for new trial add
-        self._brackets = [_Bracket(
-            grace_period, max_t, reduction_factor, s) for s in range(brackets)]
+        self._brackets = [
+            _Bracket(grace_period, max_t, reduction_factor, s)
+            for s in range(brackets)
+        ]
         self._counter = 0  # for
         self._num_stopped = 0
         self._reward_attr = reward_attr
@@ -60,7 +65,7 @@ class AsyncHyperBandScheduler(FIFOScheduler):
 
     def on_trial_add(self, trial_runner, trial):
         sizes = np.array([len(b._rungs) for b in self._brackets])
-        probs = np.e ** (sizes - sizes.max())
+        probs = np.e**(sizes - sizes.max())
         normalized = probs / probs.sum()
         idx = np.random.choice(len(self._brackets), p=normalized)
         self._trial_info[trial.trial_id] = self._brackets[idx]
@@ -71,9 +76,7 @@ class AsyncHyperBandScheduler(FIFOScheduler):
             action = TrialScheduler.STOP
         else:
             bracket = self._trial_info[trial.trial_id]
-            action = bracket.on_result(
-                trial,
-                getattr(result, self._time_attr),
+            action = bracket.on_result(trial, getattr(result, self._time_attr),
                                        getattr(result, self._reward_attr))
         if action == TrialScheduler.STOP:
             self._num_stopped += 1
@@ -81,9 +84,7 @@ class AsyncHyperBandScheduler(FIFOScheduler):
 
     def on_trial_complete(self, trial_runner, trial, result):
         bracket = self._trial_info[trial.trial_id]
-        bracket.on_result(
-            trial,
-            getattr(result, self._time_attr),
+        bracket.on_result(trial, getattr(result, self._time_attr),
                           getattr(result, self._reward_attr))
         del self._trial_info[trial.trial_id]
 
@@ -91,8 +92,7 @@ class AsyncHyperBandScheduler(FIFOScheduler):
         del self._trial_info[trial.trial_id]
 
     def debug_string(self):
-        out = "Using AsyncHyperBand: num_stopped={}".format(
-            self._num_stopped)
+        out = "Using AsyncHyperBand: num_stopped={}".format(self._num_stopped)
         out += "\n" + "\n".join([b.debug_str() for b in self._brackets])
         return out
 
@@ -111,6 +111,7 @@ class _Bracket():
         >>> b.on_result(trial3, 1, 1)  # STOP
         >>> b.cutoff(b._rungs[0][1]) == 2.0
     """
+
     def __init__(self, min_t, max_t, reduction_factor, s):
         self.rf = reduction_factor
         MAX_RUNGS = int(np.log(max_t / min_t) / np.log(self.rf) - s + 1)
@@ -140,9 +141,10 @@ class _Bracket():
         return action
 
     def debug_str(self):
-        iters = " | ".join(
-            ["Iter {:.3f}: {}".format(milestone, self.cutoff(recorded))
-             for milestone, recorded in self._rungs])
+        iters = " | ".join([
+            "Iter {:.3f}: {}".format(milestone, self.cutoff(recorded))
+            for milestone, recorded in self._rungs
+        ])
         return "Bracket: " + iters
 
 

python/ray/tune/config_parser.py

@@ -2,7 +2,6 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
-
 import argparse
 import json
 
@@ -24,8 +23,8 @@ def json_to_resources(data):
                 "Unknown resource type {}, must be one of {}".format(
                     k, Resources._fields))
     return Resources(
-        data.get("cpu", 1), data.get("gpu", 0),
-        data.get("extra_cpu", 0), data.get("extra_gpu", 0))
+        data.get("cpu", 1), data.get("gpu", 0), data.get("extra_cpu", 0),
+        data.get("extra_gpu", 0))
 
 
 def resources_to_json(resources):
@@ -50,59 +49,85 @@ def make_parser(**kwargs):
 
     # Note: keep this in sync with rllib/train.py
     parser.add_argument(
-        "--run", default=None, type=str,
+        "--run",
+        default=None,
+        type=str,
         help="The algorithm or model to train. This may refer to the name "
         "of a built-on algorithm (e.g. RLLib's DQN or PPO), or a "
         "user-defined trainable function or class registered in the "
         "tune registry.")
     parser.add_argument(
-        "--stop", default="{}", type=json.loads,
+        "--stop",
+        default="{}",
+        type=json.loads,
         help="The stopping criteria, specified in JSON. The keys may be any "
         "field in TrainingResult, e.g. "
         "'{\"time_total_s\": 600, \"timesteps_total\": 100000}' to stop "
         "after 600 seconds or 100k timesteps, whichever is reached first.")
     parser.add_argument(
-        "--config", default="{}", type=json.loads,
+        "--config",
+        default="{}",
+        type=json.loads,
         help="Algorithm-specific configuration (e.g. env, hyperparams), "
         "specified in JSON.")
     parser.add_argument(
-        "--resources", help="Deprecated, use --trial-resources.",
-        type=lambda v: _tune_error(
-            "The `resources` argument is no longer supported. "
-            "Use `trial_resources` or --trial-resources instead."))
+        "--resources",
+        help="Deprecated, use --trial-resources.",
+        type=lambda v: _tune_error("The `resources` argument is no longer "
+                                   "supported. Use `trial_resources` or "
+                                   "--trial-resources instead."))
     parser.add_argument(
-        "--trial-resources", default='{"cpu": 1}', type=json_to_resources,
+        "--trial-resources",
+        default='{"cpu": 1}',
+        type=json_to_resources,
         help="Machine resources to allocate per trial, e.g. "
         "'{\"cpu\": 64, \"gpu\": 8}'. Note that GPUs will not be assigned "
         "unless you specify them here.")
     parser.add_argument(
-        "--repeat", default=1, type=int,
+        "--repeat",
+        default=1,
+        type=int,
         help="Number of times to repeat each trial.")
     parser.add_argument(
-        "--local-dir", default=DEFAULT_RESULTS_DIR, type=str,
+        "--local-dir",
+        default=DEFAULT_RESULTS_DIR,
+        type=str,
         help="Local dir to save training results to. Defaults to '{}'.".format(
             DEFAULT_RESULTS_DIR))
     parser.add_argument(
-        "--upload-dir", default="", type=str,
+        "--upload-dir",
+        default="",
+        type=str,
         help="Optional URI to sync training results to (e.g. s3://bucket).")
     parser.add_argument(
-        "--checkpoint-freq", default=0, type=int,
+        "--checkpoint-freq",
+        default=0,
+        type=int,
         help="How many training iterations between checkpoints. "
         "A value of 0 (default) disables checkpointing.")
     parser.add_argument(
-        "--max-failures", default=3, type=int,
+        "--max-failures",
+        default=3,
+        type=int,
         help="Try to recover a trial from its last checkpoint at least this "
         "many times. Only applies if checkpointing is enabled.")
     parser.add_argument(
-        "--scheduler", default="FIFO", type=str,
+        "--scheduler",
+        default="FIFO",
+        type=str,
         help="FIFO (default), MedianStopping, AsyncHyperBand,"
         "HyperBand, or HyperOpt.")
     parser.add_argument(
-        "--scheduler-config", default="{}", type=json.loads,
+        "--scheduler-config",
+        default="{}",
+        type=json.loads,
         help="Config options to pass to the scheduler.")
 
     # Note: this currently only makes sense when running a single trial
-    parser.add_argument("--restore", default=None, type=str,
+    parser.add_argument(
+        "--restore",
+        default=None,
+        type=str,
         help="If specified, restore from this checkpoint.")
 
     return parser

python/ray/tune/examples/async_hyperband_example.py

@@ -60,18 +60,27 @@ if __name__ == "__main__":
     # `episode_reward_mean` as the
     # objective and `timesteps_total` as the time unit.
     ahb = AsyncHyperBandScheduler(
-        time_attr="timesteps_total", reward_attr="episode_reward_mean",
-        grace_period=5, max_t=100)
+        time_attr="timesteps_total",
+        reward_attr="episode_reward_mean",
+        grace_period=5,
+        max_t=100)
 
-    run_experiments({
+    run_experiments(
+        {
             "asynchyperband_test": {
                 "run": "my_class",
-            "stop": {"training_iteration": 1 if args.smoke_test else 99999},
+                "stop": {
+                    "training_iteration": 1 if args.smoke_test else 99999
+                },
                 "repeat": 20,
-            "trial_resources": {"cpu": 1, "gpu": 0},
+                "trial_resources": {
+                    "cpu": 1,
+                    "gpu": 0
+                },
                 "config": {
                     "width": lambda spec: 10 + int(90 * random.random()),
                     "height": lambda spec: int(100 * random.random()),
                 },
             }
-    }, scheduler=ahb)
+        },
+        scheduler=ahb)

python/ray/tune/examples/hyperband_example.py

@@ -59,7 +59,8 @@ if __name__ == "__main__":
     # Hyperband early stopping, configured with `episode_reward_mean` as the
     # objective and `timesteps_total` as the time unit.
     hyperband = HyperBandScheduler(
-        time_attr="timesteps_total", reward_attr="episode_reward_mean",
+        time_attr="timesteps_total",
+        reward_attr="episode_reward_mean",
         max_t=100)
 
     exp = Experiment(

python/ray/tune/examples/hyperopt_example.py

@@ -12,8 +12,8 @@ def easy_objective(config, reporter):
     time.sleep(0.2)
     reporter(
         timesteps_total=1,
-        episode_reward_mean=-((config["height"]-14) ** 2
-                              + abs(config["width"]-3)))
+        episode_reward_mean=-(
+            (config["height"] - 14)**2 + abs(config["width"] - 3)))
     time.sleep(0.2)
 
 
@@ -34,12 +34,18 @@ if __name__ == '__main__':
         'height': hp.uniform('height', -100, 100),
     }
 
-    config = {"my_exp": {
+    config = {
+        "my_exp": {
             "run": "exp",
             "repeat": 5 if args.smoke_test else 1000,
-            "stop": {"training_iteration": 1},
+            "stop": {
+                "training_iteration": 1
+            },
             "config": {
-                "space": space}}}
+                "space": space
+            }
+        }
+    }
     hpo_sched = HyperOptScheduler()
 
     run_experiments(config, verbose=False, scheduler=hpo_sched)

python/ray/tune/examples/pbt_example.py

@@ -42,8 +42,11 @@ class MyTrainableClass(Trainable):
     def _save(self, checkpoint_dir):
         path = os.path.join(checkpoint_dir, "checkpoint")
         with open(path, "w") as f:
-            f.write(json.dumps(
-                {"timestep": self.timestep, "value": self.current_value}))
+            f.write(
+                json.dumps({
+                    "timestep": self.timestep,
+                    "value": self.current_value
+                }))
         return path
 
     def _restore(self, checkpoint_path):
@@ -63,7 +66,8 @@ if __name__ == "__main__":
     ray.init()
 
     pbt = PopulationBasedTraining(
-        time_attr="training_iteration", reward_attr="episode_reward_mean",
+        time_attr="training_iteration",
+        reward_attr="episode_reward_mean",
         perturbation_interval=10,
         hyperparam_mutations={
             # Allow for scaling-based perturbations, with a uniform backing
@@ -74,15 +78,23 @@ if __name__ == "__main__":
         })
 
     # Try to find the best factor 1 and factor 2
-    run_experiments({
+    run_experiments(
+        {
             "pbt_test": {
                 "run": "my_class",
-            "stop": {"training_iteration": 2 if args.smoke_test else 99999},
+                "stop": {
+                    "training_iteration": 2 if args.smoke_test else 99999
+                },
                 "repeat": 10,
-            "trial_resources": {"cpu": 1, "gpu": 0},
+                "trial_resources": {
+                    "cpu": 1,
+                    "gpu": 0
+                },
                 "config": {
                     "factor_1": 4.0,
                     "factor_2": 1.0,
                 },
             }
-    }, scheduler=pbt, verbose=False)
+        },
+        scheduler=pbt,
+        verbose=False)

python/ray/tune/examples/pbt_ppo_example.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-
 """Example of using PBT with RLlib.
 
 Note that this requires a cluster with at least 8 GPUs in order for all trials
@@ -30,7 +29,8 @@ if __name__ == "__main__":
         return config
 
     pbt = PopulationBasedTraining(
-        time_attr="time_total_s", reward_attr="episode_reward_mean",
+        time_attr="time_total_s",
+        reward_attr="episode_reward_mean",
         perturbation_interval=120,
         resample_probability=0.25,
         # Specifies the mutations of these hyperparams
@@ -45,26 +45,40 @@ if __name__ == "__main__":
         custom_explore_fn=explore)
 
     ray.init()
-    run_experiments({
+    run_experiments(
+        {
             "pbt_humanoid_test": {
                 "run": "PPO",
                 "env": "Humanoid-v1",
                 "repeat": 8,
-            "trial_resources": {"cpu": 4, "gpu": 1},
+                "trial_resources": {
+                    "cpu": 4,
+                    "gpu": 1
+                },
                 "config": {
-                "kl_coeff": 1.0,
-                "num_workers": 8,
+                    "kl_coeff":
+                    1.0,
+                    "num_workers":
+                    8,
                     "devices": ["/gpu:0"],
-                "model": {"free_log_std": True},
+                    "model": {
+                        "free_log_std": True
+                    },
                     # These params are tuned from a fixed starting value.
-                "lambda": 0.95,
-                "clip_param": 0.2,
-                "sgd_stepsize": 1e-4,
+                    "lambda":
+                    0.95,
+                    "clip_param":
+                    0.2,
+                    "sgd_stepsize":
+                    1e-4,
                     # These params start off randomly drawn from a set.
-                "num_sgd_iter": lambda spec: random.choice([10, 20, 30]),
-                "sgd_batchsize": lambda spec: random.choice([128, 512, 2048]),
+                    "num_sgd_iter":
+                    lambda spec: random.choice([10, 20, 30]),
+                    "sgd_batchsize":
+                    lambda spec: random.choice([128, 512, 2048]),
                     "timesteps_per_batch":
                     lambda spec: random.choice([10000, 20000, 40000])
                 },
             },
-    }, scheduler=pbt)
+        },
+        scheduler=pbt)

python/ray/tune/examples/pbt_tune_cifar10_with_keras.py

@@ -29,12 +29,10 @@ from ray.tune import Trainable
 from ray.tune import TrainingResult
 from ray.tune.pbt import PopulationBasedTraining
 
-
 num_classes = 10
 
 
 class Cifar10Model(Trainable):
-
     def _read_data(self):
         # The data, split between train and test sets:
         (x_train, y_train), (x_test, y_test) = cifar10.load_data()
@@ -54,27 +52,51 @@ class Cifar10Model(Trainable):
         x = Input(shape=(32, 32, 3))
         y = x
         y = Convolution2D(
-            filters=64, kernel_size=3, strides=1, padding="same",
-            activation="relu", kernel_initializer="he_normal")(y)
+            filters=64,
+            kernel_size=3,
+            strides=1,
+            padding="same",
+            activation="relu",
+            kernel_initializer="he_normal")(y)
         y = Convolution2D(
-            filters=64, kernel_size=3, strides=1, padding="same",
-            activation="relu", kernel_initializer="he_normal")(y)
+            filters=64,
+            kernel_size=3,
+            strides=1,
+            padding="same",
+            activation="relu",
+            kernel_initializer="he_normal")(y)
         y = MaxPooling2D(pool_size=2, strides=2, padding="same")(y)
 
         y = Convolution2D(
-            filters=128, kernel_size=3, strides=1, padding="same",
-            activation="relu", kernel_initializer="he_normal")(y)
+            filters=128,
+            kernel_size=3,
+            strides=1,
+            padding="same",
+            activation="relu",
+            kernel_initializer="he_normal")(y)
         y = Convolution2D(
-            filters=128, kernel_size=3, strides=1, padding="same",
-            activation="relu", kernel_initializer="he_normal")(y)
+            filters=128,
+            kernel_size=3,
+            strides=1,
+            padding="same",
+            activation="relu",
+            kernel_initializer="he_normal")(y)
         y = MaxPooling2D(pool_size=2, strides=2, padding="same")(y)
 
         y = Convolution2D(
-            filters=256, kernel_size=3, strides=1, padding="same",
-            activation="relu", kernel_initializer="he_normal")(y)
+            filters=256,
+            kernel_size=3,
+            strides=1,
+            padding="same",
+            activation="relu",
+            kernel_initializer="he_normal")(y)
         y = Convolution2D(
-            filters=256, kernel_size=3, strides=1, padding="same",
-            activation="relu", kernel_initializer="he_normal")(y)
+            filters=256,
+            kernel_size=3,
+            strides=1,
+            padding="same",
+            activation="relu",
+            kernel_initializer="he_normal")(y)
         y = MaxPooling2D(pool_size=2, strides=2, padding="same")(y)
 
         y = Flatten()(y)
@@ -91,7 +113,8 @@ class Cifar10Model(Trainable):
         model = self._build_model(x_train.shape[1:])
 
         opt = tf.keras.optimizers.Adadelta()
-        model.compile(loss="categorical_crossentropy",
+        model.compile(
+            loss="categorical_crossentropy",
             optimizer=opt,
             metrics=["accuracy"])
         self.model = model
@@ -134,8 +157,7 @@ class Cifar10Model(Trainable):
 
         # loss, accuracy
         _, accuracy = self.model.evaluate(x_test, y_test, verbose=0)
-        return TrainingResult(timesteps_this_iter=10,
-                              mean_accuracy=accuracy)
+        return TrainingResult(timesteps_this_iter=10, mean_accuracy=accuracy)
 
     def _save(self, checkpoint_dir):
         file_path = checkpoint_dir + "/model"
@@ -154,15 +176,17 @@ class Cifar10Model(Trainable):
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()
-    parser.add_argument("--smoke-test",
-                        action="store_true",
-                        help="Finish quickly for testing")
+    parser.add_argument(
+        "--smoke-test", action="store_true", help="Finish quickly for testing")
     args, _ = parser.parse_known_args()
 
     register_trainable("train_cifar10", Cifar10Model)
     train_spec = {
         "run": "train_cifar10",
-        "trial_resources": {"cpu": 1, "gpu": 1},
+        "trial_resources": {
+            "cpu": 1,
+            "gpu": 1
+        },
         "stop": {
             "mean_accuracy": 0.80,
             "timesteps_total": 300,
@@ -170,7 +194,7 @@ if __name__ == "__main__":
         "config": {
             "epochs": 1,
             "batch_size": 64,
-            "lr": grid_search([10 ** -4, 10 ** -5]),
+            "lr": grid_search([10**-4, 10**-5]),
             "decay": lambda spec: spec.config.lr / 100.0,
             "dropout": grid_search([0.25, 0.5]),
         },
@@ -178,17 +202,17 @@ if __name__ == "__main__":
     }
 
     if args.smoke_test:
-        train_spec["config"]["lr"] = 10 ** -4
+        train_spec["config"]["lr"] = 10**-4
         train_spec["config"]["dropout"] = 0.5
 
     ray.init()
 
     pbt = PopulationBasedTraining(
-        time_attr="timesteps_total", reward_attr="mean_accuracy",
+        time_attr="timesteps_total",
+        reward_attr="mean_accuracy",
         perturbation_interval=10,
         hyperparam_mutations={
             "dropout": lambda _: np.random.uniform(0, 1),
         })
 
-    run_experiments({"pbt_cifar10": train_spec},
-                    scheduler=pbt)
+    run_experiments({"pbt_cifar10": train_spec}, scheduler=pbt)

python/ray/tune/examples/tune_mnist_async_hyperband.py

@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ==============================================================================
-
 """A deep MNIST classifier using convolutional layers.
 
 See extensive documentation at
@@ -90,7 +89,7 @@ def deepnn(x):
         W_fc1 = weight_variable([7 * 7 * 64, 1024])
         b_fc1 = bias_variable([1024])
 
-        h_pool2_flat = tf.reshape(h_pool2, [-1, 7*7*64])
+        h_pool2_flat = tf.reshape(h_pool2, [-1, 7 * 7 * 64])
         h_fc1 = activation_fn(tf.matmul(h_pool2_flat, W_fc1) + b_fc1)
 
     # Dropout - controls the complexity of the model, prevents co-adaptation of
@@ -173,7 +172,10 @@ def main(_):
             batch = mnist.train.next_batch(50)
             if i % 10 == 0:
                 train_accuracy = accuracy.eval(feed_dict={
-                        x: batch[0], y_: batch[1], keep_prob: 1.0})
+                    x: batch[0],
+                    y_: batch[1],
+                    keep_prob: 1.0
+                })
 
                 # !!! Report status to ray.tune !!!
                 if status_reporter:
@@ -181,11 +183,17 @@ def main(_):
                         timesteps_total=i, mean_accuracy=train_accuracy)
 
                 print('step %d, training accuracy %g' % (i, train_accuracy))
-            train_step.run(
-                feed_dict={x: batch[0], y_: batch[1], keep_prob: 0.5})
+            train_step.run(feed_dict={
+                x: batch[0],
+                y_: batch[1],
+                keep_prob: 0.5
+            })
 
         print('test accuracy %g' % accuracy.eval(feed_dict={
-                x: mnist.test.images, y_: mnist.test.labels, keep_prob: 1.0}))
+            x: mnist.test.images,
+            y_: mnist.test.labels,
+            keep_prob: 1.0
+        }))
 
 
 # !!! Entrypoint for ray.tune !!!
@@ -195,7 +203,9 @@ def train(config={'activation': 'relu'}, reporter=None):
     activation_fn = getattr(tf.nn, config['activation'])
     parser = argparse.ArgumentParser()
     parser.add_argument(
-        '--data_dir', type=str, default='/tmp/tensorflow/mnist/input_data',
+        '--data_dir',
+        type=str,
+        default='/tmp/tensorflow/mnist/input_data',
         help='Directory for storing input data')
     FLAGS, unparsed = parser.parse_known_args()
     tf.app.run(main=main, argv=[sys.argv[0]] + unparsed)
@@ -228,8 +238,12 @@ if __name__ == '__main__':
     ray.init()
 
     from ray.tune.async_hyperband import AsyncHyperBandScheduler
-    run_experiments({'tune_mnist_test': mnist_spec},
+    run_experiments(
+        {
+            'tune_mnist_test': mnist_spec
+        },
         scheduler=AsyncHyperBandScheduler(
             time_attr="timesteps_total",
             reward_attr="mean_accuracy",
-                        max_t=600,))
+            max_t=600,
+        ))

python/ray/tune/examples/tune_mnist_ray.py

@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ==============================================================================
-
 """A deep MNIST classifier using convolutional layers.
 
 See extensive documentation at
@@ -90,7 +89,7 @@ def deepnn(x):
         W_fc1 = weight_variable([7 * 7 * 64, 1024])
         b_fc1 = bias_variable([1024])
 
-        h_pool2_flat = tf.reshape(h_pool2, [-1, 7*7*64])
+        h_pool2_flat = tf.reshape(h_pool2, [-1, 7 * 7 * 64])
         h_fc1 = activation_fn(tf.matmul(h_pool2_flat, W_fc1) + b_fc1)
 
     # Dropout - controls the complexity of the model, prevents co-adaptation of
@@ -173,7 +172,10 @@ def main(_):
             batch = mnist.train.next_batch(50)
             if i % 10 == 0:
                 train_accuracy = accuracy.eval(feed_dict={
-                        x: batch[0], y_: batch[1], keep_prob: 1.0})
+                    x: batch[0],
+                    y_: batch[1],
+                    keep_prob: 1.0
+                })
 
                 # !!! Report status to ray.tune !!!
                 if status_reporter:
@@ -181,11 +183,17 @@ def main(_):
                         timesteps_total=i, mean_accuracy=train_accuracy)
 
                 print('step %d, training accuracy %g' % (i, train_accuracy))
-            train_step.run(
-                feed_dict={x: batch[0], y_: batch[1], keep_prob: 0.5})
+            train_step.run(feed_dict={
+                x: batch[0],
+                y_: batch[1],
+                keep_prob: 0.5
+            })
 
         print('test accuracy %g' % accuracy.eval(feed_dict={
-                x: mnist.test.images, y_: mnist.test.labels, keep_prob: 1.0}))
+            x: mnist.test.images,
+            y_: mnist.test.labels,
+            keep_prob: 1.0
+        }))
 
 
 # !!! Entrypoint for ray.tune !!!
@@ -195,7 +203,9 @@ def train(config={'activation': 'relu'}, reporter=None):
     activation_fn = getattr(tf.nn, config['activation'])
     parser = argparse.ArgumentParser()
     parser.add_argument(
-        '--data_dir', type=str, default='/tmp/tensorflow/mnist/input_data',
+        '--data_dir',
+        type=str,
+        default='/tmp/tensorflow/mnist/input_data',
         help='Directory for storing input data')
     FLAGS, unparsed = parser.parse_known_args()
     tf.app.run(main=main, argv=[sys.argv[0]] + unparsed)

python/ray/tune/examples/tune_mnist_ray_hyperband.py

@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ==============================================================================
-
 """A deep MNIST classifier using convolutional layers.
 See extensive documentation at
 https://www.tensorflow.org/get_started/mnist/pros
@@ -85,7 +84,7 @@ def setupCNN(x):
         W_fc1 = weight_variable([7 * 7 * 64, 1024])
         b_fc1 = bias_variable([1024])
 
-        h_pool2_flat = tf.reshape(h_pool2, [-1, 7*7*64])
+        h_pool2_flat = tf.reshape(h_pool2, [-1, 7 * 7 * 64])
         h_fc1 = activation_fn(tf.matmul(h_pool2_flat, W_fc1) + b_fc1)
 
     # Dropout - controls the complexity of the model, prevents co-adaptation of
@@ -182,14 +181,18 @@ class TrainMNIST(Trainable):
             self.sess.run(
                 self.train_step,
                 feed_dict={
-                    self.x: batch[0], self.y_: batch[1], self.keep_prob: 0.5
+                    self.x: batch[0],
+                    self.y_: batch[1],
+                    self.keep_prob: 0.5
                 })
 
         batch = self.mnist.train.next_batch(50)
         train_accuracy = self.sess.run(
             self.accuracy,
             feed_dict={
-                self.x: batch[0], self.y_: batch[1], self.keep_prob: 1.0
+                self.x: batch[0],
+                self.y_: batch[1],
+                self.keep_prob: 1.0
             })
 
         self.iterations += 1
@@ -219,7 +222,7 @@ if __name__ == '__main__':
             'time_total_s': 600,
         },
         'config': {
-            'learning_rate': lambda spec:  10 ** np.random.uniform(-5, -3),
+            'learning_rate': lambda spec: 10**np.random.uniform(-5, -3),
             'activation': grid_search(['relu', 'elu', 'tanh']),
         },
         "repeat": 10,
@@ -231,8 +234,6 @@ if __name__ == '__main__':
 
     ray.init()
     hyperband = HyperBandScheduler(
-        time_attr="timesteps_total", reward_attr="mean_accuracy",
-        max_t=100)
+        time_attr="timesteps_total", reward_attr="mean_accuracy", max_t=100)
 
-    run_experiments(
-        {'mnist_hyperband_test': mnist_spec}, scheduler=hyperband)
+    run_experiments({'mnist_hyperband_test': mnist_spec}, scheduler=hyperband)

python/ray/tune/experiment.py

@@ -35,14 +35,26 @@ class Experiment(object):
             checkpoint at least this many times. Only applies if
             checkpointing is enabled. Defaults to 3.
     """
-    def __init__(self, name, run, stop=None, config=None,
-                 trial_resources=None, repeat=1, local_dir=None,
-                 upload_dir="", checkpoint_freq=0, max_failures=3):
+
+    def __init__(self,
+                 name,
+                 run,
+                 stop=None,
+                 config=None,
+                 trial_resources=None,
+                 repeat=1,
+                 local_dir=None,
+                 upload_dir="",
+                 checkpoint_freq=0,
+                 max_failures=3):
         spec = {
             "run": run,
             "stop": stop or {},
             "config": config or {},
-            "trial_resources": trial_resources or {"cpu": 1, "gpu": 0},
+            "trial_resources": trial_resources or {
+                "cpu": 1,
+                "gpu": 0
+            },
             "repeat": repeat,
             "local_dir": local_dir or DEFAULT_RESULTS_DIR,
             "upload_dir": upload_dir,

python/ray/tune/function_runner.py

@@ -91,8 +91,8 @@ class FunctionRunner(Trainable):
         for k in self._default_config:
             if k in scrubbed_config:
                 del scrubbed_config[k]
-        self._runner = _RunnerThread(
-            entrypoint, scrubbed_config, self._status_reporter)
+        self._runner = _RunnerThread(entrypoint, scrubbed_config,
+                                     self._status_reporter)
         self._start_time = time.time()
         self._last_reported_timestep = 0
         self._runner.start()
@@ -104,8 +104,7 @@ class FunctionRunner(Trainable):
 
     def _train(self):
         time.sleep(
-            self.config.get(
-                "script_min_iter_time_s",
+            self.config.get("script_min_iter_time_s",
                             self._default_config["script_min_iter_time_s"]))
         result = self._status_reporter._get_and_clear_status()
         while result is None:

python/ray/tune/hpo_scheduler.py

@@ -102,9 +102,8 @@ class HyperOptScheduler(FIFOScheduler):
             self._hpopt_trials.refresh()
 
             # Get new suggestion from
-            new_trials = self.algo(
-                new_ids, self.domain, self._hpopt_trials,
-                self.rstate.randint(2 ** 31 - 1))
+            new_trials = self.algo(new_ids, self.domain, self._hpopt_trials,
+                                   self.rstate.randint(2**31 - 1))
             self._hpopt_trials.insert_trial_docs(new_trials)
             self._hpopt_trials.refresh()
             new_trial = new_trials[0]
@@ -112,8 +111,11 @@ class HyperOptScheduler(FIFOScheduler):
             suggested_config = hpo.base.spec_from_misc(new_trial["misc"])
             new_cfg.update(suggested_config)
 
-            kv_str = "_".join(["{}={}".format(k, str(v)[:5])
-                               for k, v in sorted(suggested_config.items())])
+            kv_str = "_".join([
+                "{}={}".format(k,
+                               str(v)[:5])
+                for k, v in sorted(suggested_config.items())
+            ])
             experiment_tag = "{}_{}".format(new_trial_id, kv_str)
 
             # Keep this consistent with tune.variant_generator
@@ -166,8 +168,7 @@ class HyperOptScheduler(FIFOScheduler):
         del self._tune_to_hp[trial]
 
     def _to_hyperopt_result(self, result):
-        return {"loss": -getattr(result, self._reward_attr),
-                "status": "ok"}
+        return {"loss": -getattr(result, self._reward_attr), "status": "ok"}
 
     def _get_hyperopt_trial(self, tid):
         return [t for t in self._hpopt_trials.trials if t["tid"] == tid][0]
@@ -183,8 +184,9 @@ class HyperOptScheduler(FIFOScheduler):
         experiments and trials left to run. If self._max_concurrent is None,
         scheduler will add new trial if there is none that are pending.
         """
-        pending = [t for t in trial_runner.get_trials()
-                   if t.status == Trial.PENDING]
+        pending = [
+            t for t in trial_runner.get_trials() if t.status == Trial.PENDING
+        ]
         if self._num_trials_left <= 0:
             return
         if self._max_concurrent is None:

python/ray/tune/hyperband.py

@@ -66,9 +66,10 @@ class HyperBandScheduler(FIFOScheduler):
             mentioned in the original HyperBand paper.
     """
 
-    def __init__(
-            self, time_attr='training_iteration',
-            reward_attr='episode_reward_mean', max_t=81):
+    def __init__(self,
+                 time_attr='training_iteration',
+                 reward_attr='episode_reward_mean',
+                 max_t=81):
         assert max_t > 0, "Max (time_attr) not valid!"
         FIFOScheduler.__init__(self)
         self._eta = 3
@@ -78,13 +79,12 @@ class HyperBandScheduler(FIFOScheduler):
         self._get_n0 = lambda s: int(
             np.ceil(self._s_max_1/(s+1) * self._eta**s))
         # bracket initial iterations
-        self._get_r0 = lambda s: int((max_t*self._eta**(-s)))
+        self._get_r0 = lambda s: int((max_t * self._eta**(-s)))
         self._hyperbands = [[]]  # list of hyperband iterations
         self._trial_info = {}  # Stores Trial -> Bracket, Band Iteration
 
         # Tracks state for new trial add
-        self._state = {"bracket": None,
-                       "band_idx": 0}
+        self._state = {"bracket": None, "band_idx": 0}
         self._num_stopped = 0
         self._reward_attr = reward_attr
         self._time_attr = time_attr
@@ -116,9 +116,9 @@ class HyperBandScheduler(FIFOScheduler):
                     cur_bracket = None
                 else:
                     retry = False
-                    cur_bracket = Bracket(
-                        self._time_attr, self._get_n0(s), self._get_r0(s),
-                        self._max_t_attr, self._eta, s)
+                    cur_bracket = Bracket(self._time_attr, self._get_n0(s),
+                                          self._get_r0(s), self._max_t_attr,
+                                          self._eta, s)
                 cur_band.append(cur_bracket)
                 self._state["bracket"] = cur_bracket
 
@@ -217,11 +217,11 @@ class HyperBandScheduler(FIFOScheduler):
         """
 
         for hyperband in self._hyperbands:
-            for bracket in sorted(hyperband,
-                                  key=lambda b: b.completion_percentage()):
+            for bracket in sorted(
+                    hyperband, key=lambda b: b.completion_percentage()):
                 for trial in bracket.current_trials():
-                    if (trial.status == Trial.PENDING and
-                            trial_runner.has_resources(trial.resources)):
+                    if (trial.status == Trial.PENDING
+                            and trial_runner.has_resources(trial.resources)):
                         return trial
         return None
 
@@ -258,6 +258,7 @@ class Bracket():
 
     Also keeps track of progress to ensure good scheduling.
     """
+
     def __init__(self, time_attr, max_trials, init_t_attr, max_t_attr, eta, s):
         self._live_trials = {}  # maps trial -> current result
         self._all_trials = []
@@ -287,7 +288,8 @@ class Bracket():
         """Checks if all iterations have completed.
 
         TODO(rliaw): also check that `t.iterations == self._r`"""
-        return all(self._get_result_time(result) >= self._cumul_r
+        return all(
+            self._get_result_time(result) >= self._cumul_r
             for result in self._live_trials.values())
 
     def finished(self):
@@ -379,7 +381,7 @@ class Bracket():
     def _calculate_total_work(self, n, r, s):
         work = 0
         cumulative_r = r
-        for i in range(s+1):
+        for i in range(s + 1):
             work += int(n) * int(r)
             n /= self._eta
             n = int(np.ceil(n))
@@ -389,11 +391,11 @@ class Bracket():
 
     def __repr__(self):
         status = ", ".join([
-            "Max Size (n)={}".format(self._n),
-            "Milestone (r)={}".format(self._cumul_r),
-            "completed={:.1%}".format(self.completion_percentage())
+            "Max Size (n)={}".format(self._n), "Milestone (r)={}".format(
+                self._cumul_r), "completed={:.1%}".format(
+                    self.completion_percentage())
         ])
         counts = collections.Counter([t.status for t in self._all_trials])
-        trial_statuses = ", ".join(sorted(
-            ["{}: {}".format(k, v) for k, v in counts.items()]))
+        trial_statuses = ", ".join(
+            sorted(["{}: {}".format(k, v) for k, v in counts.items()]))
         return "Bracket({}): {{{}}} ".format(status, trial_statuses)

python/ray/tune/log_sync.py

@@ -13,7 +13,6 @@ from ray.tune.cluster_info import get_ssh_key, get_ssh_user
 from ray.tune.error import TuneError
 from ray.tune.result import DEFAULT_RESULTS_DIR
 
-
 # Map from (logdir, remote_dir) -> syncer
 _syncers = {}
 
@@ -69,8 +68,7 @@ class _LogSyncer(object):
     def sync_now(self, force=False):
         self.last_sync_time = time.time()
         if not self.worker_ip:
-            print(
-                "Worker ip unknown, skipping log sync for {}".format(
+            print("Worker ip unknown, skipping log sync for {}".format(
                 self.local_dir))
             return
 
@@ -80,22 +78,20 @@ class _LogSyncer(object):
             ssh_key = get_ssh_key()
             ssh_user = get_ssh_user()
             if ssh_key is None or ssh_user is None:
-                print(
-                    "Error: log sync requires cluster to be setup with "
+                print("Error: log sync requires cluster to be setup with "
                       "`ray create_or_update`.")
                 return
             if not distutils.spawn.find_executable("rsync"):
                 print("Error: log sync requires rsync to be installed.")
                 return
-            worker_to_local_sync_cmd = (
-                ("""rsync -avz -e "ssh -i '{}' -o ConnectTimeout=120s """
+            worker_to_local_sync_cmd = ((
+                """rsync -avz -e "ssh -i '{}' -o ConnectTimeout=120s """
                 """-o StrictHostKeyChecking=no" '{}@{}:{}/' '{}/'""").format(
                     ssh_key, ssh_user, self.worker_ip,
                     pipes.quote(self.local_dir), pipes.quote(self.local_dir)))
 
         if self.remote_dir:
-            local_to_remote_sync_cmd = (
-                "aws s3 sync '{}' '{}'".format(
+            local_to_remote_sync_cmd = ("aws s3 sync '{}' '{}'".format(
                 pipes.quote(self.local_dir), pipes.quote(self.remote_dir)))
         else:
             local_to_remote_sync_cmd = None

python/ray/tune/logger.py

@@ -110,9 +110,9 @@ def to_tf_values(result, path):
     for attr, value in result.items():
         if value is not None:
             if type(value) in [int, float]:
-                values.append(tf.Summary.Value(
-                    tag="/".join(path + [attr]),
-                    simple_value=value))
+                values.append(
+                    tf.Summary.Value(
+                        tag="/".join(path + [attr]), simple_value=value))
             elif type(value) is dict:
                 values.extend(to_tf_values(value, path + [attr]))
     return values
@@ -125,8 +125,8 @@ class _TFLogger(Logger):
     def on_result(self, result):
         tmp = result._asdict()
         for k in [
-                "config", "pid", "timestamp", "time_total_s",
-                "timesteps_total"]:
+                "config", "pid", "timestamp", "time_total_s", "timesteps_total"
+        ]:
             del tmp[k]  # not useful to tf log these
         values = to_tf_values(tmp, ["ray", "tune"])
         train_stats = tf.Summary(value=values)

python/ray/tune/median_stopping_rule.py

@@ -32,10 +32,13 @@ class MedianStoppingRule(FIFOScheduler):
             time a trial reports. Defaults to True.
     """
 
-    def __init__(
-            self, time_attr="time_total_s", reward_attr="episode_reward_mean",
-            grace_period=60.0, min_samples_required=3,
-            hard_stop=True, verbose=True):
+    def __init__(self,
+                 time_attr="time_total_s",
+                 reward_attr="episode_reward_mean",
+                 grace_period=60.0,
+                 min_samples_required=3,
+                 hard_stop=True,
+                 verbose=True):
         FIFOScheduler.__init__(self)
         self._stopped_trials = set()
         self._completed_trials = set()
@@ -103,9 +106,10 @@ class MedianStoppingRule(FIFOScheduler):
         results = self._results[trial]
         # TODO(ekl) we could do interpolation to be more precise, but for now
         # assume len(results) is large and the time diffs are roughly equal
-        return np.mean(
-            [getattr(r, self._reward_attr)
-                for r in results if getattr(r, self._time_attr) <= t_max])
+        return np.mean([
+            getattr(r, self._reward_attr) for r in results
+            if getattr(r, self._time_attr) <= t_max
+        ])
 
     def _best_result(self, trial):
         results = self._results[trial]

python/ray/tune/pbt.py

@@ -11,7 +11,6 @@ from ray.tune.trial import Trial
 from ray.tune.trial_scheduler import FIFOScheduler, TrialScheduler
 from ray.tune.variant_generator import _format_vars
 
-
 # Parameters are transferred from the top PBT_QUANTILE fraction of trials to
 # the bottom PBT_QUANTILE fraction.
 PBT_QUANTILE = 0.25
@@ -27,8 +26,7 @@ class PBTTrialState(object):
         self.last_perturbation_time = 0
 
     def __repr__(self):
-        return str((
-            self.last_score, self.last_checkpoint,
+        return str((self.last_score, self.last_checkpoint,
                     self.last_perturbation_time))
 
 
@@ -51,11 +49,12 @@ def explore(config, mutations, resample_probability, custom_explore_fn):
                     config[key] not in distribution:
                 new_config[key] = random.choice(distribution)
             elif random.random() > 0.5:
-                new_config[key] = distribution[
-                    max(0, distribution.index(config[key]) - 1)]
+                new_config[key] = distribution[max(
+                    0,
+                    distribution.index(config[key]) - 1)]
             else:
-                new_config[key] = distribution[
-                    min(len(distribution) - 1,
+                new_config[key] = distribution[min(
+                    len(distribution) - 1,
                     distribution.index(config[key]) + 1)]
         else:
             if random.random() < resample_probability:
@@ -70,8 +69,8 @@ def explore(config, mutations, resample_probability, custom_explore_fn):
         new_config = custom_explore_fn(new_config)
         assert new_config is not None, \
             "Custom explore fn failed to return new config"
-    print(
-        "[explore] perturbed config from {} -> {}".format(config, new_config))
+    print("[explore] perturbed config from {} -> {}".format(
+        config, new_config))
     return new_config
 
 
@@ -148,10 +147,13 @@ class PopulationBasedTraining(FIFOScheduler):
         >>> run_experiments({...}, scheduler=pbt)
     """
 
-    def __init__(
-            self, time_attr="time_total_s", reward_attr="episode_reward_mean",
-            perturbation_interval=60.0, hyperparam_mutations={},
-            resample_probability=0.25, custom_explore_fn=None):
+    def __init__(self,
+                 time_attr="time_total_s",
+                 reward_attr="episode_reward_mean",
+                 perturbation_interval=60.0,
+                 hyperparam_mutations={},
+                 resample_probability=0.25,
+                 custom_explore_fn=None):
         if not hyperparam_mutations and not custom_explore_fn:
             raise TuneError(
                 "You must specify at least one of `hyperparam_mutations` or "
@@ -209,11 +211,10 @@ class PopulationBasedTraining(FIFOScheduler):
         if not new_state.last_checkpoint:
             print("[pbt] warn: no checkpoint for trial, skip exploit", trial)
             return
-        new_config = explore(
-            trial_to_clone.config, self._hyperparam_mutations,
-            self._resample_probability, self._custom_explore_fn)
-        print(
-            "[exploit] transferring weights from trial "
+        new_config = explore(trial_to_clone.config, self._hyperparam_mutations,
+                             self._resample_probability,
+                             self._custom_explore_fn)
+        print("[exploit] transferring weights from trial "
               "{} (score {}) -> {} (score {})".format(
                   trial_to_clone, new_state.last_score, trial,
                   trial_state.last_score))
@@ -242,9 +243,8 @@ class PopulationBasedTraining(FIFOScheduler):
         if len(trials) <= 1:
             return [], []
         else:
-            return (
-                trials[:int(math.ceil(len(trials)*PBT_QUANTILE))],
-                trials[int(math.floor(-len(trials)*PBT_QUANTILE)):])
+            return (trials[:int(math.ceil(len(trials) * PBT_QUANTILE))],
+                    trials[int(math.floor(-len(trials) * PBT_QUANTILE)):])
 
     def choose_trial_to_run(self, trial_runner):
         """Ensures all trials get fair share of time (as defined by time_attr).

python/ray/tune/registry.py

@@ -14,7 +14,8 @@ ENV_CREATOR = "env_creator"
 RLLIB_MODEL = "rllib_model"
 RLLIB_PREPROCESSOR = "rllib_preprocessor"
 KNOWN_CATEGORIES = [
-    TRAINABLE_CLASS, ENV_CREATOR, RLLIB_MODEL, RLLIB_PREPROCESSOR]
+    TRAINABLE_CLASS, ENV_CREATOR, RLLIB_MODEL, RLLIB_PREPROCESSOR
+]
 
 
 def register_trainable(name, trainable):
@@ -32,8 +33,8 @@ def register_trainable(name, trainable):
     if isinstance(trainable, FunctionType):
         trainable = wrap_function(trainable)
     if not issubclass(trainable, Trainable):
-        raise TypeError(
-            "Second argument must be convertable to Trainable", trainable)
+        raise TypeError("Second argument must be convertable to Trainable",
+                        trainable)
     _default_registry.register(TRAINABLE_CLASS, name, trainable)
 
 
@@ -46,8 +47,7 @@ def register_env(name, env_creator):
     """
 
     if not isinstance(env_creator, FunctionType):
-        raise TypeError(
-            "Second argument must be a function.", env_creator)
+        raise TypeError("Second argument must be a function.", env_creator)
     _default_registry.register(ENV_CREATOR, name, env_creator)
 
 

python/ray/tune/result.py

@@ -4,8 +4,6 @@ from __future__ import print_function
 
 from collections import namedtuple
 import os
-
-
 """
 When using ray.tune with custom training scripts, you must periodically report
 training status back to Ray by calling reporter(result).
@@ -18,8 +16,9 @@ In RLlib, the supplied algorithms fill in TrainingResult for you.
 # Where ray.tune writes result files by default
 DEFAULT_RESULTS_DIR = os.path.expanduser("~/ray_results")
 
-
-TrainingResult = namedtuple("TrainingResult", [
+TrainingResult = namedtuple(
+    "TrainingResult",
+    [
         # (Required) Accumulated timesteps for this entire experiment.
         "timesteps_total",
 
@@ -50,18 +49,21 @@ TrainingResult = namedtuple("TrainingResult", [
         # (Auto-filled) The negated current training loss.
         "neg_mean_loss",
 
-    # (Auto-filled) Unique string identifier for this experiment. This id is
-    # preserved across checkpoint / restore calls.
+        # (Auto-filled) Unique string identifier for this experiment.
+        # This id is preserved across checkpoint / restore calls.
         "experiment_id",
 
-    # (Auto-filled) The index of this training iteration, e.g. call to train().
+        # (Auto-filled) The index of this training iteration,
+        # e.g. call to train().
         "training_iteration",
 
-    # (Auto-filled) Number of timesteps in the simulator in this iteration.
+        # (Auto-filled) Number of timesteps in the simulator
+        # in this iteration.
         "timesteps_this_iter",
 
-    # (Auto-filled) Time in seconds this iteration took to run. This may be
-    # overriden in order to override the system-computed time difference.
+        # (Auto-filled) Time in seconds this iteration took to run. This may
+        # be overriden in order to override the system-computed
+        # time difference.
         "time_this_iter_s",
 
         # (Auto-filled) Accumulated time in seconds for this entire experiment.
@@ -76,15 +78,16 @@ TrainingResult = namedtuple("TrainingResult", [
         # (Auto-filled) A UNIX timestamp of when the result was processed.
         "timestamp",
 
-    # (Auto-filled) The hostname of the machine hosting the training process.
+        # (Auto-filled) The hostname of the machine hosting the
+        # training process.
         "hostname",
 
-    # (Auto-filled) The node ip of the machine hosting the training process.
+        # (Auto-filled) The node ip of the machine hosting the
+        # training process.
         "node_ip",
 
         # (Auto=filled) The current hyperparameter configuration.
         "config",
-])
+    ])
 
-
-TrainingResult.__new__.__defaults__ = (None,) * len(TrainingResult._fields)
+TrainingResult.__new__.__defaults__ = (None, ) * len(TrainingResult._fields)

python/ray/tune/test/dependency_test.py

@@ -20,7 +20,9 @@ if __name__ == "__main__":
     run_experiments({
         "test": {
             "run": "my_class",
-            "stop": {"training_iteration": 1}
+            "stop": {
+                "training_iteration": 1
+            }
         }
     })
     assert 'ray.rllib' not in sys.modules, "RLlib should not be imported"

python/ray/tune/test/trial_runner_test.py

@@ -60,163 +60,209 @@ class TrainableFunctionApiTest(unittest.TestCase):
     def testRewriteEnv(self):
         def train(config, reporter):
             reporter(timesteps_total=1)
+
         register_trainable("f1", train)
 
-        [trial] = run_experiments({"foo": {
+        [trial] = run_experiments({
+            "foo": {
                 "run": "f1",
                 "env": "CartPole-v0",
-        }})
+            }
+        })
         self.assertEqual(trial.config["env"], "CartPole-v0")
 
     def testConfigPurity(self):
         def train(config, reporter):
             assert config == {"a": "b"}, config
             reporter(timesteps_total=1)
+
         register_trainable("f1", train)
-        run_experiments({"foo": {
+        run_experiments({
+            "foo": {
                 "run": "f1",
-            "config": {"a": "b"},
-        }})
+                "config": {
+                    "a": "b"
+                },
+            }
+        })
 
     def testLogdir(self):
         def train(config, reporter):
             assert "/tmp/logdir/foo" in os.getcwd(), os.getcwd()
             reporter(timesteps_total=1)
+
         register_trainable("f1", train)
-        run_experiments({"foo": {
+        run_experiments({
+            "foo": {
                 "run": "f1",
                 "local_dir": "/tmp/logdir",
-            "config": {"a": "b"},
-        }})
+                "config": {
+                    "a": "b"
+                },
+            }
+        })
 
     def testLongFilename(self):
         def train(config, reporter):
             assert "/tmp/logdir/foo" in os.getcwd(), os.getcwd()
             reporter(timesteps_total=1)
+
         register_trainable("f1", train)
-        run_experiments({"foo": {
+        run_experiments({
+            "foo": {
                 "run": "f1",
                 "local_dir": "/tmp/logdir",
                 "config": {
                     "a" * 50: lambda spec: 5.0 / 7,
-                "b" * 50: lambda spec: "long" * 40},
-        }})
+                    "b" * 50: lambda spec: "long" * 40
+                },
+            }
+        })
 
     def testBadParams(self):
         def f():
             run_experiments({"foo": {}})
+
         self.assertRaises(TuneError, f)
 
     def testBadParams2(self):
         def f():
-            run_experiments({"foo": {
+            run_experiments({
+                "foo": {
                     "run": "asdf",
                     "bah": "this param is not allowed",
-            }})
+                }
+            })
+
         self.assertRaises(TuneError, f)
 
     def testBadParams3(self):
         def f():
-            run_experiments({"foo": {
+            run_experiments({
+                "foo": {
                     "run": grid_search("invalid grid search"),
-            }})
+                }
+            })
+
         self.assertRaises(TuneError, f)
 
     def testBadParams4(self):
         def f():
-            run_experiments({"foo": {
+            run_experiments({
+                "foo": {
                     "run": "asdf",
-            }})
+                }
+            })
+
         self.assertRaises(TuneError, f)
 
     def testBadParams5(self):
         def f():
-            run_experiments({"foo": {
-                "run": "PPO",
-                "stop": {"asdf": 1}
-            }})
+            run_experiments({"foo": {"run": "PPO", "stop": {"asdf": 1}}})
+
         self.assertRaises(TuneError, f)
 
     def testBadParams6(self):
         def f():
-            run_experiments({"foo": {
+            run_experiments({
+                "foo": {
                     "run": "PPO",
-                "trial_resources": {"asdf": 1}
-            }})
+                    "trial_resources": {
+                        "asdf": 1
+                    }
+                }
+            })
+
         self.assertRaises(TuneError, f)
 
     def testBadReturn(self):
         def train(config, reporter):
             reporter()
+
         register_trainable("f1", train)
 
         def f():
-            run_experiments({"foo": {
+            run_experiments({
+                "foo": {
                     "run": "f1",
                     "config": {
                         "script_min_iter_time_s": 0,
                     },
-            }})
+                }
+            })
+
         self.assertRaises(TuneError, f)
 
     def testEarlyReturn(self):
         def train(config, reporter):
             reporter(timesteps_total=100, done=True)
             time.sleep(99999)
+
         register_trainable("f1", train)
-        [trial] = run_experiments({"foo": {
+        [trial] = run_experiments({
+            "foo": {
                 "run": "f1",
                 "config": {
                     "script_min_iter_time_s": 0,
                 },
-        }})
+            }
+        })
         self.assertEqual(trial.status, Trial.TERMINATED)
         self.assertEqual(trial.last_result.timesteps_total, 100)
 
     def testAbruptReturn(self):
         def train(config, reporter):
             reporter(timesteps_total=100)
+
         register_trainable("f1", train)
-        [trial] = run_experiments({"foo": {
+        [trial] = run_experiments({
+            "foo": {
                 "run": "f1",
                 "config": {
                     "script_min_iter_time_s": 0,
                 },
-        }})
+            }
+        })
         self.assertEqual(trial.status, Trial.TERMINATED)
         self.assertEqual(trial.last_result.timesteps_total, 100)
 
     def testErrorReturn(self):
         def train(config, reporter):
             raise Exception("uh oh")
+
         register_trainable("f1", train)
 
         def f():
-            run_experiments({"foo": {
+            run_experiments({
+                "foo": {
                     "run": "f1",
                     "config": {
                         "script_min_iter_time_s": 0,
                     },
-            }})
+                }
+            })
+
         self.assertRaises(TuneError, f)
 
     def testSuccess(self):
         def train(config, reporter):
             for i in range(100):
                 reporter(timesteps_total=i)
+
         register_trainable("f1", train)
-        [trial] = run_experiments({"foo": {
+        [trial] = run_experiments({
+            "foo": {
                 "run": "f1",
                 "config": {
                     "script_min_iter_time_s": 0,
                 },
-        }})
+            }
+        })
         self.assertEqual(trial.status, Trial.TERMINATED)
         self.assertEqual(trial.last_result.timesteps_total, 99)
 
 
 class RunExperimentTest(unittest.TestCase):
-
     def setUp(self):
         ray.init()
 
@@ -228,6 +274,7 @@ class RunExperimentTest(unittest.TestCase):
         def train(config, reporter):
             for i in range(100):
                 reporter(timesteps_total=i)
+
         register_trainable("f1", train)
         trials = run_experiments({
             "foo": {
@@ -251,6 +298,7 @@ class RunExperimentTest(unittest.TestCase):
         def train(config, reporter):
             for i in range(100):
                 reporter(timesteps_total=i)
+
         register_trainable("f1", train)
         exp1 = Experiment(**{
             "name": "foo",
@@ -267,6 +315,7 @@ class RunExperimentTest(unittest.TestCase):
         def train(config, reporter):
             for i in range(100):
                 reporter(timesteps_total=i)
+
         register_trainable("f1", train)
         exp1 = Experiment(**{
             "name": "foo",
@@ -306,8 +355,7 @@ class VariantGeneratorTest(unittest.TestCase):
         self.assertEqual(trials[0].trainable_name, "PPO")
         self.assertEqual(trials[0].experiment_tag, "0")
         self.assertEqual(trials[0].max_failures, 5)
-        self.assertEqual(
-            trials[0].local_dir,
+        self.assertEqual(trials[0].local_dir,
                          os.path.join(DEFAULT_RESULTS_DIR, "tune-pong"))
         self.assertEqual(trials[1].experiment_tag, "1")
 
@@ -392,11 +440,13 @@ class VariantGeneratorTest(unittest.TestCase):
         trials = generate_trials({
             "run": "PPO",
             "config": {
-                "x": grid_search([
+                "x":
+                grid_search([
                     lambda spec: spec.config.y * 100,
                     lambda spec: spec.config.y * 200
                 ]),
-                "y": lambda spec: 1,
+                "y":
+                lambda spec: 1,
             },
         })
         trials = list(trials)
@@ -406,7 +456,8 @@ class VariantGeneratorTest(unittest.TestCase):
 
     def testRecursiveDep(self):
         try:
-            list(generate_trials({
+            list(
+                generate_trials({
                     "run": "PPO",
                     "config": {
                         "foo": lambda spec: spec.config.foo,
@@ -442,12 +493,15 @@ class TrialRunnerTest(unittest.TestCase):
 
         register_trainable("f1", train)
 
-        experiments = {"foo": {
+        experiments = {
+            "foo": {
                 "run": "f1",
                 "config": {
                     "a" * 50: lambda spec: 5.0 / 7,
-                "b" * 50: lambda spec: "long" * 40},
-        }}
+                    "b" * 50: lambda spec: "long" * 40
+                },
+            }
+        }
 
         for name, spec in experiments.items():
             for trial in generate_trials(spec, name):
@@ -468,12 +522,12 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=4, num_gpus=2)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 1},
+            "stopping_criterion": {
+                "training_iteration": 1
+            },
             "resources": Resources(cpu=1, gpu=0, extra_cpu=3, extra_gpu=1),
         }
-        trials = [
-            Trial("__fake", **kwargs),
-            Trial("__fake", **kwargs)]
+        trials = [Trial("__fake", **kwargs), Trial("__fake", **kwargs)]
         for t in trials:
             runner.add_trial(t)
 
@@ -489,12 +543,12 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=4, num_gpus=1)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 1},
+            "stopping_criterion": {
+                "training_iteration": 1
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
-        trials = [
-            Trial("__fake", **kwargs),
-            Trial("__fake", **kwargs)]
+        trials = [Trial("__fake", **kwargs), Trial("__fake", **kwargs)]
         for t in trials:
             runner.add_trial(t)
 
@@ -518,12 +572,12 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=4, num_gpus=2)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 5},
+            "stopping_criterion": {
+                "training_iteration": 5
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
-        trials = [
-            Trial("__fake", **kwargs),
-            Trial("__fake", **kwargs)]
+        trials = [Trial("__fake", **kwargs), Trial("__fake", **kwargs)]
         for t in trials:
             runner.add_trial(t)
 
@@ -547,13 +601,13 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=4, num_gpus=2)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 1},
+            "stopping_criterion": {
+                "training_iteration": 1
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
         _default_registry.register(TRAINABLE_CLASS, "asdf", None)
-        trials = [
-            Trial("asdf", **kwargs),
-            Trial("__fake", **kwargs)]
+        trials = [Trial("asdf", **kwargs), Trial("__fake", **kwargs)]
         for t in trials:
             runner.add_trial(t)
 
@@ -644,7 +698,9 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=1, num_gpus=1)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 1},
+            "stopping_criterion": {
+                "training_iteration": 1
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
         runner.add_trial(Trial("__fake", **kwargs))
@@ -675,7 +731,9 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=1, num_gpus=1)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 2},
+            "stopping_criterion": {
+                "training_iteration": 2
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
         runner.add_trial(Trial("__fake", **kwargs))
@@ -692,7 +750,9 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=1, num_gpus=1)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 2},
+            "stopping_criterion": {
+                "training_iteration": 2
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
         runner.add_trial(Trial("__fake", **kwargs))
@@ -721,14 +781,17 @@ class TrialRunnerTest(unittest.TestCase):
         ray.init(num_cpus=4, num_gpus=2)
         runner = TrialRunner()
         kwargs = {
-            "stopping_criterion": {"training_iteration": 5},
+            "stopping_criterion": {
+                "training_iteration": 5
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
         trials = [
             Trial("__fake", **kwargs),
             Trial("__fake", **kwargs),
             Trial("__fake", **kwargs),
-            Trial("__fake", **kwargs)]
+            Trial("__fake", **kwargs)
+        ]
         for t in trials:
             runner.add_trial(t)
         runner.step()

python/ray/tune/test/trial_scheduler_test.py

@@ -19,9 +19,8 @@ _register_all()
 
 
 def result(t, rew):
-    return TrainingResult(time_total_s=t,
-                          episode_reward_mean=rew,
-                          training_iteration=int(t))
+    return TrainingResult(
+        time_total_s=t, episode_reward_mean=rew, training_iteration=int(t))
 
 
 class EarlyStoppingSuite(unittest.TestCase):
@@ -76,8 +75,7 @@ class EarlyStoppingSuite(unittest.TestCase):
             rule.on_trial_result(None, t3, result(2, 10)),
             TrialScheduler.CONTINUE)
         self.assertEqual(
-            rule.on_trial_result(None, t3, result(3, 10)),
-            TrialScheduler.STOP)
+            rule.on_trial_result(None, t3, result(3, 10)), TrialScheduler.STOP)
 
     def testMedianStoppingMinSamples(self):
         rule = MedianStoppingRule(grace_period=0, min_samples_required=2)
@@ -89,8 +87,7 @@ class EarlyStoppingSuite(unittest.TestCase):
             TrialScheduler.CONTINUE)
         rule.on_trial_complete(None, t2, result(10, 1000))
         self.assertEqual(
-            rule.on_trial_result(None, t3, result(3, 10)),
-            TrialScheduler.STOP)
+            rule.on_trial_result(None, t3, result(3, 10)), TrialScheduler.STOP)
 
     def testMedianStoppingUsesMedian(self):
         rule = MedianStoppingRule(grace_period=0, min_samples_required=1)
@@ -124,8 +121,10 @@ class EarlyStoppingSuite(unittest.TestCase):
             return TrainingResult(training_iteration=t, neg_mean_loss=rew)
 
         rule = MedianStoppingRule(
-            grace_period=0, min_samples_required=1,
-            time_attr='training_iteration', reward_attr='neg_mean_loss')
+            grace_period=0,
+            min_samples_required=1,
+            time_attr='training_iteration',
+            reward_attr='neg_mean_loss')
         t1 = Trial("PPO")  # mean is 450, max 900, t_max=10
         t2 = Trial("PPO")  # mean is 450, max 450, t_max=5
         for i in range(10):
@@ -185,7 +184,6 @@ class _MockTrialRunner():
 
 
 class HyperbandSuite(unittest.TestCase):
-
     def schedulerSetup(self, num_trials):
         """Setup a scheduler and Runner with max Iter = 9
 
@@ -206,7 +204,10 @@ class HyperbandSuite(unittest.TestCase):
         """Default statistics for HyperBand"""
         sched = HyperBandScheduler()
         res = {
-            str(s): {"n": sched._get_n0(s), "r": sched._get_r0(s)}
+            str(s): {
+                "n": sched._get_n0(s),
+                "r": sched._get_r0(s)
+            }
             for s in range(sched._s_max_1)
         }
         res["max_trials"] = sum(v["n"] for v in res.values())
@@ -298,8 +299,8 @@ class HyperbandSuite(unittest.TestCase):
 
             # Provides results from 0 to 8 in order, keeping last one running
             for i, trl in enumerate(trials):
-                action = sched.on_trial_result(
-                    mock_runner, trl, result(cur_units, i))
+                action = sched.on_trial_result(mock_runner, trl,
+                                               result(cur_units, i))
                 if i < current_length - 1:
                     self.assertEqual(action, TrialScheduler.PAUSE)
                 mock_runner.process_action(trl, action)
@@ -321,8 +322,8 @@ class HyperbandSuite(unittest.TestCase):
         # # Provides result in reverse order, killing the last one
         cur_units = stats[str(1)]["r"]
         for i, trl in reversed(list(enumerate(big_bracket.current_trials()))):
-            action = sched.on_trial_result(
-                mock_runner, trl, result(cur_units, i))
+            action = sched.on_trial_result(mock_runner, trl,
+                                           result(cur_units, i))
             mock_runner.process_action(trl, action)
 
         self.assertEqual(action, TrialScheduler.STOP)
@@ -338,8 +339,8 @@ class HyperbandSuite(unittest.TestCase):
         # # Provides result in reverse order, killing the last one
         cur_units = stats[str(0)]["r"]
         for i, trl in enumerate(big_bracket.current_trials()):
-            action = sched.on_trial_result(
-                mock_runner, trl, result(cur_units, i))
+            action = sched.on_trial_result(mock_runner, trl,
+                                           result(cur_units, i))
             mock_runner.process_action(trl, action)
 
         self.assertEqual(action, TrialScheduler.STOP)
@@ -354,14 +355,12 @@ class HyperbandSuite(unittest.TestCase):
             mock_runner._launch_trial(t)
 
         sched.on_trial_error(mock_runner, t3)
-        self.assertEqual(
-            TrialScheduler.PAUSE,
-            sched.on_trial_result(
-                mock_runner, t1, result(stats[str(1)]["r"], 10)))
-        self.assertEqual(
-            TrialScheduler.CONTINUE,
-            sched.on_trial_result(
-                mock_runner, t2, result(stats[str(1)]["r"], 10)))
+        self.assertEqual(TrialScheduler.PAUSE,
+                         sched.on_trial_result(mock_runner, t1,
+                                               result(stats[str(1)]["r"], 10)))
+        self.assertEqual(TrialScheduler.CONTINUE,
+                         sched.on_trial_result(mock_runner, t2,
+                                               result(stats[str(1)]["r"], 10)))
 
     def testTrialErrored2(self):
         """Check successive halving happened even when last trial failed"""
@@ -371,12 +370,13 @@ class HyperbandSuite(unittest.TestCase):
         trials = sched._state["bracket"].current_trials()
         for t in trials[:-1]:
             mock_runner._launch_trial(t)
-            sched.on_trial_result(
-                mock_runner, t, result(stats[str(1)]["r"], 10))
+            sched.on_trial_result(mock_runner, t, result(
+                stats[str(1)]["r"], 10))
 
         mock_runner._launch_trial(trials[-1])
         sched.on_trial_error(mock_runner, trials[-1])
-        self.assertEqual(len(sched._state["bracket"].current_trials()),
+        self.assertEqual(
+            len(sched._state["bracket"].current_trials()),
             self.downscale(stats[str(1)]["n"], sched))
 
     def testTrialEndedEarly(self):
@@ -390,14 +390,12 @@ class HyperbandSuite(unittest.TestCase):
             mock_runner._launch_trial(t)
 
         sched.on_trial_complete(mock_runner, t3, result(1, 12))
-        self.assertEqual(
-            TrialScheduler.PAUSE,
-            sched.on_trial_result(
-                mock_runner, t1, result(stats[str(1)]["r"], 10)))
-        self.assertEqual(
-            TrialScheduler.CONTINUE,
-            sched.on_trial_result(
-                mock_runner, t2, result(stats[str(1)]["r"], 10)))
+        self.assertEqual(TrialScheduler.PAUSE,
+                         sched.on_trial_result(mock_runner, t1,
+                                               result(stats[str(1)]["r"], 10)))
+        self.assertEqual(TrialScheduler.CONTINUE,
+                         sched.on_trial_result(mock_runner, t2,
+                                               result(stats[str(1)]["r"], 10)))
 
     def testTrialEndedEarly2(self):
         """Check successive halving happened even when last trial failed"""
@@ -407,12 +405,13 @@ class HyperbandSuite(unittest.TestCase):
         trials = sched._state["bracket"].current_trials()
         for t in trials[:-1]:
             mock_runner._launch_trial(t)
-            sched.on_trial_result(
-                mock_runner, t, result(stats[str(1)]["r"], 10))
+            sched.on_trial_result(mock_runner, t, result(
+                stats[str(1)]["r"], 10))
 
         mock_runner._launch_trial(trials[-1])
         sched.on_trial_complete(mock_runner, trials[-1], result(100, 12))
-        self.assertEqual(len(sched._state["bracket"].current_trials()),
+        self.assertEqual(
+            len(sched._state["bracket"].current_trials()),
             self.downscale(stats[str(1)]["n"], sched))
 
     def testAddAfterHalving(self):
@@ -426,8 +425,8 @@ class HyperbandSuite(unittest.TestCase):
             mock_runner._launch_trial(t)
 
         for i, t in enumerate(bracket_trials):
-            action = sched.on_trial_result(
-                mock_runner, t, result(init_units, i))
+            action = sched.on_trial_result(mock_runner, t, result(
+                init_units, i))
         self.assertEqual(action, TrialScheduler.CONTINUE)
         t = Trial("__fake")
         sched.on_trial_add(None, t)
@@ -435,13 +434,13 @@ class HyperbandSuite(unittest.TestCase):
         self.assertEqual(len(sched._state["bracket"].current_trials()), 2)
 
         # Make sure that newly added trial gets fair computation (not just 1)
-        self.assertEqual(
-            TrialScheduler.CONTINUE,
-            sched.on_trial_result(mock_runner, t, result(init_units, 12)))
+        self.assertEqual(TrialScheduler.CONTINUE,
+                         sched.on_trial_result(mock_runner, t,
+                                               result(init_units, 12)))
         new_units = init_units + int(init_units * sched._eta)
-        self.assertEqual(
-            TrialScheduler.PAUSE,
-            sched.on_trial_result(mock_runner, t, result(new_units, 12)))
+        self.assertEqual(TrialScheduler.PAUSE,
+                         sched.on_trial_result(mock_runner, t,
+                                               result(new_units, 12)))
 
     def testAlternateMetrics(self):
         """Checking that alternate metrics will pass."""
@@ -539,7 +538,6 @@ class _MockTrial(Trial):
 
 
 class PopulationBasedTestingSuite(unittest.TestCase):
-
     def basicSetup(self, resample_prob=0.0, explore=None):
         pbt = PopulationBasedTraining(
             time_attr="training_iteration",
@@ -554,9 +552,12 @@ class PopulationBasedTestingSuite(unittest.TestCase):
         runner = _MockTrialRunner(pbt)
         for i in range(5):
             trial = _MockTrial(
-                i,
-                {"id_factor": i, "float_factor": 2.0, "const_factor": 3,
-                 "int_factor": 10})
+                i, {
+                    "id_factor": i,
+                    "float_factor": 2.0,
+                    "const_factor": 3,
+                    "int_factor": 10
+                })
             runner.add_trial(trial)
             trial.status = Trial.RUNNING
             self.assertEqual(
@@ -570,27 +571,23 @@ class PopulationBasedTestingSuite(unittest.TestCase):
         trials = runner.get_trials()
 
         # no checkpoint: haven't hit next perturbation interval yet
-        self.assertEqual(
-            pbt.last_scores(trials), [0, 50, 100, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [0, 50, 100, 150, 200])
         self.assertEqual(
             pbt.on_trial_result(runner, trials[0], result(15, 200)),
             TrialScheduler.CONTINUE)
-        self.assertEqual(
-            pbt.last_scores(trials), [0, 50, 100, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [0, 50, 100, 150, 200])
         self.assertEqual(pbt._num_checkpoints, 0)
 
         # checkpoint: both past interval and upper quantile
         self.assertEqual(
             pbt.on_trial_result(runner, trials[0], result(20, 200)),
             TrialScheduler.CONTINUE)
-        self.assertEqual(
-            pbt.last_scores(trials), [200, 50, 100, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [200, 50, 100, 150, 200])
         self.assertEqual(pbt._num_checkpoints, 1)
         self.assertEqual(
             pbt.on_trial_result(runner, trials[1], result(30, 201)),
             TrialScheduler.CONTINUE)
-        self.assertEqual(
-            pbt.last_scores(trials), [200, 201, 100, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [200, 201, 100, 150, 200])
         self.assertEqual(pbt._num_checkpoints, 2)
 
         # not upper quantile any more
@@ -608,8 +605,7 @@ class PopulationBasedTestingSuite(unittest.TestCase):
         self.assertEqual(
             pbt.on_trial_result(runner, trials[0], result(15, -100)),
             TrialScheduler.CONTINUE)
-        self.assertEqual(
-            pbt.last_scores(trials), [0, 50, 100, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [0, 50, 100, 150, 200])
         self.assertTrue("@perturbed" not in trials[0].experiment_tag)
         self.assertEqual(pbt._num_perturbations, 0)
 
@@ -617,8 +613,7 @@ class PopulationBasedTestingSuite(unittest.TestCase):
         self.assertEqual(
             pbt.on_trial_result(runner, trials[0], result(20, -100)),
             TrialScheduler.CONTINUE)
-        self.assertEqual(
-            pbt.last_scores(trials), [-100, 50, 100, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [-100, 50, 100, 150, 200])
         self.assertTrue("@perturbed" in trials[0].experiment_tag)
         self.assertIn(trials[0].restored_checkpoint, ["trial_3", "trial_4"])
         self.assertEqual(pbt._num_perturbations, 1)
@@ -627,8 +622,7 @@ class PopulationBasedTestingSuite(unittest.TestCase):
         self.assertEqual(
             pbt.on_trial_result(runner, trials[2], result(20, 40)),
             TrialScheduler.CONTINUE)
-        self.assertEqual(
-            pbt.last_scores(trials), [-100, 50, 40, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [-100, 50, 40, 150, 200])
         self.assertEqual(pbt._num_perturbations, 2)
         self.assertIn(trials[0].restored_checkpoint, ["trial_3", "trial_4"])
         self.assertTrue("@perturbed" in trials[2].experiment_tag)
@@ -662,7 +656,6 @@ class PopulationBasedTestingSuite(unittest.TestCase):
         self.assertEqual(trials[0].config["const_factor"], 3)
 
     def testPerturbationValues(self):
-
         def assertProduces(fn, values):
             random.seed(0)
             seen = set()
@@ -712,8 +705,7 @@ class PopulationBasedTestingSuite(unittest.TestCase):
         self.assertEqual(
             pbt.on_trial_result(runner, trials[1], result(20, 1000)),
             TrialScheduler.PAUSE)
-        self.assertEqual(
-            pbt.last_scores(trials), [0, 1000, 100, 150, 200])
+        self.assertEqual(pbt.last_scores(trials), [0, 1000, 100, 150, 200])
         self.assertEqual(pbt.choose_trial_to_run(runner), trials[0])
 
     def testSchedulesMostBehindTrialToRun(self):
@@ -748,6 +740,7 @@ class PopulationBasedTestingSuite(unittest.TestCase):
             new_config["id_factor"] = 42
             new_config["float_factor"] = 43
             return new_config
+
         pbt, runner = self.basicSetup(resample_prob=0.0, explore=explore)
         trials = runner.get_trials()
         self.assertEqual(
@@ -774,8 +767,7 @@ class AsyncHyperBandSuite(unittest.TestCase):
         return t1, t2
 
     def testAsyncHBOnComplete(self):
-        scheduler = AsyncHyperBandScheduler(
-            max_t=10, brackets=1)
+        scheduler = AsyncHyperBandScheduler(max_t=10, brackets=1)
         t1, t2 = self.basicSetup(scheduler)
         t3 = Trial("PPO")
         scheduler.on_trial_add(None, t3)
@@ -803,8 +795,7 @@ class AsyncHyperBandSuite(unittest.TestCase):
             TrialScheduler.STOP)
 
     def testAsyncHBAllCompletes(self):
-        scheduler = AsyncHyperBandScheduler(
-            max_t=10, brackets=10)
+        scheduler = AsyncHyperBandScheduler(max_t=10, brackets=10)
         trials = [Trial("PPO") for i in range(10)]
         for t in trials:
             scheduler.on_trial_add(None, t)
@@ -834,8 +825,10 @@ class AsyncHyperBandSuite(unittest.TestCase):
             return TrainingResult(training_iteration=t, neg_mean_loss=rew)
 
         scheduler = AsyncHyperBandScheduler(
-            grace_period=1, time_attr='training_iteration',
-            reward_attr='neg_mean_loss', brackets=1)
+            grace_period=1,
+            time_attr='training_iteration',
+            reward_attr='neg_mean_loss',
+            brackets=1)
         t1 = Trial("PPO")  # mean is 450, max 900, t_max=10
         t2 = Trial("PPO")  # mean is 450, max 450, t_max=5
         scheduler.on_trial_add(None, t1)

python/ray/tune/test/tune_server_test.py

@@ -30,16 +30,15 @@ class TuneServerSuite(unittest.TestCase):
     def basicSetup(self):
         ray.init(num_cpus=4, num_gpus=1)
         port = get_valid_port()
-        self.runner = TrialRunner(
-            launch_web_server=True, server_port=port)
+        self.runner = TrialRunner(launch_web_server=True, server_port=port)
         runner = self.runner
         kwargs = {
-            "stopping_criterion": {"training_iteration": 3},
+            "stopping_criterion": {
+                "training_iteration": 3
+            },
             "resources": Resources(cpu=1, gpu=1),
         }
-        trials = [
-            Trial("__fake", **kwargs),
-            Trial("__fake", **kwargs)]
+        trials = [Trial("__fake", **kwargs), Trial("__fake", **kwargs)]
         for t in trials:
             runner.add_trial(t)
         client = TuneClient("localhost:{}".format(port))
@@ -61,7 +60,9 @@ class TuneServerSuite(unittest.TestCase):
             runner.step()
         spec = {
             "run": "__fake",
-            "stop": {"training_iteration": 3},
+            "stop": {
+                "training_iteration": 3
+            },
             "trial_resources": dict(cpu=1, gpu=1),
         }
         client.add_trial("test", spec)

python/ray/tune/trainable.py

@@ -114,8 +114,8 @@ class Trainable(object):
             time_this_iter = time.time() - start
 
         if result.timesteps_this_iter is None:
-            raise TuneError(
-                "Must specify timesteps_this_iter in result", result)
+            raise TuneError("Must specify timesteps_this_iter in result",
+                            result)
 
         self._time_total += time_this_iter
         self._timesteps_total += result.timesteps_this_iter
@@ -159,10 +159,10 @@ class Trainable(object):
         """
 
         checkpoint_path = self._save(checkpoint_dir or self.logdir)
-        pickle.dump(
-            [self._experiment_id, self._iteration, self._timesteps_total,
-             self._time_total],
-            open(checkpoint_path + ".tune_metadata", "wb"))
+        pickle.dump([
+            self._experiment_id, self._iteration, self._timesteps_total,
+            self._time_total
+        ], open(checkpoint_path + ".tune_metadata", "wb"))
         return checkpoint_path
 
     def save_to_object(self):
@@ -186,8 +186,10 @@ class Trainable(object):
         out = io.BytesIO()
         with gzip.GzipFile(fileobj=out, mode="wb") as f:
             compressed = pickle.dumps({
-                "checkpoint_name": os.path.basename(checkpoint_prefix),
-                "data": data,
+                "checkpoint_name":
+                os.path.basename(checkpoint_prefix),
+                "data":
+                data,
             })
             if len(compressed) > 10e6:  # getting pretty large
                 print("Checkpoint size is {} bytes".format(len(compressed)))

python/ray/tune/trial.py

@@ -42,12 +42,12 @@ class Resources(
     __slots__ = ()
 
     def __new__(cls, cpu, gpu, extra_cpu=0, extra_gpu=0):
-        return super(Resources, cls).__new__(
-            cls, cpu, gpu, extra_cpu, extra_gpu)
+        return super(Resources, cls).__new__(cls, cpu, gpu, extra_cpu,
+                                             extra_gpu)
 
     def summary_string(self):
-        return "{} CPUs, {} GPUs".format(
-            self.cpu + self.extra_cpu, self.gpu + self.extra_gpu)
+        return "{} CPUs, {} GPUs".format(self.cpu + self.extra_cpu,
+                                         self.gpu + self.extra_gpu)
 
     def cpu_total(self):
         return self.cpu + self.extra_cpu
@@ -77,11 +77,17 @@ class Trial(object):
     TERMINATED = "TERMINATED"
     ERROR = "ERROR"
 
-    def __init__(
-            self, trainable_name, config=None, local_dir=DEFAULT_RESULTS_DIR,
-            experiment_tag="", resources=Resources(cpu=1, gpu=0),
-            stopping_criterion=None, checkpoint_freq=0,
-            restore_path=None, upload_dir=None, max_failures=0):
+    def __init__(self,
+                 trainable_name,
+                 config=None,
+                 local_dir=DEFAULT_RESULTS_DIR,
+                 experiment_tag="",
+                 resources=Resources(cpu=1, gpu=0),
+                 stopping_criterion=None,
+                 checkpoint_freq=0,
+                 restore_path=None,
+                 upload_dir=None,
+                 max_failures=0):
         """Initialize a new trial.
 
         The args here take the same meaning as the command line flags defined
@@ -166,15 +172,16 @@ class Trial(object):
         try:
             if error_msg and self.logdir:
                 self.num_failures += 1
-                error_file = os.path.join(
-                    self.logdir, "error_{}.txt".format(date_str()))
+                error_file = os.path.join(self.logdir, "error_{}.txt".format(
+                    date_str()))
                 with open(error_file, "w") as f:
                     f.write(error_msg)
                 self.error_file = error_file
             if self.runner:
                 stop_tasks = []
                 stop_tasks.append(self.runner.stop.remote())
-                stop_tasks.append(self.runner.__ray_terminate__.remote(
+                stop_tasks.append(
+                    self.runner.__ray_terminate__.remote(
                         self.runner._ray_actor_id.id()))
                 # TODO(ekl)  seems like wait hangs when killing actors
                 _, unfinished = ray.wait(
@@ -252,12 +259,12 @@ class Trial(object):
                 return '{} pid={}'.format(hostname, pid)
 
         pieces = [
-            '{} [{}]'.format(
-                self._status_string(),
-                location_string(
-                    self.last_result.hostname, self.last_result.pid)),
-            '{} s'.format(int(self.last_result.time_total_s)),
-            '{} ts'.format(int(self.last_result.timesteps_total))]
+            '{} [{}]'.format(self._status_string(),
+                             location_string(self.last_result.hostname,
+                                             self.last_result.pid)),
+            '{} s'.format(int(self.last_result.time_total_s)), '{} ts'.format(
+                int(self.last_result.timesteps_total))
+        ]
 
         if self.last_result.episode_reward_mean is not None:
             pieces.append('{} rew'.format(
@@ -274,10 +281,8 @@ class Trial(object):
         return ', '.join(pieces)
 
     def _status_string(self):
-        return "{}{}".format(
-            self.status,
-            ", {} failures: {}".format(self.num_failures, self.error_file)
-            if self.error_file else "")
+        return "{}{}".format(self.status, ", {} failures: {}".format(
+            self.num_failures, self.error_file) if self.error_file else "")
 
     def has_checkpoint(self):
         return self._checkpoint_path is not None or \
@@ -335,9 +340,8 @@ class Trial(object):
     def update_last_result(self, result, terminate=False):
         if terminate:
             result = result._replace(done=True)
-        if self.verbose and (
-                terminate or
-                time.time() - self.last_debug > DEBUG_PRINT_INTERVAL):
+        if self.verbose and (terminate or time.time() - self.last_debug >
+                             DEBUG_PRINT_INTERVAL):
             print("TrainingResult for {}:".format(self))
             print("  {}".format(pretty_print(result).replace("\n", "\n  ")))
             self.last_debug = time.time()
@@ -358,8 +362,8 @@ class Trial(object):
                 prefix="{}_{}".format(
                     str(self)[:MAX_LEN_IDENTIFIER], date_str()),
                 dir=self.local_dir)
-            self.result_logger = UnifiedLogger(
-                self.config, self.logdir, self.upload_dir)
+            self.result_logger = UnifiedLogger(self.config, self.logdir,
+                                               self.upload_dir)
         remote_logdir = self.logdir
 
         def logger_creator(config):
@@ -372,7 +376,8 @@ class Trial(object):
         # Logging for trials is handled centrally by TrialRunner, so
         # configure the remote runner to use a noop-logger.
         self.runner = cls.remote(
-            config=self.config, registry=ray.tune.registry.get_registry(),
+            config=self.config,
+            registry=ray.tune.registry.get_registry(),
             logger_creator=logger_creator)
 
     def set_verbose(self, verbose):
@@ -387,8 +392,8 @@ class Trial(object):
     def __str__(self):
         """Combines ``env`` with ``trainable_name`` and ``experiment_tag``."""
         if "env" in self.config:
-            identifier = "{}_{}".format(
-                self.trainable_name, self.config["env"])
+            identifier = "{}_{}".format(self.trainable_name,
+                                        self.config["env"])
         else:
             identifier = self.trainable_name
         if self.experiment_tag:

python/ray/tune/trial_runner.py

@@ -13,7 +13,6 @@ from ray.tune.web_server import TuneServer
 from ray.tune.trial import Trial, Resources
 from ray.tune.trial_scheduler import FIFOScheduler, TrialScheduler
 
-
 MAX_DEBUG_TRIALS = 20
 
 
@@ -39,8 +38,11 @@ class TrialRunner(object):
     misleading benchmark results.
     """
 
-    def __init__(self, scheduler=None, launch_web_server=False,
-                 server_port=TuneServer.DEFAULT_PORT, verbose=True):
+    def __init__(self,
+                 scheduler=None,
+                 launch_web_server=False,
+                 server_port=TuneServer.DEFAULT_PORT,
+                 verbose=True):
         """Initializes a new TrialRunner.
 
         Args:
@@ -73,8 +75,7 @@ class TrialRunner(object):
         """Returns whether all trials have finished running."""
 
         if self._total_time > self._global_time_limit:
-            print(
-                "Exceeded global time limit {} / {}".format(
+            print("Exceeded global time limit {} / {}".format(
                 self._total_time, self._global_time_limit))
             return True
 
@@ -98,8 +99,8 @@ class TrialRunner(object):
             for trial in self._trials:
                 if trial.status == Trial.PENDING:
                     if not self.has_resources(trial.resources):
-                        raise TuneError((
-                            "Insufficient cluster resources to launch trial: "
+                        raise TuneError(
+                            ("Insufficient cluster resources to launch trial: "
                              "trial requested {} but the cluster only has {} "
                              "available.").format(
                                  trial.resources.summary_string(),
@@ -165,24 +166,20 @@ class TrialRunner(object):
         for state, trials in sorted(states.items()):
             limit = limit_per_state[state]
             messages.append("{} trials:".format(state))
-            for t in sorted(
-                    trials, key=lambda t: t.experiment_tag)[:limit]:
+            for t in sorted(trials, key=lambda t: t.experiment_tag)[:limit]:
                 messages.append(" - {}:\t{}".format(t, t.progress_string()))
             if len(trials) > limit:
-                messages.append("  ... {} more not shown".format(
-                    len(trials) - limit))
+                messages.append(
+                    "  ... {} more not shown".format(len(trials) - limit))
         return "\n".join(messages) + "\n"
 
     def _debug_messages(self):
         messages = ["== Status =="]
         messages.append(self._scheduler_alg.debug_string())
         if self._resources_initialized:
-            messages.append(
-                "Resources used: {}/{} CPUs, {}/{} GPUs".format(
-                    self._committed_resources.cpu,
-                    self._avail_resources.cpu,
-                    self._committed_resources.gpu,
-                    self._avail_resources.gpu))
+            messages.append("Resources used: {}/{} CPUs, {}/{} GPUs".format(
+                self._committed_resources.cpu, self._avail_resources.cpu,
+                self._committed_resources.gpu, self._avail_resources.gpu))
         return messages
 
     def has_resources(self, resources):
@@ -190,9 +187,8 @@ class TrialRunner(object):
 
         cpu_avail = self._avail_resources.cpu - self._committed_resources.cpu
         gpu_avail = self._avail_resources.gpu - self._committed_resources.gpu
-        return (
-            resources.cpu_total() <= cpu_avail and
-            resources.gpu_total() <= gpu_avail)
+        return (resources.cpu_total() <= cpu_avail
+                and resources.gpu_total() <= gpu_avail)
 
     def _get_next_trial(self):
         self._update_avail_resources()
@@ -307,8 +303,9 @@ class TrialRunner(object):
             self._scheduler_alg.on_trial_remove(self, trial)
         elif trial.status is Trial.RUNNING:
             # NOTE: There should only be one...
-            result_id = [rid for rid, t in self._running.items()
-                         if t is trial][0]
+            result_id = [
+                rid for rid, t in self._running.items() if t is trial
+            ][0]
             self._running.pop(result_id)
             try:
                 result = ray.get(result_id)
@@ -339,9 +336,8 @@ class TrialRunner(object):
     def _update_avail_resources(self):
         clients = ray.global_state.client_table()
         local_schedulers = [
-            entry for client in clients.values() for entry in client
-            if (entry['ClientType'] == 'local_scheduler' and not
-                entry['Deleted'])
+            entry for client in clients.values() for entry in client if
+            (entry['ClientType'] == 'local_scheduler' and not entry['Deleted'])
         ]
         num_cpus = sum(ls['CPU'] for ls in local_schedulers)
         num_gpus = sum(ls.get('GPU', 0) for ls in local_schedulers)

python/ray/tune/trial_scheduler.py

@@ -99,12 +99,12 @@ class FIFOScheduler(TrialScheduler):
 
     def choose_trial_to_run(self, trial_runner):
         for trial in trial_runner.get_trials():
-            if (trial.status == Trial.PENDING and
-                    trial_runner.has_resources(trial.resources)):
+            if (trial.status == Trial.PENDING
+                    and trial_runner.has_resources(trial.resources)):
                 return trial
         for trial in trial_runner.get_trials():
-            if (trial.status == Trial.PAUSED and
-                    trial_runner.has_resources(trial.resources)):
+            if (trial.status == Trial.PAUSED
+                    and trial_runner.has_resources(trial.resources)):
                 return trial
         return None
 

python/ray/tune/tune.py

@@ -16,7 +16,6 @@ from ray.tune.trial_scheduler import FIFOScheduler
 from ray.tune.web_server import TuneServer
 from ray.tune.experiment import Experiment
 
-
 _SCHEDULERS = {
     "FIFO": FIFOScheduler,
     "MedianStopping": MedianStoppingRule,
@@ -30,13 +29,15 @@ def _make_scheduler(args):
     if args.scheduler in _SCHEDULERS:
         return _SCHEDULERS[args.scheduler](**args.scheduler_config)
     else:
-        raise TuneError(
-            "Unknown scheduler: {}, should be one of {}".format(
+        raise TuneError("Unknown scheduler: {}, should be one of {}".format(
             args.scheduler, _SCHEDULERS.keys()))
 
 
-def run_experiments(experiments, scheduler=None, with_server=False,
-                    server_port=TuneServer.DEFAULT_PORT, verbose=True):
+def run_experiments(experiments,
+                    scheduler=None,
+                    with_server=False,
+                    server_port=TuneServer.DEFAULT_PORT,
+                    verbose=True):
     """Tunes experiments.
 
     Args:
@@ -54,17 +55,21 @@ def run_experiments(experiments, scheduler=None, with_server=False,
         scheduler = FIFOScheduler()
 
     runner = TrialRunner(
-        scheduler, launch_web_server=with_server, server_port=server_port,
+        scheduler,
+        launch_web_server=with_server,
+        server_port=server_port,
         verbose=verbose)
     exp_list = experiments
     if isinstance(experiments, Experiment):
         exp_list = [experiments]
     elif type(experiments) is dict:
-        exp_list = [Experiment.from_json(name, spec)
-                    for name, spec in experiments.items()]
+        exp_list = [
+            Experiment.from_json(name, spec)
+            for name, spec in experiments.items()
+        ]
 
-    if (type(exp_list) is list and
-            all(isinstance(exp, Experiment) for exp in exp_list)):
+    if (type(exp_list) is list
+            and all(isinstance(exp, Experiment) for exp in exp_list)):
         for experiment in exp_list:
             scheduler.add_experiment(experiment, runner)
     else:

python/ray/tune/util.py

@@ -7,7 +7,6 @@ import base64
 import ray
 from ray.tune.registry import _to_pinnable, _from_pinnable
 
-
 _pinned_objects = []
 PINNED_OBJECT_PREFIX = "ray.tune.PinnedObject:"
 
@@ -15,14 +14,15 @@ PINNED_OBJECT_PREFIX = "ray.tune.PinnedObject:"
 def pin_in_object_store(obj):
     obj_id = ray.put(_to_pinnable(obj))
     _pinned_objects.append(ray.get(obj_id))
-    return "{}{}".format(
-        PINNED_OBJECT_PREFIX, base64.b64encode(obj_id.id()).decode("utf-8"))
+    return "{}{}".format(PINNED_OBJECT_PREFIX,
+                         base64.b64encode(obj_id.id()).decode("utf-8"))
 
 
 def get_pinned_object(pinned_id):
     from ray.local_scheduler import ObjectID
-    return _from_pinnable(ray.get(ObjectID(
-        base64.b64decode(pinned_id[len(PINNED_OBJECT_PREFIX):]))))
+    return _from_pinnable(
+        ray.get(
+            ObjectID(base64.b64decode(pinned_id[len(PINNED_OBJECT_PREFIX):]))))
 
 
 if __name__ == '__main__':

python/ray/tune/variant_generator.py

@@ -163,8 +163,8 @@ def _generate_variants(spec):
             for path, value in grid_vars:
                 resolved_vars[path] = _get_value(spec, path)
             for k, v in resolved.items():
-                if (k in resolved_vars and v != resolved_vars[k] and
-                        _is_resolved(resolved_vars[k])):
+                if (k in resolved_vars and v != resolved_vars[k]
+                        and _is_resolved(resolved_vars[k])):
                     raise ValueError(
                         "The variable `{}` could not be unambiguously "
                         "resolved to a single value. Consider simplifying "
@@ -262,16 +262,16 @@ def _unresolved_values(spec):
     for k, v in spec.items():
         resolved, v = _try_resolve(v)
         if not resolved:
-            found[(k,)] = v
+            found[(k, )] = v
         elif isinstance(v, dict):
             # Recurse into a dict
             for (path, value) in _unresolved_values(v).items():
-                found[(k,) + path] = value
+                found[(k, ) + path] = value
         elif isinstance(v, list):
             # Recurse into a list
             for i, elem in enumerate(v):
                 for (path, value) in _unresolved_values({i: elem}).items():
-                    found[(k,) + path] = value
+                    found[(k, ) + path] = value
     return found
 
 

python/ray/tune/visual_utils.py

@@ -61,8 +61,10 @@ def _resolve(directory, result_fname):
 
 
 def load_results_to_df(directory, result_name="result.json"):
-    exp_directories = [dirpath for dirpath, dirs, files in os.walk(directory)
-                       for f in files if f == result_name]
+    exp_directories = [
+        dirpath for dirpath, dirs, files in os.walk(directory) for f in files
+        if f == result_name
+    ]
     data = [_resolve(d, result_name) for d in exp_directories]
     data = [d for d in data if d]
     return pd.DataFrame(data)
@@ -76,8 +78,9 @@ def generate_plotly_dim_dict(df, field):
         dim_dict["values"] = column
     elif is_string_dtype(column):
         texts = column.unique()
-        dim_dict["values"] = [np.argwhere(texts == x).flatten()[0]
-                              for x in column]
+        dim_dict["values"] = [
+            np.argwhere(texts == x).flatten()[0] for x in column
+        ]
         dim_dict["tickvals"] = list(range(len(texts)))
         dim_dict["ticktext"] = texts
     else:

python/ray/tune/web_server.py

@@ -39,28 +39,30 @@ class TuneClient(object):
 
     def get_all_trials(self):
         """Returns a list of all trials (trial_id, config, status)."""
-        return self._get_response(
-            {"command": TuneClient.GET_LIST})
+        return self._get_response({"command": TuneClient.GET_LIST})
 
     def get_trial(self, trial_id):
         """Returns the last result for queried trial."""
-        return self._get_response(
-            {"command": TuneClient.GET_TRIAL,
-             "trial_id": trial_id})
+        return self._get_response({
+            "command": TuneClient.GET_TRIAL,
+            "trial_id": trial_id
+        })
 
     def add_trial(self, name, trial_spec):
         """Adds a trial of `name` with configurations."""
         # TODO(rliaw): have better way of specifying a new trial
-        return self._get_response(
-            {"command": TuneClient.ADD,
+        return self._get_response({
+            "command": TuneClient.ADD,
             "name": name,
-             "spec": trial_spec})
+            "spec": trial_spec
+        })
 
     def stop_trial(self, trial_id):
         """Requests to stop trial."""
-        return self._get_response(
-            {"command": TuneClient.STOP,
-             "trial_id": trial_id})
+        return self._get_response({
+            "command": TuneClient.STOP,
+            "trial_id": trial_id
+        })
 
     def _get_response(self, data):
         payload = json.dumps(data).encode()
@@ -71,7 +73,6 @@ class TuneClient(object):
 
 def RunnerHandler(runner):
     class Handler(SimpleHTTPRequestHandler):
-
         def do_GET(self):
             content_len = int(self.headers.get('Content-Length'), 0)
             raw_body = self.rfile.read(content_len)
@@ -82,8 +83,7 @@ def RunnerHandler(runner):
             else:
                 self.send_response(400)
             self.end_headers()
-            self.wfile.write(json.dumps(
-                response).encode())
+            self.wfile.write(json.dumps(response).encode())
 
         def trial_info(self, trial):
             if trial.last_result:
@@ -112,8 +112,9 @@ def RunnerHandler(runner):
             response = {}
             try:
                 if command == TuneClient.GET_LIST:
-                    response["trials"] = [self.trial_info(t)
-                                          for t in runner.get_trials()]
+                    response["trials"] = [
+                        self.trial_info(t) for t in runner.get_trials()
+                    ]
                 elif command == TuneClient.GET_TRIAL:
                     trial = get_trial()
                     response["trial_info"] = self.trial_info(trial)
@@ -147,8 +148,7 @@ class TuneServer(threading.Thread):
         self._port = port if port else self.DEFAULT_PORT
         address = ('localhost', self._port)
         print("Starting Tune Server...")
-        self._server = HTTPServer(
-            address, RunnerHandler(runner))
+        self._server = HTTPServer(address, RunnerHandler(runner))
         self.start()
 
     def run(self):

python/ray/utils.py

@@ -46,7 +46,10 @@ def format_error_message(exception_message, task_exception=False):
     return "\n".join(lines)
 
 
-def push_error_to_driver(redis_client, error_type, message, driver_id=None,
+def push_error_to_driver(redis_client,
+                         error_type,
+                         message,
+                         driver_id=None,
                          data=None):
     """Push an error message to the driver to be printed in the background.
 
@@ -64,9 +67,11 @@ def push_error_to_driver(redis_client, error_type, message, driver_id=None,
         driver_id = DRIVER_ID_LENGTH * b"\x00"
     error_key = ERROR_KEY_PREFIX + driver_id + b":" + _random_string()
     data = {} if data is None else data
-    redis_client.hmset(error_key, {"type": error_type,
+    redis_client.hmset(error_key, {
+        "type": error_type,
         "message": message,
-                                   "data": data})
+        "data": data
+    })
     redis_client.rpush("ErrorKeys", error_key)
 
 
@@ -134,10 +139,8 @@ def hex_to_binary(hex_identifier):
     return binascii.unhexlify(hex_identifier)
 
 
-FunctionProperties = collections.namedtuple("FunctionProperties",
-                                            ["num_return_vals",
-                                             "resources",
-                                             "max_calls"])
+FunctionProperties = collections.namedtuple(
+    "FunctionProperties", ["num_return_vals", "resources", "max_calls"])
 """FunctionProperties: A named tuple storing remote functions information."""
 
 

python/ray/workers/default_worker.py

@@ -8,34 +8,51 @@ import traceback
 import ray
 import ray.actor
 
-parser = argparse.ArgumentParser(description=("Parse addresses for the worker "
+parser = argparse.ArgumentParser(
+    description=("Parse addresses for the worker "
                  "to connect to."))
-parser.add_argument("--node-ip-address", required=True, type=str,
+parser.add_argument(
+    "--node-ip-address",
+    required=True,
+    type=str,
     help="the ip address of the worker's node")
-parser.add_argument("--redis-address", required=True, type=str,
+parser.add_argument(
+    "--redis-address",
+    required=True,
+    type=str,
     help="the address to use for Redis")
-parser.add_argument("--object-store-name", required=True, type=str,
+parser.add_argument(
+    "--object-store-name",
+    required=True,
+    type=str,
     help="the object store's name")
-parser.add_argument("--object-store-manager-name", required=False, type=str,
+parser.add_argument(
+    "--object-store-manager-name",
+    required=False,
+    type=str,
     help="the object store manager's name")
-parser.add_argument("--local-scheduler-name", required=False, type=str,
+parser.add_argument(
+    "--local-scheduler-name",
+    required=False,
+    type=str,
     help="the local scheduler's name")
-parser.add_argument("--raylet-name", required=False, type=str,
-                    help="the raylet's name")
-
+parser.add_argument(
+    "--raylet-name", required=False, type=str, help="the raylet's name")
 
 if __name__ == "__main__":
     args = parser.parse_args()
 
-    info = {"node_ip_address": args.node_ip_address,
+    info = {
+        "node_ip_address": args.node_ip_address,
         "redis_address": args.redis_address,
         "store_socket_name": args.object_store_name,
         "manager_socket_name": args.object_store_manager_name,
         "local_scheduler_socket_name": args.local_scheduler_name,
-            "raylet_socket_name": args.raylet_name}
+        "raylet_socket_name": args.raylet_name
+    }
 
-    ray.worker.connect(info, mode=ray.WORKER_MODE,
-                       use_raylet=(args.raylet_name is not None))
+    ray.worker.connect(
+        info, mode=ray.WORKER_MODE, use_raylet=(args.raylet_name is not None))
 
     error_explanation = """
   This error is unexpected and should not have happened. Somehow a worker
@@ -54,8 +71,8 @@ if __name__ == "__main__":
         traceback_str = traceback.format_exc() + error_explanation
         # Create a Redis client.
         redis_client = ray.services.create_redis_client(args.redis_address)
-        ray.utils.push_error_to_driver(redis_client, "worker_crash",
-                                       traceback_str, driver_id=None)
+        ray.utils.push_error_to_driver(
+            redis_client, "worker_crash", traceback_str, driver_id=None)
         # TODO(rkn): Note that if the worker was in the middle of executing
         # a task, then any worker or driver that is blocking in a get call
         # and waiting for the output of that task will hang. We need to

python/setup.py

@@ -18,13 +18,11 @@ import setuptools.command.build_ext as _build_ext
 ray_files = [
     "ray/core/src/common/thirdparty/redis/src/redis-server",
     "ray/core/src/common/redis_module/libray_redis_module.so",
-    "ray/core/src/plasma/plasma_store",
-    "ray/core/src/plasma/plasma_manager",
+    "ray/core/src/plasma/plasma_store", "ray/core/src/plasma/plasma_manager",
     "ray/core/src/local_scheduler/local_scheduler",
     "ray/core/src/local_scheduler/liblocal_scheduler_library.so",
     "ray/core/src/global_scheduler/global_scheduler",
-    "ray/core/src/ray/raylet/raylet_monitor",
-    "ray/core/src/ray/raylet/raylet",
+    "ray/core/src/ray/raylet/raylet_monitor", "ray/core/src/ray/raylet/raylet",
     "ray/WebUI.ipynb"
 ]
 
@@ -35,14 +33,14 @@ ray_ui_files = [
     "ray/core/src/catapult_files/trace_viewer_full.html"
 ]
 
-ray_autoscaler_files = [
-    "ray/autoscaler/aws/example-full.yaml"
-]
+ray_autoscaler_files = ["ray/autoscaler/aws/example-full.yaml"]
 
 if "RAY_USE_NEW_GCS" in os.environ and os.environ["RAY_USE_NEW_GCS"] == "on":
-    ray_files += ["ray/core/src/credis/build/src/libmember.so",
+    ray_files += [
+        "ray/core/src/credis/build/src/libmember.so",
         "ray/core/src/credis/build/src/libmaster.so",
-                  "ray/core/src/credis/redis/src/redis-server"]
+        "ray/core/src/credis/redis/src/redis-server"
+    ]
 
 # The UI files are mandatory if the INCLUDE_UI environment variable equals 1.
 # Otherwise, they are optional.
@@ -54,9 +52,8 @@ else:
 optional_ray_files += ray_autoscaler_files
 
 extras = {
-    "rllib": [
-        "tensorflow", "pyyaml", "gym[atari]", "opencv-python",
-        "lz4", "scipy"]
+    "rllib":
+    ["tensorflow", "pyyaml", "gym[atari]", "opencv-python", "lz4", "scipy"]
 }
 
 
@@ -73,8 +70,9 @@ class build_ext(_build_ext.build_ext):
         pyarrow_files = [
             os.path.join("ray/pyarrow_files/pyarrow", filename)
             for filename in os.listdir("./ray/pyarrow_files/pyarrow")
-            if not os.path.isdir(os.path.join("ray/pyarrow_files/pyarrow",
-                                              filename))]
+            if not os.path.isdir(
+                os.path.join("ray/pyarrow_files/pyarrow", filename))
+        ]
 
         files_to_include = ray_files + pyarrow_files
 
@@ -84,8 +82,8 @@ class build_ext(_build_ext.build_ext):
         generated_python_directory = "ray/core/generated"
         for filename in os.listdir(generated_python_directory):
             if filename[-3:] == ".py":
-                self.move_file(os.path.join(generated_python_directory,
-                                            filename))
+                self.move_file(
+                    os.path.join(generated_python_directory, filename))
 
         # Try to copy over the optional files.
         for filename in optional_ray_files:
@@ -114,14 +112,16 @@ class BinaryDistribution(Distribution):
         return True
 
 
-setup(name="ray",
+setup(
+    name="ray",
     # The version string is also in __init__.py. TODO(pcm): Fix this.
     version="0.4.0",
     packages=find_packages(),
     cmdclass={"build_ext": build_ext},
     # The BinaryDistribution argument triggers build_ext.
     distclass=BinaryDistribution,
-      install_requires=["numpy",
+    install_requires=[
+        "numpy",
         "funcsigs",
         "click",
         "colorama",
@@ -131,7 +131,8 @@ setup(name="ray",
         "redis",
         # The six module is required by pyarrow.
         "six >= 1.0.0",
-                        "flatbuffers"],
+        "flatbuffers"
+    ],
     setup_requires=["cython >= 0.23"],
     extras_require=extras,
     entry_points={"console_scripts": ["ray=ray.scripts.scripts:main"]},

test/actor_test.py

@@ -15,7 +15,6 @@ import ray.test.test_utils
 
 
 class ActorAPI(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -39,19 +38,21 @@ class ActorAPI(unittest.TestCase):
         self.assertEqual(ray.get(actor.get_values.remote(2, 3)), (3, 5, "ab"))
 
         actor = Actor.remote(1, 2, "c")
-        self.assertEqual(ray.get(actor.get_values.remote(2, 3, "d")),
-                         (3, 5, "cd"))
+        self.assertEqual(
+            ray.get(actor.get_values.remote(2, 3, "d")), (3, 5, "cd"))
 
         actor = Actor.remote(1, arg2="c")
-        self.assertEqual(ray.get(actor.get_values.remote(0, arg2="d")),
-                         (1, 3, "cd"))
-        self.assertEqual(ray.get(actor.get_values.remote(0, arg2="d", arg1=0)),
+        self.assertEqual(
+            ray.get(actor.get_values.remote(0, arg2="d")), (1, 3, "cd"))
+        self.assertEqual(
+            ray.get(actor.get_values.remote(0, arg2="d", arg1=0)),
             (1, 1, "cd"))
 
         actor = Actor.remote(1, arg2="c", arg1=2)
-        self.assertEqual(ray.get(actor.get_values.remote(0, arg2="d")),
-                         (1, 4, "cd"))
-        self.assertEqual(ray.get(actor.get_values.remote(0, arg2="d", arg1=0)),
+        self.assertEqual(
+            ray.get(actor.get_values.remote(0, arg2="d")), (1, 4, "cd"))
+        self.assertEqual(
+            ray.get(actor.get_values.remote(0, arg2="d", arg1=0)),
             (1, 2, "cd"))
 
         # Make sure we get an exception if the constructor is called
@@ -84,15 +85,17 @@ class ActorAPI(unittest.TestCase):
         self.assertEqual(ray.get(actor.get_values.remote(1)), (1, 3, (), ()))
 
         actor = Actor.remote(1, 2)
-        self.assertEqual(ray.get(actor.get_values.remote(2, 3)),
-                         (3, 5, (), ()))
+        self.assertEqual(
+            ray.get(actor.get_values.remote(2, 3)), (3, 5, (), ()))
 
         actor = Actor.remote(1, 2, "c")
-        self.assertEqual(ray.get(actor.get_values.remote(2, 3, "d")),
-                         (3, 5, ("c",), ("d",)))
+        self.assertEqual(
+            ray.get(actor.get_values.remote(2, 3, "d")), (3, 5, ("c", ),
+                                                          ("d", )))
 
         actor = Actor.remote(1, 2, "a", "b", "c", "d")
-        self.assertEqual(ray.get(actor.get_values.remote(2, 3, 1, 2, 3, 4)),
+        self.assertEqual(
+            ray.get(actor.get_values.remote(2, 3, 1, 2, 3, 4)),
             (3, 5, ("a", "b", "c", "d"), (1, 2, 3, 4)))
 
         @ray.remote
@@ -106,7 +109,7 @@ class ActorAPI(unittest.TestCase):
         a = Actor.remote()
         self.assertEqual(ray.get(a.get_values.remote()), ((), ()))
         a = Actor.remote(1)
-        self.assertEqual(ray.get(a.get_values.remote(2)), ((1,), (2,)))
+        self.assertEqual(ray.get(a.get_values.remote(2)), ((1, ), (2, )))
         a = Actor.remote(1, 2)
         self.assertEqual(ray.get(a.get_values.remote(3, 4)), ((1, 2), (3, 4)))
 
@@ -191,6 +194,7 @@ class ActorAPI(unittest.TestCase):
 
         # This is an invalid way of using the actor decorator.
         with self.assertRaises(Exception):
+
             @ray.remote()
             class Actor(object):
                 def __init__(self):
@@ -198,6 +202,7 @@ class ActorAPI(unittest.TestCase):
 
         # This is an invalid way of using the actor decorator.
         with self.assertRaises(Exception):
+
             @ray.remote(invalid_kwarg=0)  # noqa: F811
             class Actor(object):
                 def __init__(self):
@@ -205,6 +210,7 @@ class ActorAPI(unittest.TestCase):
 
         # This is an invalid way of using the actor decorator.
         with self.assertRaises(Exception):
+
             @ray.remote(num_cpus=0, invalid_kwarg=0)  # noqa: F811
             class Actor(object):
                 def __init__(self):
@@ -300,7 +306,6 @@ class ActorAPI(unittest.TestCase):
 
 
 class ActorMethods(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -417,8 +422,9 @@ class ActorMethods(unittest.TestCase):
         results = []
         # Call each actor's method a bunch of times.
         for i in range(num_actors):
-            results += [actors[i].increase.remote()
-                        for _ in range(num_increases)]
+            results += [
+                actors[i].increase.remote() for _ in range(num_increases)
+            ]
         result_values = ray.get(results)
         for i in range(num_actors):
             self.assertEqual(
@@ -440,7 +446,6 @@ class ActorMethods(unittest.TestCase):
 
 
 class ActorNesting(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -510,6 +515,7 @@ class ActorNesting(unittest.TestCase):
 
                     def get_value(self):
                         return self.x
+
                 self.actor2 = Actor2.remote(z)
 
             def get_values(self, z):
@@ -556,11 +562,13 @@ class ActorNesting(unittest.TestCase):
 
                 def get_value(self):
                     return self.x
+
             actor = Actor1.remote(x)
             return ray.get([actor.get_value.remote() for _ in range(n)])
 
         self.assertEqual(ray.get(f.remote(3, 1)), [3])
-        self.assertEqual(ray.get([f.remote(i, 20) for i in range(10)]),
+        self.assertEqual(
+            ray.get([f.remote(i, 20) for i in range(10)]),
             [20 * [i] for i in range(10)])
 
     def testUseActorWithinRemoteFunction(self):
@@ -591,6 +599,7 @@ class ActorNesting(unittest.TestCase):
         # Export a bunch of remote functions.
         num_remote_functions = 50
         for i in range(num_remote_functions):
+
             @ray.remote
             def f():
                 return i
@@ -613,7 +622,6 @@ class ActorNesting(unittest.TestCase):
 
 
 class ActorInheritance(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -646,7 +654,6 @@ class ActorInheritance(unittest.TestCase):
 
 
 class ActorSchedulingProperties(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -674,7 +681,6 @@ class ActorSchedulingProperties(unittest.TestCase):
 
 
 class ActorsOnMultipleNodes(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -692,7 +698,9 @@ class ActorsOnMultipleNodes(unittest.TestCase):
 
     def testActorLoadBalancing(self):
         num_local_schedulers = 3
-        ray.worker._init(start_ray_local=True, num_workers=0,
+        ray.worker._init(
+            start_ray_local=True,
+            num_workers=0,
             num_local_schedulers=num_local_schedulers)
 
         @ray.remote
@@ -712,13 +720,13 @@ class ActorsOnMultipleNodes(unittest.TestCase):
         attempts = 0
         while attempts < num_attempts:
             actors = [Actor1.remote() for _ in range(num_actors)]
-            locations = ray.get([actor.get_location.remote()
-                                 for actor in actors])
+            locations = ray.get(
+                [actor.get_location.remote() for actor in actors])
             names = set(locations)
             counts = [locations.count(name) for name in names]
             print("Counts are {}.".format(counts))
-            if (len(names) == num_local_schedulers and
-                    all([count >= minimum_count for count in counts])):
+            if (len(names) == num_local_schedulers
+                    and all([count >= minimum_count for count in counts])):
                 break
             attempts += 1
         self.assertLess(attempts, num_attempts)
@@ -732,18 +740,17 @@ class ActorsOnMultipleNodes(unittest.TestCase):
 
 
 class ActorsWithGPUs(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Crashing with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Crashing with new GCS API.")
     def testActorGPUs(self):
         num_local_schedulers = 3
         num_gpus_per_scheduler = 4
         ray.worker._init(
-            start_ray_local=True, num_workers=0,
+            start_ray_local=True,
+            num_workers=0,
             num_local_schedulers=num_local_schedulers,
             num_cpus=(num_local_schedulers * [10 * num_gpus_per_scheduler]),
             num_gpus=(num_local_schedulers * [num_gpus_per_scheduler]))
@@ -760,19 +767,21 @@ class ActorsWithGPUs(unittest.TestCase):
                     tuple(self.gpu_ids))
 
         # Create one actor per GPU.
-        actors = [Actor1.remote() for _
-                  in range(num_local_schedulers * num_gpus_per_scheduler)]
+        actors = [
+            Actor1.remote()
+            for _ in range(num_local_schedulers * num_gpus_per_scheduler)
+        ]
         # Make sure that no two actors are assigned to the same GPU.
-        locations_and_ids = ray.get([actor.get_location_and_ids.remote()
-                                     for actor in actors])
+        locations_and_ids = ray.get(
+            [actor.get_location_and_ids.remote() for actor in actors])
         node_names = set([location for location, gpu_id in locations_and_ids])
         self.assertEqual(len(node_names), num_local_schedulers)
         location_actor_combinations = []
         for node_name in node_names:
             for gpu_id in range(num_gpus_per_scheduler):
-                location_actor_combinations.append((node_name, (gpu_id,)))
-        self.assertEqual(set(locations_and_ids),
-                         set(location_actor_combinations))
+                location_actor_combinations.append((node_name, (gpu_id, )))
+        self.assertEqual(
+            set(locations_and_ids), set(location_actor_combinations))
 
         # Creating a new actor should fail because all of the GPUs are being
         # used.
@@ -784,7 +793,8 @@ class ActorsWithGPUs(unittest.TestCase):
         num_local_schedulers = 3
         num_gpus_per_scheduler = 5
         ray.worker._init(
-            start_ray_local=True, num_workers=0,
+            start_ray_local=True,
+            num_workers=0,
             num_local_schedulers=num_local_schedulers,
             num_cpus=(num_local_schedulers * [10 * num_gpus_per_scheduler]),
             num_gpus=(num_local_schedulers * [num_gpus_per_scheduler]))
@@ -803,8 +813,8 @@ class ActorsWithGPUs(unittest.TestCase):
         # Create some actors.
         actors1 = [Actor1.remote() for _ in range(num_local_schedulers * 2)]
         # Make sure that no two actors are assigned to the same GPU.
-        locations_and_ids = ray.get([actor.get_location_and_ids.remote()
-                                     for actor in actors1])
+        locations_and_ids = ray.get(
+            [actor.get_location_and_ids.remote() for actor in actors1])
         node_names = set([location for location, gpu_id in locations_and_ids])
         self.assertEqual(len(node_names), num_local_schedulers)
 
@@ -835,11 +845,11 @@ class ActorsWithGPUs(unittest.TestCase):
         # Create some actors.
         actors2 = [Actor2.remote() for _ in range(num_local_schedulers)]
         # Make sure that no two actors are assigned to the same GPU.
-        locations_and_ids = ray.get([actor.get_location_and_ids.remote()
-                                     for actor in actors2])
-        self.assertEqual(node_names,
-                         set([location for location, gpu_id
-                              in locations_and_ids]))
+        locations_and_ids = ray.get(
+            [actor.get_location_and_ids.remote() for actor in actors2])
+        self.assertEqual(
+            node_names,
+            set([location for location, gpu_id in locations_and_ids]))
         for location, gpu_ids in locations_and_ids:
             gpus_in_use[location].extend(gpu_ids)
         for node_name in node_names:
@@ -855,8 +865,11 @@ class ActorsWithGPUs(unittest.TestCase):
     def testActorDifferentNumbersOfGPUs(self):
         # Test that we can create actors on two nodes that have different
         # numbers of GPUs.
-        ray.worker._init(start_ray_local=True, num_workers=0,
-                         num_local_schedulers=3, num_cpus=[10, 10, 10],
+        ray.worker._init(
+            start_ray_local=True,
+            num_workers=0,
+            num_local_schedulers=3,
+            num_cpus=[10, 10, 10],
             num_gpus=[0, 5, 10])
 
         @ray.remote(num_gpus=1)
@@ -872,16 +885,19 @@ class ActorsWithGPUs(unittest.TestCase):
         # Create some actors.
         actors = [Actor1.remote() for _ in range(0 + 5 + 10)]
         # Make sure that no two actors are assigned to the same GPU.
-        locations_and_ids = ray.get([actor.get_location_and_ids.remote()
-                                    for actor in actors])
+        locations_and_ids = ray.get(
+            [actor.get_location_and_ids.remote() for actor in actors])
         node_names = set([location for location, gpu_id in locations_and_ids])
         self.assertEqual(len(node_names), 2)
         for node_name in node_names:
-            node_gpu_ids = [gpu_id for location, gpu_id in locations_and_ids
-                            if location == node_name]
+            node_gpu_ids = [
+                gpu_id for location, gpu_id in locations_and_ids
+                if location == node_name
+            ]
             self.assertIn(len(node_gpu_ids), [5, 10])
-            self.assertEqual(set(node_gpu_ids),
-                             set([(i,) for i in range(len(node_gpu_ids))]))
+            self.assertEqual(
+                set(node_gpu_ids),
+                set([(i, ) for i in range(len(node_gpu_ids))]))
 
         # Creating a new actor should fail because all of the GPUs are being
         # used.
@@ -893,8 +909,10 @@ class ActorsWithGPUs(unittest.TestCase):
         num_local_schedulers = 10
         num_gpus_per_scheduler = 10
         ray.worker._init(
-            start_ray_local=True, num_workers=0,
-            num_local_schedulers=num_local_schedulers, redirect_output=True,
+            start_ray_local=True,
+            num_workers=0,
+            num_local_schedulers=num_local_schedulers,
+            redirect_output=True,
             num_cpus=(num_local_schedulers * [10 * num_gpus_per_scheduler]),
             num_gpus=(num_local_schedulers * [num_gpus_per_scheduler]))
 
@@ -906,15 +924,17 @@ class ActorsWithGPUs(unittest.TestCase):
                     self.gpu_ids = ray.get_gpu_ids()
 
                 def get_location_and_ids(self):
-                    return ((ray.worker.global_worker.plasma_client
-                                .store_socket_name),
-                            tuple(self.gpu_ids))
+                    return ((ray.worker.global_worker.plasma_client.
+                             store_socket_name), tuple(self.gpu_ids))
+
             # Create n actors.
             for _ in range(n):
                 Actor.remote()
 
-        ray.get([create_actors.remote(num_gpus_per_scheduler)
-                 for _ in range(num_local_schedulers)])
+        ray.get([
+            create_actors.remote(num_gpus_per_scheduler)
+            for _ in range(num_local_schedulers)
+        ])
 
         @ray.remote(num_gpus=1)
         class Actor(object):
@@ -936,7 +956,8 @@ class ActorsWithGPUs(unittest.TestCase):
         num_local_schedulers = 3
         num_gpus_per_scheduler = 6
         ray.worker._init(
-            start_ray_local=True, num_workers=0,
+            start_ray_local=True,
+            num_workers=0,
             num_local_schedulers=num_local_schedulers,
             num_cpus=num_gpus_per_scheduler,
             num_gpus=(num_local_schedulers * [num_gpus_per_scheduler]))
@@ -951,11 +972,11 @@ class ActorsWithGPUs(unittest.TestCase):
                     self.assertLess(first_interval[0], first_interval[1])
                     self.assertLess(second_interval[0], second_interval[1])
                     intervals_nonoverlapping = (
-                        first_interval[1] <= second_interval[0] or
-                        second_interval[1] <= first_interval[0])
+                        first_interval[1] <= second_interval[0]
+                        or second_interval[1] <= first_interval[0])
                     assert intervals_nonoverlapping, (
-                        "Intervals {} and {} are overlapping."
-                        .format(first_interval, second_interval))
+                        "Intervals {} and {} are overlapping.".format(
+                            first_interval, second_interval))
 
         @ray.remote(num_gpus=1)
         def f1():
@@ -995,13 +1016,16 @@ class ActorsWithGPUs(unittest.TestCase):
 
         def locations_to_intervals_for_many_tasks():
             # Launch a bunch of GPU tasks.
-            locations_ids_and_intervals = ray.get(
-                [f1.remote() for _
-                 in range(5 * num_local_schedulers * num_gpus_per_scheduler)] +
-                [f2.remote() for _
-                 in range(5 * num_local_schedulers * num_gpus_per_scheduler)] +
-                [f1.remote() for _
-                 in range(5 * num_local_schedulers * num_gpus_per_scheduler)])
+            locations_ids_and_intervals = ray.get([
+                f1.remote() for _ in range(
+                    5 * num_local_schedulers * num_gpus_per_scheduler)
+            ] + [
+                f2.remote() for _ in range(
+                    5 * num_local_schedulers * num_gpus_per_scheduler)
+            ] + [
+                f1.remote() for _ in range(
+                    5 * num_local_schedulers * num_gpus_per_scheduler)
+            ])
 
             locations_to_intervals = collections.defaultdict(lambda: [])
             for location, gpu_ids, interval in locations_ids_and_intervals:
@@ -1012,7 +1036,8 @@ class ActorsWithGPUs(unittest.TestCase):
         # Run a bunch of GPU tasks.
         locations_to_intervals = locations_to_intervals_for_many_tasks()
         # Make sure that all GPUs were used.
-        self.assertEqual(len(locations_to_intervals),
+        self.assertEqual(
+            len(locations_to_intervals),
             num_local_schedulers * num_gpus_per_scheduler)
         # For each GPU, verify that the set of tasks that used this specific
         # GPU did not overlap in time.
@@ -1030,7 +1055,8 @@ class ActorsWithGPUs(unittest.TestCase):
         # Run a bunch of GPU tasks.
         locations_to_intervals = locations_to_intervals_for_many_tasks()
         # Make sure that all but one of the GPUs were used.
-        self.assertEqual(len(locations_to_intervals),
+        self.assertEqual(
+            len(locations_to_intervals),
             num_local_schedulers * num_gpus_per_scheduler - 1)
         # For each GPU, verify that the set of tasks that used this specific
         # GPU did not overlap in time.
@@ -1041,13 +1067,14 @@ class ActorsWithGPUs(unittest.TestCase):
 
         # Create several more actors that use GPUs.
         actors = [Actor1.remote() for _ in range(3)]
-        actor_locations = ray.get([actor.get_location_and_ids.remote()
-                                   for actor in actors])
+        actor_locations = ray.get(
+            [actor.get_location_and_ids.remote() for actor in actors])
 
         # Run a bunch of GPU tasks.
         locations_to_intervals = locations_to_intervals_for_many_tasks()
         # Make sure that all but 11 of the GPUs were used.
-        self.assertEqual(len(locations_to_intervals),
+        self.assertEqual(
+            len(locations_to_intervals),
             num_local_schedulers * num_gpus_per_scheduler - 1 - 3)
         # For each GPU, verify that the set of tasks that used this specific
         # GPU did not overlap in time.
@@ -1059,9 +1086,10 @@ class ActorsWithGPUs(unittest.TestCase):
             self.assertNotIn(location, locations_to_intervals)
 
         # Create more actors to fill up all the GPUs.
-        more_actors = [Actor1.remote() for _ in
-                       range(num_local_schedulers *
-                             num_gpus_per_scheduler - 1 - 3)]
+        more_actors = [
+            Actor1.remote() for _ in range(
+                num_local_schedulers * num_gpus_per_scheduler - 1 - 3)
+        ]
         # Wait for the actors to finish being created.
         ray.get([actor.get_location_and_ids.remote() for actor in more_actors])
 
@@ -1195,16 +1223,17 @@ class ActorsWithGPUs(unittest.TestCase):
 
 
 class ActorReconstruction(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testLocalSchedulerDying(self):
-        ray.worker._init(start_ray_local=True, num_local_schedulers=2,
-                         num_workers=0, redirect_output=True)
+        ray.worker._init(
+            start_ray_local=True,
+            num_local_schedulers=2,
+            num_workers=0,
+            redirect_output=True)
 
         @ray.remote
         class Counter(object):
@@ -1243,8 +1272,7 @@ class ActorReconstruction(unittest.TestCase):
         self.assertEqual(results, list(range(1, 1 + len(results))))
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testManyLocalSchedulersDying(self):
         # This test can be made more stressful by increasing the numbers below.
         # The total number of actors created will be
@@ -1253,9 +1281,11 @@ class ActorReconstruction(unittest.TestCase):
         num_actors_at_a_time = 3
         num_function_calls_at_a_time = 10
 
-        ray.worker._init(start_ray_local=True,
+        ray.worker._init(
+            start_ray_local=True,
             num_local_schedulers=num_local_schedulers,
-                         num_workers=0, redirect_output=True)
+            num_workers=0,
+            redirect_output=True)
 
         @ray.remote
         class SlowCounter(object):
@@ -1281,14 +1311,13 @@ class ActorReconstruction(unittest.TestCase):
         # a local scheduler, and run some more methods.
         for i in range(num_local_schedulers - 1):
             # Create some actors.
-            actors.extend([SlowCounter.remote()
-                           for _ in range(num_actors_at_a_time)])
+            actors.extend(
+                [SlowCounter.remote() for _ in range(num_actors_at_a_time)])
             # Run some methods.
             for j in range(len(actors)):
                 actor = actors[j]
                 for _ in range(num_function_calls_at_a_time):
-                    result_ids[actor].append(
-                        actor.inc.remote(j ** 2 * 0.000001))
+                    result_ids[actor].append(actor.inc.remote(j**2 * 0.000001))
             # Kill a plasma store to get rid of the cached objects and trigger
             # exit of the corresponding local scheduler. Don't kill the first
             # local scheduler since that is the one that the driver is
@@ -1302,18 +1331,24 @@ class ActorReconstruction(unittest.TestCase):
             for j in range(len(actors)):
                 actor = actors[j]
                 for _ in range(num_function_calls_at_a_time):
-                    result_ids[actor].append(
-                        actor.inc.remote(j ** 2 * 0.000001))
+                    result_ids[actor].append(actor.inc.remote(j**2 * 0.000001))
 
         # Get the results and check that they have the correct values.
         for _, result_id_list in result_ids.items():
-            self.assertEqual(ray.get(result_id_list),
-                             list(range(1, len(result_id_list) + 1)))
+            self.assertEqual(
+                ray.get(result_id_list), list(
+                    range(1,
+                          len(result_id_list) + 1)))
 
-    def setup_counter_actor(self, test_checkpoint=False, save_exception=False,
+    def setup_counter_actor(self,
+                            test_checkpoint=False,
+                            save_exception=False,
                             resume_exception=False):
-        ray.worker._init(start_ray_local=True, num_local_schedulers=2,
-                         num_workers=0, redirect_output=True)
+        ray.worker._init(
+            start_ray_local=True,
+            num_local_schedulers=2,
+            num_workers=0,
+            redirect_output=True)
 
         # Only set the checkpoint interval if we're testing with checkpointing.
         checkpoint_interval = -1
@@ -1371,8 +1406,7 @@ class ActorReconstruction(unittest.TestCase):
         return actor, ids
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testCheckpointing(self):
         actor, ids = self.setup_counter_actor(test_checkpoint=True)
         # Wait for the last task to finish running.
@@ -1397,8 +1431,7 @@ class ActorReconstruction(unittest.TestCase):
         self.assertLess(num_inc_calls, x)
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testRemoteCheckpoint(self):
         actor, ids = self.setup_counter_actor(test_checkpoint=True)
 
@@ -1424,8 +1457,7 @@ class ActorReconstruction(unittest.TestCase):
         self.assertEqual(x, 101)
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testLostCheckpoint(self):
         actor, ids = self.setup_counter_actor(test_checkpoint=True)
         # Wait for the first fraction of tasks to finish running.
@@ -1451,11 +1483,10 @@ class ActorReconstruction(unittest.TestCase):
         self.assertLess(5, num_inc_calls)
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testCheckpointException(self):
-        actor, ids = self.setup_counter_actor(test_checkpoint=True,
-                                              save_exception=True)
+        actor, ids = self.setup_counter_actor(
+            test_checkpoint=True, save_exception=True)
         # Wait for the last task to finish running.
         ray.get(ids[-1])
 
@@ -1481,11 +1512,10 @@ class ActorReconstruction(unittest.TestCase):
             self.assertEqual(error[b"type"], b"checkpoint")
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testCheckpointResumeException(self):
-        actor, ids = self.setup_counter_actor(test_checkpoint=True,
-                                              resume_exception=True)
+        actor, ids = self.setup_counter_actor(
+            test_checkpoint=True, resume_exception=True)
         # Wait for the last task to finish running.
         ray.get(ids[-1])
 
@@ -1527,8 +1557,9 @@ class ActorReconstruction(unittest.TestCase):
         count = ray.get(ids[-1])
         num_incs = 100
         num_iters = 10
-        forks = [fork_many_incs.remote(counter, num_incs) for _ in
-                 range(num_iters)]
+        forks = [
+            fork_many_incs.remote(counter, num_incs) for _ in range(num_iters)
+        ]
         ray.wait(forks, num_returns=len(forks))
         count += num_incs * num_iters
 
@@ -1547,8 +1578,7 @@ class ActorReconstruction(unittest.TestCase):
         self.assertEqual(x, count + 1)
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testRemoteCheckpointDistributedHandle(self):
         counter, ids = self.setup_counter_actor(test_checkpoint=True)
 
@@ -1564,8 +1594,9 @@ class ActorReconstruction(unittest.TestCase):
         count = ray.get(ids[-1])
         num_incs = 100
         num_iters = 10
-        forks = [fork_many_incs.remote(counter, num_incs) for _ in
-                 range(num_iters)]
+        forks = [
+            fork_many_incs.remote(counter, num_incs) for _ in range(num_iters)
+        ]
         ray.wait(forks, num_returns=len(forks))
         ray.wait([counter.__ray_checkpoint__.remote()])
         count += num_incs * num_iters
@@ -1605,8 +1636,9 @@ class ActorReconstruction(unittest.TestCase):
         count = ray.get(ids[-1])
         num_incs = 100
         num_iters = 10
-        forks = [fork_many_incs.remote(counter, num_incs) for _ in
-                 range(num_iters)]
+        forks = [
+            fork_many_incs.remote(counter, num_incs) for _ in range(num_iters)
+        ]
         ray.wait(forks, num_returns=len(forks))
         count += num_incs * num_iters
 
@@ -1624,11 +1656,13 @@ class ActorReconstruction(unittest.TestCase):
         x = ray.get(counter.inc.remote())
         self.assertEqual(x, count + 1)
 
-    def _testNondeterministicReconstruction(self, num_forks,
-                                            num_items_per_fork,
-                                            num_forks_to_wait):
-        ray.worker._init(start_ray_local=True, num_local_schedulers=2,
-                         num_workers=0, redirect_output=True)
+    def _testNondeterministicReconstruction(
+            self, num_forks, num_items_per_fork, num_forks_to_wait):
+        ray.worker._init(
+            start_ray_local=True,
+            num_local_schedulers=2,
+            num_workers=0,
+            redirect_output=True)
 
         # Make a shared queue.
         @ray.remote
@@ -1668,8 +1702,9 @@ class ActorReconstruction(unittest.TestCase):
         # unique objects to push onto the shared queue.
         enqueue_tasks = []
         for fork in range(num_forks):
-            enqueue_tasks.append(enqueue.remote(
-                actor, [(fork, i) for i in range(num_items_per_fork)]))
+            enqueue_tasks.append(
+                enqueue.remote(actor,
+                               [(fork, i) for i in range(num_items_per_fork)]))
         # Wait for the forks to complete their tasks.
         enqueue_tasks = ray.get(enqueue_tasks)
         enqueue_tasks = [fork_ids[0] for fork_ids in enqueue_tasks]
@@ -1689,8 +1724,8 @@ class ActorReconstruction(unittest.TestCase):
         ray.get(enqueue_tasks)
         reconstructed_queue = ray.get(actor.read.remote())
         # Make sure the final queue has all items from all forks.
-        self.assertEqual(len(reconstructed_queue), num_forks *
-                         num_items_per_fork)
+        self.assertEqual(
+            len(reconstructed_queue), num_forks * num_items_per_fork)
         # Make sure that the prefix of the final queue matches the queue from
         # the initial execution.
         self.assertEqual(queue, reconstructed_queue[:len(queue)])
@@ -1709,7 +1744,6 @@ class ActorReconstruction(unittest.TestCase):
 
 
 class DistributedActorHandles(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -1757,8 +1791,9 @@ class DistributedActorHandles(unittest.TestCase):
         # Fork num_iters times.
         num_forks = 10
         num_items_per_fork = 100
-        ray.get([fork.remote(queue, i, num_items_per_fork) for i in
-                 range(num_forks)])
+        ray.get([
+            fork.remote(queue, i, num_items_per_fork) for i in range(num_forks)
+        ])
         items = ray.get(queue.read.remote())
         for i in range(num_forks):
             filtered_items = [item[1] for item in items if item[0] == i]
@@ -1812,7 +1847,6 @@ class DistributedActorHandles(unittest.TestCase):
 
 
 class ActorPlacementAndResources(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -1836,14 +1870,20 @@ class ActorPlacementAndResources(unittest.TestCase):
 
         actor2s = [Actor2.remote() for _ in range(2)]
         results = [a.method.remote() for a in actor2s]
-        ready_ids, remaining_ids = ray.wait(results, num_returns=len(results),
-                                            timeout=1000)
+        ready_ids, remaining_ids = ray.wait(
+            results, num_returns=len(results), timeout=1000)
         self.assertEqual(len(ready_ids), 1)
 
     def testCustomLabelPlacement(self):
-        ray.worker._init(start_ray_local=True, num_local_schedulers=2,
-                         num_workers=0, resources=[{"CustomResource1": 2},
-                                                   {"CustomResource2": 2}])
+        ray.worker._init(
+            start_ray_local=True,
+            num_local_schedulers=2,
+            num_workers=0,
+            resources=[{
+                "CustomResource1": 2
+            }, {
+                "CustomResource2": 2
+            }])
 
         @ray.remote(resources={"CustomResource1": 1})
         class ResourceActor1(object):
@@ -1868,7 +1908,10 @@ class ActorPlacementAndResources(unittest.TestCase):
             self.assertNotEqual(location, local_plasma)
 
     def testCreatingMoreActorsThanResources(self):
-        ray.init(num_workers=0, num_cpus=10, num_gpus=2,
+        ray.init(
+            num_workers=0,
+            num_cpus=10,
+            num_gpus=2,
             resources={"CustomResource1": 1})
 
         @ray.remote(num_gpus=1)

test/array_test.py

@@ -20,8 +20,9 @@ class RemoteArrayTest(unittest.TestCase):
         ray.worker.cleanup()
 
     def testMethods(self):
-        for module in [ra.core, ra.random, ra.linalg, da.core, da.random,
-                       da.linalg]:
+        for module in [
+                ra.core, ra.random, ra.linalg, da.core, da.random, da.linalg
+        ]:
             reload(module)
         ray.init()
 
@@ -56,8 +57,9 @@ class DistributedArrayTest(unittest.TestCase):
         ray.worker.cleanup()
 
     def testAssemble(self):
-        for module in [ra.core, ra.random, ra.linalg, da.core, da.random,
-                       da.linalg]:
+        for module in [
+                ra.core, ra.random, ra.linalg, da.core, da.random, da.linalg
+        ]:
             reload(module)
         ray.init()
 
@@ -66,15 +68,18 @@ class DistributedArrayTest(unittest.TestCase):
         x = da.DistArray([2 * da.BLOCK_SIZE, da.BLOCK_SIZE],
                          np.array([[a], [b]]))
         assert_equal(x.assemble(),
-                     np.vstack([np.ones([da.BLOCK_SIZE, da.BLOCK_SIZE]),
-                                np.zeros([da.BLOCK_SIZE, da.BLOCK_SIZE])]))
+                     np.vstack([
+                         np.ones([da.BLOCK_SIZE, da.BLOCK_SIZE]),
+                         np.zeros([da.BLOCK_SIZE, da.BLOCK_SIZE])
+                     ]))
 
     def testMethods(self):
-        for module in [ra.core, ra.random, ra.linalg, da.core, da.random,
-                       da.linalg]:
+        for module in [
+                ra.core, ra.random, ra.linalg, da.core, da.random, da.linalg
+        ]:
             reload(module)
-        ray.worker._init(start_ray_local=True, num_local_schedulers=2,
-                         num_cpus=[10, 10])
+        ray.worker._init(
+            start_ray_local=True, num_local_schedulers=2, num_cpus=[10, 10])
 
         x = da.zeros.remote([9, 25, 51], "float")
         assert_equal(ray.get(da.assemble.remote(x)), np.zeros([9, 25, 51]))
@@ -84,20 +89,22 @@ class DistributedArrayTest(unittest.TestCase):
 
         x = da.random.normal.remote([11, 25, 49])
         y = da.copy.remote(x)
-        assert_equal(ray.get(da.assemble.remote(x)),
-                     ray.get(da.assemble.remote(y)))
+        assert_equal(
+            ray.get(da.assemble.remote(x)), ray.get(da.assemble.remote(y)))
 
         x = da.eye.remote(25, dtype_name="float")
         assert_equal(ray.get(da.assemble.remote(x)), np.eye(25))
 
         x = da.random.normal.remote([25, 49])
         y = da.triu.remote(x)
-        assert_equal(ray.get(da.assemble.remote(y)),
+        assert_equal(
+            ray.get(da.assemble.remote(y)),
             np.triu(ray.get(da.assemble.remote(x))))
 
         x = da.random.normal.remote([25, 49])
         y = da.tril.remote(x)
-        assert_equal(ray.get(da.assemble.remote(y)),
+        assert_equal(
+            ray.get(da.assemble.remote(y)),
             np.tril(ray.get(da.assemble.remote(x))))
 
         x = da.random.normal.remote([25, 49])
@@ -113,31 +120,31 @@ class DistributedArrayTest(unittest.TestCase):
         x = da.random.normal.remote([23, 42])
         y = da.random.normal.remote([23, 42])
         z = da.add.remote(x, y)
-        assert_almost_equal(ray.get(da.assemble.remote(z)),
-                            ray.get(da.assemble.remote(x)) +
-                            ray.get(da.assemble.remote(y)))
+        assert_almost_equal(
+            ray.get(da.assemble.remote(z)),
+            ray.get(da.assemble.remote(x)) + ray.get(da.assemble.remote(y)))
 
         # test subtract
         x = da.random.normal.remote([33, 40])
         y = da.random.normal.remote([33, 40])
         z = da.subtract.remote(x, y)
-        assert_almost_equal(ray.get(da.assemble.remote(z)),
-                            ray.get(da.assemble.remote(x)) -
-                            ray.get(da.assemble.remote(y)))
+        assert_almost_equal(
+            ray.get(da.assemble.remote(z)),
+            ray.get(da.assemble.remote(x)) - ray.get(da.assemble.remote(y)))
 
         # test transpose
         x = da.random.normal.remote([234, 432])
         y = da.transpose.remote(x)
-        assert_equal(ray.get(da.assemble.remote(x)).T,
-                     ray.get(da.assemble.remote(y)))
+        assert_equal(
+            ray.get(da.assemble.remote(x)).T, ray.get(da.assemble.remote(y)))
 
         # test numpy_to_dist
         x = da.random.normal.remote([23, 45])
         y = da.assemble.remote(x)
         z = da.numpy_to_dist.remote(y)
         w = da.assemble.remote(z)
-        assert_equal(ray.get(da.assemble.remote(x)),
-                     ray.get(da.assemble.remote(z)))
+        assert_equal(
+            ray.get(da.assemble.remote(x)), ray.get(da.assemble.remote(z)))
         assert_equal(ray.get(y), ray.get(w))
 
         # test da.tsqr
@@ -157,8 +164,8 @@ class DistributedArrayTest(unittest.TestCase):
 
         # test da.linalg.modified_lu
         def test_modified_lu(d1, d2):
-            print("testing dist_modified_lu with d1 = " + str(d1) +
-                  ", d2 = " + str(d2))
+            print("testing dist_modified_lu with d1 = " + str(d1) + ", d2 = " +
+                  str(d2))
             assert d1 >= d2
             m = ra.random.normal.remote([d1, d2])
             q, r = ra.linalg.qr.remote(m)
@@ -178,8 +185,8 @@ class DistributedArrayTest(unittest.TestCase):
             # Check that l is lower triangular.
             assert_equal(np.tril(l_val), l_val)
 
-        for d1, d2 in [(100, 100), (99, 98), (7, 5), (7, 7), (20, 7),
-                       (20, 10)]:
+        for d1, d2 in [(100, 100), (99, 98), (7, 5), (7, 7), (20, 7), (20,
+                                                                       10)]:
             test_modified_lu(d1, d2)
 
         # test dist_tsqr_hr

test/autoscaler_test.py

@@ -56,7 +56,8 @@ class MockProvider(NodeProvider):
             raise Exception("oops")
         return [
             n.node_id for n in self.mock_nodes.values()
-            if n.matches(tag_filters) and n.state != "terminated"]
+            if n.matches(tag_filters) and n.state != "terminated"
+        ]
 
     def is_running(self, node_id):
         return self.mock_nodes[node_id].state == "running"
@@ -101,7 +102,6 @@ SMALL_CLUSTER = {
     "docker": {
         "image": "example",
         "container_name": "mock",
-
     },
     "auth": {
         "ssh_user": "ubuntu",
@@ -269,8 +269,11 @@ class AutoscalingTest(unittest.TestCase):
         config_path = self.write_config(SMALL_CLUSTER)
         self.provider = MockProvider()
         autoscaler = StandardAutoscaler(
-            config_path, LoadMetrics(), max_concurrent_launches=5,
-            max_failures=0, update_interval_s=0)
+            config_path,
+            LoadMetrics(),
+            max_concurrent_launches=5,
+            max_failures=0,
+            update_interval_s=0)
         self.assertEqual(len(self.provider.nodes({})), 0)
         autoscaler.update()
         self.assertEqual(len(self.provider.nodes({})), 2)
@@ -295,8 +298,11 @@ class AutoscalingTest(unittest.TestCase):
         config_path = self.write_config(SMALL_CLUSTER)
         self.provider = MockProvider()
         autoscaler = StandardAutoscaler(
-            config_path, LoadMetrics(), max_concurrent_launches=5,
-            max_failures=0, update_interval_s=10)
+            config_path,
+            LoadMetrics(),
+            max_concurrent_launches=5,
+            max_failures=0,
+            update_interval_s=10)
         autoscaler.update()
         self.assertEqual(len(self.provider.nodes({})), 2)
         new_config = SMALL_CLUSTER.copy()
@@ -328,8 +334,11 @@ class AutoscalingTest(unittest.TestCase):
         config_path = self.write_config(SMALL_CLUSTER)
         self.provider = MockProvider()
         autoscaler = StandardAutoscaler(
-            config_path, LoadMetrics(), max_concurrent_launches=10,
-            max_failures=0, update_interval_s=0)
+            config_path,
+            LoadMetrics(),
+            max_concurrent_launches=10,
+            max_failures=0,
+            update_interval_s=0)
         autoscaler.update()
 
         # Write a corrupted config
@@ -383,16 +392,22 @@ class AutoscalingTest(unittest.TestCase):
         self.provider = MockProvider()
         runner = MockProcessRunner()
         autoscaler = StandardAutoscaler(
-            config_path, LoadMetrics(), max_failures=0, process_runner=runner,
-            verbose_updates=True, node_updater_cls=NodeUpdaterThread,
+            config_path,
+            LoadMetrics(),
+            max_failures=0,
+            process_runner=runner,
+            verbose_updates=True,
+            node_updater_cls=NodeUpdaterThread,
             update_interval_s=0)
         autoscaler.update()
         autoscaler.update()
         self.assertEqual(len(self.provider.nodes({})), 2)
         for node in self.provider.mock_nodes.values():
             node.state = "running"
-        assert len(self.provider.nodes(
-            {TAG_RAY_NODE_STATUS: "Uninitialized"})) == 2
+        assert len(
+            self.provider.nodes({
+                TAG_RAY_NODE_STATUS: "Uninitialized"
+            })) == 2
         autoscaler.update()
         self.waitFor(
             lambda: len(self.provider.nodes(
@@ -403,16 +418,22 @@ class AutoscalingTest(unittest.TestCase):
         self.provider = MockProvider()
         runner = MockProcessRunner(fail_cmds=["cmd1"])
         autoscaler = StandardAutoscaler(
-            config_path, LoadMetrics(), max_failures=0, process_runner=runner,
-            verbose_updates=True, node_updater_cls=NodeUpdaterThread,
+            config_path,
+            LoadMetrics(),
+            max_failures=0,
+            process_runner=runner,
+            verbose_updates=True,
+            node_updater_cls=NodeUpdaterThread,
             update_interval_s=0)
         autoscaler.update()
         autoscaler.update()
         self.assertEqual(len(self.provider.nodes({})), 2)
         for node in self.provider.mock_nodes.values():
             node.state = "running"
-        assert len(self.provider.nodes(
-            {TAG_RAY_NODE_STATUS: "Uninitialized"})) == 2
+        assert len(
+            self.provider.nodes({
+                TAG_RAY_NODE_STATUS: "Uninitialized"
+            })) == 2
         autoscaler.update()
         self.waitFor(
             lambda: len(self.provider.nodes(
@@ -423,8 +444,12 @@ class AutoscalingTest(unittest.TestCase):
         self.provider = MockProvider()
         runner = MockProcessRunner()
         autoscaler = StandardAutoscaler(
-            config_path, LoadMetrics(), max_failures=0, process_runner=runner,
-            verbose_updates=True, node_updater_cls=NodeUpdaterThread,
+            config_path,
+            LoadMetrics(),
+            max_failures=0,
+            process_runner=runner,
+            verbose_updates=True,
+            node_updater_cls=NodeUpdaterThread,
             update_interval_s=0)
         autoscaler.update()
         autoscaler.update()
@@ -490,8 +515,12 @@ class AutoscalingTest(unittest.TestCase):
         runner = MockProcessRunner()
         lm = LoadMetrics()
         autoscaler = StandardAutoscaler(
-            config_path, lm, max_failures=0, process_runner=runner,
-            verbose_updates=True, node_updater_cls=NodeUpdaterThread,
+            config_path,
+            lm,
+            max_failures=0,
+            process_runner=runner,
+            verbose_updates=True,
+            node_updater_cls=NodeUpdaterThread,
             update_interval_s=0)
         autoscaler.update()
         for node in self.provider.mock_nodes.values():

test/component_failures_test.py

@@ -11,7 +11,6 @@ import pyarrow as pa
 
 
 class ComponentFailureTest(unittest.TestCase):
-
     def tearDown(self):
         ray.worker.cleanup()
 
@@ -24,7 +23,8 @@ class ComponentFailureTest(unittest.TestCase):
         def f():
             ray.worker.global_worker.plasma_client.get(obj_id)
 
-        ray.worker._init(num_workers=1,
+        ray.worker._init(
+            num_workers=1,
             driver_mode=ray.SILENT_MODE,
             start_workers_from_local_scheduler=False,
             start_ray_local=True,
@@ -35,8 +35,8 @@ class ComponentFailureTest(unittest.TestCase):
 
         # Kill the worker.
         time.sleep(1)
-        (ray.services
-            .all_processes[ray.services.PROCESS_TYPE_WORKER][0].terminate())
+        (ray.services.all_processes[ray.services.PROCESS_TYPE_WORKER][0]
+         .terminate())
         time.sleep(0.1)
 
         # Seal the object so the store attempts to notify the worker that the
@@ -47,7 +47,8 @@ class ComponentFailureTest(unittest.TestCase):
         time.sleep(0.1)
 
         # Make sure that nothing has died.
-        self.assertTrue(ray.services.all_processes_alive(
+        self.assertTrue(
+            ray.services.all_processes_alive(
                 exclude=[ray.services.PROCESS_TYPE_WORKER]))
 
     # This test checks that when a worker dies in the middle of a wait, the
@@ -59,7 +60,8 @@ class ComponentFailureTest(unittest.TestCase):
         def f():
             ray.worker.global_worker.plasma_client.wait([obj_id])
 
-        ray.worker._init(num_workers=1,
+        ray.worker._init(
+            num_workers=1,
             driver_mode=ray.SILENT_MODE,
             start_workers_from_local_scheduler=False,
             start_ray_local=True,
@@ -70,8 +72,8 @@ class ComponentFailureTest(unittest.TestCase):
 
         # Kill the worker.
         time.sleep(1)
-        (ray.services
-            .all_processes[ray.services.PROCESS_TYPE_WORKER][0].terminate())
+        (ray.services.all_processes[ray.services.PROCESS_TYPE_WORKER][0]
+         .terminate())
         time.sleep(0.1)
 
         # Seal the object so the store attempts to notify the worker that the
@@ -82,7 +84,8 @@ class ComponentFailureTest(unittest.TestCase):
         time.sleep(0.1)
 
         # Make sure that nothing has died.
-        self.assertTrue(ray.services.all_processes_alive(
+        self.assertTrue(
+            ray.services.all_processes_alive(
                 exclude=[ray.services.PROCESS_TYPE_WORKER]))
 
     def _testWorkerFailed(self, num_local_schedulers):
@@ -92,8 +95,8 @@ class ComponentFailureTest(unittest.TestCase):
             return x
 
         num_initial_workers = 4
-        ray.worker._init(num_workers=(num_initial_workers *
-                                      num_local_schedulers),
+        ray.worker._init(
+            num_workers=(num_initial_workers * num_local_schedulers),
             num_local_schedulers=num_local_schedulers,
             start_workers_from_local_scheduler=False,
             start_ray_local=True,
@@ -101,14 +104,16 @@ class ComponentFailureTest(unittest.TestCase):
             redirect_output=True)
         # Submit more tasks than there are workers so that all workers and
         # cores are utilized.
-        object_ids = [f.remote(i) for i
-                      in range(num_initial_workers * num_local_schedulers)]
+        object_ids = [
+            f.remote(i)
+            for i in range(num_initial_workers * num_local_schedulers)
+        ]
         object_ids += [f.remote(object_id) for object_id in object_ids]
         # Allow the tasks some time to begin executing.
         time.sleep(0.1)
         # Kill the workers as the tasks execute.
-        for worker in (ray.services
-                          .all_processes[ray.services.PROCESS_TYPE_WORKER]):
+        for worker in (
+                ray.services.all_processes[ray.services.PROCESS_TYPE_WORKER]):
             worker.terminate()
             time.sleep(0.1)
         # Make sure that we can still get the objects after the executing tasks
@@ -123,6 +128,7 @@ class ComponentFailureTest(unittest.TestCase):
 
     def _testComponentFailed(self, component_type):
         """Kill a component on all worker nodes and check workload succeeds."""
+
         @ray.remote
         def f(x, j):
             time.sleep(0.2)
@@ -140,9 +146,10 @@ class ComponentFailureTest(unittest.TestCase):
 
         # Submit more tasks than there are workers so that all workers and
         # cores are utilized.
-        object_ids = [f.remote(i, 0) for i
-                      in range(num_workers_per_scheduler *
-                               num_local_schedulers)]
+        object_ids = [
+            f.remote(i, 0)
+            for i in range(num_workers_per_scheduler * num_local_schedulers)
+        ]
         object_ids += [f.remote(object_id, 1) for object_id in object_ids]
         object_ids += [f.remote(object_id, 2) for object_id in object_ids]
 
@@ -162,8 +169,8 @@ class ComponentFailureTest(unittest.TestCase):
         # Make sure that we can still get the objects after the executing tasks
         # died.
         results = ray.get(object_ids)
-        expected_results = 4 * list(range(
-            num_workers_per_scheduler * num_local_schedulers))
+        expected_results = 4 * list(
+            range(num_workers_per_scheduler * num_local_schedulers))
         self.assertEqual(results, expected_results)
 
     def check_components_alive(self, component_type, check_component_alive):
@@ -182,8 +189,7 @@ class ComponentFailureTest(unittest.TestCase):
                 self.assertTrue(not component.poll() is None)
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testLocalSchedulerFailed(self):
         # Kill all local schedulers on worker nodes.
         self._testComponentFailed(ray.services.PROCESS_TYPE_LOCAL_SCHEDULER)
@@ -198,8 +204,7 @@ class ComponentFailureTest(unittest.TestCase):
                                     False)
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testPlasmaManagerFailed(self):
         # Kill all plasma managers on worker nodes.
         self._testComponentFailed(ray.services.PROCESS_TYPE_PLASMA_MANAGER)
@@ -214,8 +219,7 @@ class ComponentFailureTest(unittest.TestCase):
                                     False)
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testPlasmaStoreFailed(self):
         # Kill all plasma stores on worker nodes.
         self._testComponentFailed(ray.services.PROCESS_TYPE_PLASMA_STORE)
@@ -235,7 +239,8 @@ class ComponentFailureTest(unittest.TestCase):
             all_processes[ray.services.PROCESS_TYPE_PLASMA_STORE][0],
             all_processes[ray.services.PROCESS_TYPE_PLASMA_MANAGER][0],
             all_processes[ray.services.PROCESS_TYPE_LOCAL_SCHEDULER][0],
-            all_processes[ray.services.PROCESS_TYPE_GLOBAL_SCHEDULER][0]]
+            all_processes[ray.services.PROCESS_TYPE_GLOBAL_SCHEDULER][0]
+        ]
 
         # Kill all the components sequentially.
         for process in processes:
@@ -253,7 +258,8 @@ class ComponentFailureTest(unittest.TestCase):
             all_processes[ray.services.PROCESS_TYPE_PLASMA_STORE][0],
             all_processes[ray.services.PROCESS_TYPE_PLASMA_MANAGER][0],
             all_processes[ray.services.PROCESS_TYPE_LOCAL_SCHEDULER][0],
-            all_processes[ray.services.PROCESS_TYPE_GLOBAL_SCHEDULER][0]]
+            all_processes[ray.services.PROCESS_TYPE_GLOBAL_SCHEDULER][0]
+        ]
 
         # Kill all the components in parallel.
         for process in processes:

test/credis_test.py

@@ -9,8 +9,7 @@ import unittest
 import ray
 
 
-@unittest.skipIf(
-    not os.environ.get('RAY_USE_NEW_GCS', False),
+@unittest.skipIf(not os.environ.get('RAY_USE_NEW_GCS', False),
                  "Tests functionality of the new GCS.")
 class CredisTest(unittest.TestCase):
     def setUp(self):
@@ -22,8 +21,8 @@ class CredisTest(unittest.TestCase):
     def test_credis_started(self):
         assert "credis_address" in self.config
         credis_address, credis_port = self.config["credis_address"].split(":")
-        credis_client = redis.StrictRedis(host=credis_address,
-                                          port=credis_port)
+        credis_client = redis.StrictRedis(
+            host=credis_address, port=credis_port)
         assert credis_client.ping() is True
 
         redis_client = ray.worker.global_state.redis_client

test/failure_test.py

@@ -108,6 +108,7 @@ def temporary_helper_function():
         def f(worker):
             if ray.worker.global_worker.mode == ray.WORKER_MODE:
                 raise Exception("Function to run failed.")
+
         ray.worker.global_worker.run_function_on_all_workers(f)
         wait_for_errors(b"function_to_run", 2)
         # Check that the error message is in the task info.
@@ -348,12 +349,14 @@ class PutErrorTest(unittest.TestCase):
         ray.worker.cleanup()
 
     def testPutError1(self):
-        store_size = 10 ** 6
-        ray.worker._init(start_ray_local=True, driver_mode=ray.SILENT_MODE,
+        store_size = 10**6
+        ray.worker._init(
+            start_ray_local=True,
+            driver_mode=ray.SILENT_MODE,
             object_store_memory=store_size)
 
         num_objects = 3
-        object_size = 4 * 10 ** 5
+        object_size = 4 * 10**5
 
         # Define a task with a single dependency, a numpy array, that returns
         # another array.
@@ -369,8 +372,9 @@ class PutErrorTest(unittest.TestCase):
             # on the one before it. The result of the first task should get
             # evicted.
             args = []
-            arg = single_dependency.remote(0, np.zeros(object_size,
-                                                       dtype=np.uint8))
+            arg = single_dependency.remote(0,
+                                           np.zeros(
+                                               object_size, dtype=np.uint8))
             for i in range(num_objects):
                 arg = single_dependency.remote(i, arg)
                 args.append(arg)
@@ -393,12 +397,14 @@ class PutErrorTest(unittest.TestCase):
 
     def testPutError2(self):
         # This is the same as the previous test, but it calls ray.put directly.
-        store_size = 10 ** 6
-        ray.worker._init(start_ray_local=True, driver_mode=ray.SILENT_MODE,
+        store_size = 10**6
+        ray.worker._init(
+            start_ray_local=True,
+            driver_mode=ray.SILENT_MODE,
             object_store_memory=store_size)
 
         num_objects = 3
-        object_size = 4 * 10 ** 5
+        object_size = 4 * 10**5
 
         # Define a task with a single dependency, a numpy array, that returns
         # another array.

test/jenkins_tests/multi_node_docker_test.py

@@ -58,6 +58,7 @@ class DockerRunner(object):
         head_container_ip: The IP address of the docker container that runs the
             head node.
     """
+
     def __init__(self):
         """Initialize the DockerRunner."""
         self.head_container_id = None
@@ -91,11 +92,14 @@ class DockerRunner(object):
         Returns:
             The IP address of the container.
         """
-        proc = subprocess.Popen(["docker", "inspect",
+        proc = subprocess.Popen(
+            [
+                "docker", "inspect",
                 "--format={{.NetworkSettings.Networks.bridge"
-                                 ".IPAddress}}",
-                                 container_id],
-                                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+                ".IPAddress}}", container_id
+            ],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
         stdout_data, _ = wait_for_output(proc)
         p = re.compile("([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})")
         m = p.match(stdout_data)
@@ -110,23 +114,23 @@ class DockerRunner(object):
         """Start the Ray head node inside a docker container."""
         mem_arg = ["--memory=" + mem_size] if mem_size else []
         shm_arg = ["--shm-size=" + shm_size] if shm_size else []
-        volume_arg = (["-v",
-                       "{}:{}".format(os.path.dirname(
-                                          os.path.realpath(__file__)),
-                                      "/ray/test/jenkins_tests")]
-                      if development_mode else [])
+        volume_arg = ([
+            "-v", "{}:{}".format(
+                os.path.dirname(os.path.realpath(__file__)),
+                "/ray/test/jenkins_tests")
+        ] if development_mode else [])
 
-        command = (["docker", "run", "-d"] + mem_arg + shm_arg + volume_arg +
-                   [docker_image, "ray", "start", "--head", "--block",
+        command = (["docker", "run", "-d"] + mem_arg + shm_arg + volume_arg + [
+            docker_image, "ray", "start", "--head", "--block",
             "--redis-port=6379",
             "--num-redis-shards={}".format(num_redis_shards),
-                    "--num-cpus={}".format(num_cpus),
-                    "--num-gpus={}".format(num_gpus),
-                    "--no-ui"])
+            "--num-cpus={}".format(num_cpus), "--num-gpus={}".format(num_gpus),
+            "--no-ui"
+        ])
         print("Starting head node with command:{}".format(command))
 
-        proc = subprocess.Popen(command,
-                                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        proc = subprocess.Popen(
+            command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         stdout_data, _ = wait_for_output(proc)
         container_id = self._get_container_id(stdout_data)
         if container_id is None:
@@ -139,29 +143,34 @@ class DockerRunner(object):
         """Start a Ray worker node inside a docker container."""
         mem_arg = ["--memory=" + mem_size] if mem_size else []
         shm_arg = ["--shm-size=" + shm_size] if shm_size else []
-        volume_arg = (["-v",
-                       "{}:{}".format(os.path.dirname(
-                                          os.path.realpath(__file__)),
-                                      "/ray/test/jenkins_tests")]
-                      if development_mode else [])
-        command = (["docker", "run", "-d"] + mem_arg + shm_arg + volume_arg +
-                   ["--shm-size=" + shm_size, docker_image,
-                    "ray", "start", "--block",
+        volume_arg = ([
+            "-v", "{}:{}".format(
+                os.path.dirname(os.path.realpath(__file__)),
+                "/ray/test/jenkins_tests")
+        ] if development_mode else [])
+        command = (["docker", "run", "-d"] + mem_arg + shm_arg + volume_arg + [
+            "--shm-size=" + shm_size, docker_image, "ray", "start", "--block",
             "--redis-address={:s}:6379".format(self.head_container_ip),
-                    "--num-cpus={}".format(num_cpus),
-                    "--num-gpus={}".format(num_gpus)])
+            "--num-cpus={}".format(num_cpus), "--num-gpus={}".format(num_gpus)
+        ])
         print("Starting worker node with command:{}".format(command))
-        proc = subprocess.Popen(command, stdout=subprocess.PIPE,
-                                stderr=subprocess.PIPE)
+        proc = subprocess.Popen(
+            command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         stdout_data, _ = wait_for_output(proc)
         container_id = self._get_container_id(stdout_data)
         if container_id is None:
             raise RuntimeError("Failed to find container id")
         self.worker_container_ids.append(container_id)
 
-    def start_ray(self, docker_image=None, mem_size=None, shm_size=None,
-                  num_nodes=None, num_redis_shards=1, num_cpus=None,
-                  num_gpus=None, development_mode=None):
+    def start_ray(self,
+                  docker_image=None,
+                  mem_size=None,
+                  shm_size=None,
+                  num_nodes=None,
+                  num_redis_shards=1,
+                  num_cpus=None,
+                  num_gpus=None,
+                  development_mode=None):
         """Start a Ray cluster within docker.
 
         This starts one docker container running the head node and
@@ -200,24 +209,31 @@ class DockerRunner(object):
 
     def _stop_node(self, container_id):
         """Stop a node in the Ray cluster."""
-        proc = subprocess.Popen(["docker", "kill", container_id],
-                                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        proc = subprocess.Popen(
+            ["docker", "kill", container_id],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
         stdout_data, _ = wait_for_output(proc)
         stopped_container_id = self._get_container_id(stdout_data)
         if not container_id == stopped_container_id:
             raise Exception("Failed to stop container {}."
                             .format(container_id))
 
-        proc = subprocess.Popen(["docker", "rm", "-f", container_id],
-                                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        proc = subprocess.Popen(
+            ["docker", "rm", "-f", container_id],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE)
         stdout_data, _ = wait_for_output(proc)
         removed_container_id = self._get_container_id(stdout_data)
         if not container_id == removed_container_id:
             raise Exception("Failed to remove container {}."
                             .format(container_id))
 
-        print("stop_node", {"container_id": container_id,
-                            "is_head": container_id == self.head_container_id})
+        print(
+            "stop_node", {
+                "container_id": container_id,
+                "is_head": container_id == self.head_container_id
+            })
 
     def stop_ray(self):
         """Stop the Ray cluster."""
@@ -236,7 +252,10 @@ class DockerRunner(object):
 
         return success
 
-    def run_test(self, test_script, num_drivers, driver_locations=None,
+    def run_test(self,
+                 test_script,
+                 num_drivers,
+                 driver_locations=None,
                  timeout_seconds=600):
         """Run a test script.
 
@@ -258,11 +277,13 @@ class DockerRunner(object):
         Raises:
             Exception: An exception is raised if the timeout expires.
         """
-        all_container_ids = ([self.head_container_id] +
-                             self.worker_container_ids)
+        all_container_ids = (
+            [self.head_container_id] + self.worker_container_ids)
         if driver_locations is None:
-            driver_locations = [np.random.randint(0, len(all_container_ids))
-                                for _ in range(num_drivers)]
+            driver_locations = [
+                np.random.randint(0, len(all_container_ids))
+                for _ in range(num_drivers)
+            ]
 
         # Define a signal handler and set an alarm to go off in
         # timeout_seconds.
@@ -278,13 +299,15 @@ class DockerRunner(object):
         for i in range(len(driver_locations)):
             # Get the container ID to run the ith driver in.
             container_id = all_container_ids[driver_locations[i]]
-            command = ["docker", "exec", container_id, "/bin/bash", "-c",
+            command = [
+                "docker", "exec", container_id, "/bin/bash", "-c",
                 ("RAY_REDIS_ADDRESS={}:6379 RAY_DRIVER_INDEX={} python "
-                        "{}".format(self.head_container_ip, i, test_script))]
+                 "{}".format(self.head_container_ip, i, test_script))
+            ]
             print("Starting driver with command {}.".format(test_script))
             # Start the driver.
-            p = subprocess.Popen(command, stdout=subprocess.PIPE,
-                                 stderr=subprocess.PIPE)
+            p = subprocess.Popen(
+                command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             driver_processes.append(p)
 
         # Wait for the drivers to finish.
@@ -295,8 +318,10 @@ class DockerRunner(object):
             print(stdout_data)
             print("STDERR:")
             print(stderr_data)
-            results.append({"success": p.returncode == 0,
-                            "return_code": p.returncode})
+            results.append({
+                "success": p.returncode == 0,
+                "return_code": p.returncode
+            })
 
         # Disable the alarm.
         signal.alarm(0)
@@ -307,28 +332,42 @@ class DockerRunner(object):
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(
         description="Run multinode tests in Docker.")
-    parser.add_argument("--docker-image", default="ray-project/deploy",
-                        help="docker image")
+    parser.add_argument(
+        "--docker-image", default="ray-project/deploy", help="docker image")
     parser.add_argument("--mem-size", help="memory size")
     parser.add_argument("--shm-size", default="1G", help="shared memory size")
-    parser.add_argument("--num-nodes", default=1, type=int,
+    parser.add_argument(
+        "--num-nodes",
+        default=1,
+        type=int,
         help="number of nodes to use in the cluster")
-    parser.add_argument("--num-redis-shards", default=1, type=int,
+    parser.add_argument(
+        "--num-redis-shards",
+        default=1,
+        type=int,
         help=("the number of Redis shards to start on the "
               "head node"))
-    parser.add_argument("--num-cpus", type=str,
+    parser.add_argument(
+        "--num-cpus",
+        type=str,
         help=("a comma separated list of values representing "
               "the number of CPUs to start each node with"))
-    parser.add_argument("--num-gpus", type=str,
+    parser.add_argument(
+        "--num-gpus",
+        type=str,
         help=("a comma separated list of values representing "
               "the number of GPUs to start each node with"))
-    parser.add_argument("--num-drivers", default=1, type=int,
-                        help="number of drivers to run")
-    parser.add_argument("--driver-locations", type=str,
+    parser.add_argument(
+        "--num-drivers", default=1, type=int, help="number of drivers to run")
+    parser.add_argument(
+        "--driver-locations",
+        type=str,
         help=("a comma separated list of indices of the "
               "containers to run the drivers in"))
     parser.add_argument("--test-script", required=True, help="test script")
-    parser.add_argument("--development-mode", action="store_true",
+    parser.add_argument(
+        "--development-mode",
+        action="store_true",
         help="use local copies of the test scripts")
     args = parser.parse_args()
 
@@ -340,17 +379,23 @@ if __name__ == "__main__":
                 if args.num_gpus is not None else num_nodes * [0])
 
     # Parse the driver locations.
-    driver_locations = (None if args.driver_locations is None
-                        else [int(i) for i
-                              in args.driver_locations.split(",")])
+    driver_locations = (None if args.driver_locations is None else
+                        [int(i) for i in args.driver_locations.split(",")])
 
     d = DockerRunner()
-    d.start_ray(docker_image=args.docker_image, mem_size=args.mem_size,
-                shm_size=args.shm_size, num_nodes=num_nodes,
-                num_redis_shards=args.num_redis_shards, num_cpus=num_cpus,
-                num_gpus=num_gpus, development_mode=args.development_mode)
+    d.start_ray(
+        docker_image=args.docker_image,
+        mem_size=args.mem_size,
+        shm_size=args.shm_size,
+        num_nodes=num_nodes,
+        num_redis_shards=args.num_redis_shards,
+        num_cpus=num_cpus,
+        num_gpus=num_gpus,
+        development_mode=args.development_mode)
     try:
-        run_results = d.run_test(args.test_script, args.num_drivers,
+        run_results = d.run_test(
+            args.test_script,
+            args.num_drivers,
             driver_locations=driver_locations)
     finally:
         successfully_stopped = d.stop_ray()

test/jenkins_tests/multi_node_tests/large_memory_test.py

@@ -6,19 +6,17 @@ import numpy as np
 
 import ray
 
-
 if __name__ == "__main__":
     ray.init(num_workers=0)
 
-    A = np.ones(2 ** 31 + 1, dtype="int8")
+    A = np.ones(2**31 + 1, dtype="int8")
     a = ray.put(A)
     assert np.sum(ray.get(a)) == np.sum(A)
     del A
     del a
     print("Successfully put A.")
 
-    B = {"hello": np.zeros(2 ** 30 + 1),
-         "world": np.ones(2 ** 30 + 1)}
+    B = {"hello": np.zeros(2**30 + 1), "world": np.ones(2**30 + 1)}
     b = ray.put(B)
     assert np.sum(ray.get(b)["hello"]) == np.sum(B["hello"])
     assert np.sum(ray.get(b)["world"]) == np.sum(B["world"])
@@ -26,7 +24,7 @@ if __name__ == "__main__":
     del b
     print("Successfully put B.")
 
-    C = [np.ones(2 ** 30 + 1), 42.0 * np.ones(2 ** 30 + 1)]
+    C = [np.ones(2**30 + 1), 42.0 * np.ones(2**30 + 1)]
     c = ray.put(C)
     assert np.sum(ray.get(c)[0]) == np.sum(C[0])
     assert np.sum(ray.get(c)[1]) == np.sum(C[1])

test/jenkins_tests/multi_node_tests/many_drivers_test.py

@@ -6,8 +6,7 @@ import os
 import time
 
 import ray
-from ray.test.test_utils import (_wait_for_nodes_to_join,
-                                 _broadcast_event,
+from ray.test.test_utils import (_wait_for_nodes_to_join, _broadcast_event,
                                  _wait_for_event)
 
 # This test should be run with 5 nodes, which have 0, 0, 5, 6, and 50 GPUs for

test/jenkins_tests/multi_node_tests/remove_driver_test.py

@@ -6,10 +6,8 @@ import os
 import time
 
 import ray
-from ray.test.test_utils import (_wait_for_nodes_to_join,
-                                 _broadcast_event,
-                                 _wait_for_event,
-                                 wait_for_pid_to_exit)
+from ray.test.test_utils import (_wait_for_nodes_to_join, _broadcast_event,
+                                 _wait_for_event, wait_for_pid_to_exit)
 
 # This test should be run with 5 nodes, which have 0, 1, 2, 3, and 4 GPUs for a
 # total of 10 GPUs. It should be run with 7 drivers. Drivers 2 through 6 must
@@ -28,7 +26,8 @@ def remote_function_event_name(driver_index, task_index):
 
 @ray.remote
 def long_running_task(driver_index, task_index, redis_address):
-    _broadcast_event(remote_function_event_name(driver_index, task_index),
+    _broadcast_event(
+        remote_function_event_name(driver_index, task_index),
         redis_address,
         data=(ray.services.get_node_ip_address(), os.getpid()))
     # Loop forever.
@@ -42,10 +41,10 @@ num_long_running_tasks_per_driver = 2
 @ray.remote
 class Actor0(object):
     def __init__(self, driver_index, actor_index, redis_address):
-        _broadcast_event(actor_event_name(driver_index, actor_index),
+        _broadcast_event(
+            actor_event_name(driver_index, actor_index),
             redis_address,
-                         data=(ray.services.get_node_ip_address(),
-                               os.getpid()))
+            data=(ray.services.get_node_ip_address(), os.getpid()))
         assert len(ray.get_gpu_ids()) == 0
 
     def check_ids(self):
@@ -60,10 +59,10 @@ class Actor0(object):
 @ray.remote(num_gpus=1)
 class Actor1(object):
     def __init__(self, driver_index, actor_index, redis_address):
-        _broadcast_event(actor_event_name(driver_index, actor_index),
+        _broadcast_event(
+            actor_event_name(driver_index, actor_index),
             redis_address,
-                         data=(ray.services.get_node_ip_address(),
-                               os.getpid()))
+            data=(ray.services.get_node_ip_address(), os.getpid()))
         assert len(ray.get_gpu_ids()) == 1
 
     def check_ids(self):
@@ -78,10 +77,10 @@ class Actor1(object):
 @ray.remote(num_gpus=2)
 class Actor2(object):
     def __init__(self, driver_index, actor_index, redis_address):
-        _broadcast_event(actor_event_name(driver_index, actor_index),
+        _broadcast_event(
+            actor_event_name(driver_index, actor_index),
             redis_address,
-                         data=(ray.services.get_node_ip_address(),
-                               os.getpid()))
+            data=(ray.services.get_node_ip_address(), os.getpid()))
         assert len(ray.get_gpu_ids()) == 2
 
     def check_ids(self):
@@ -110,11 +109,13 @@ def driver_0(redis_address, driver_index):
         long_running_task.remote(driver_index, i, redis_address)
 
     # Create some actors that require one GPU.
-    actors_one_gpu = [Actor1.remote(driver_index, i, redis_address)
-                      for i in range(5)]
+    actors_one_gpu = [
+        Actor1.remote(driver_index, i, redis_address) for i in range(5)
+    ]
     # Create some actors that don't require any GPUs.
-    actors_no_gpus = [Actor0.remote(driver_index, 5 + i, redis_address)
-                      for i in range(5)]
+    actors_no_gpus = [
+        Actor0.remote(driver_index, 5 + i, redis_address) for i in range(5)
+    ]
 
     for _ in range(1000):
         ray.get([actor.check_ids.remote() for actor in actors_one_gpu])
@@ -145,14 +146,17 @@ def driver_1(redis_address, driver_index):
         long_running_task.remote(driver_index, i, redis_address)
 
     # Create an actor that requires two GPUs.
-    actors_two_gpus = [Actor2.remote(driver_index, i, redis_address)
-                       for i in range(1)]
+    actors_two_gpus = [
+        Actor2.remote(driver_index, i, redis_address) for i in range(1)
+    ]
     # Create some actors that require one GPU.
-    actors_one_gpu = [Actor1.remote(driver_index, 1 + i, redis_address)
-                      for i in range(3)]
+    actors_one_gpu = [
+        Actor1.remote(driver_index, 1 + i, redis_address) for i in range(3)
+    ]
     # Create some actors that don't require any GPUs.
-    actors_no_gpus = [Actor0.remote(driver_index, 1 + 3 + i, redis_address)
-                      for i in range(5)]
+    actors_no_gpus = [
+        Actor0.remote(driver_index, 1 + 3 + i, redis_address) for i in range(5)
+    ]
 
     for _ in range(1000):
         ray.get([actor.check_ids.remote() for actor in actors_two_gpus])
@@ -179,8 +183,9 @@ def cleanup_driver(redis_address, driver_index):
         # We go ahead and create some actors that don't require any GPUs. We
         # don't need to wait for the other drivers to finish. We call methods
         # on these actors later to make sure they haven't been killed.
-        actors_no_gpus = [Actor0.remote(driver_index, i, redis_address)
-                          for i in range(10)]
+        actors_no_gpus = [
+            Actor0.remote(driver_index, i, redis_address) for i in range(10)
+        ]
 
     _wait_for_event("DRIVER_0_DONE", redis_address)
     _wait_for_event("DRIVER_1_DONE", redis_address)
@@ -206,13 +211,13 @@ def cleanup_driver(redis_address, driver_index):
         # Create some actors that require two GPUs.
         actors_two_gpus = []
         for i in range(3):
-            actors_two_gpus.append(try_to_create_actor(Actor2, driver_index,
-                                                       10 + i))
+            actors_two_gpus.append(
+                try_to_create_actor(Actor2, driver_index, 10 + i))
         # Create some actors that require one GPU.
         actors_one_gpu = []
         for i in range(4):
-            actors_one_gpu.append(try_to_create_actor(Actor1, driver_index,
-                                                      10 + 3 + i))
+            actors_one_gpu.append(
+                try_to_create_actor(Actor1, driver_index, 10 + 3 + i))
 
     removed_workers = 0
 
@@ -233,14 +238,14 @@ def cleanup_driver(redis_address, driver_index):
     # Make sure that the PIDs for the actors from driver 0 and driver 1 have
     # been killed.
     for i in range(10):
-        node_ip_address, pid = _wait_for_event(actor_event_name(0, i),
-                                               redis_address)
+        node_ip_address, pid = _wait_for_event(
+            actor_event_name(0, i), redis_address)
         if node_ip_address == ray.services.get_node_ip_address():
             wait_for_pid_to_exit(pid)
             removed_workers += 1
     for i in range(9):
-        node_ip_address, pid = _wait_for_event(actor_event_name(1, i),
-                                               redis_address)
+        node_ip_address, pid = _wait_for_event(
+            actor_event_name(1, i), redis_address)
         if node_ip_address == ray.services.get_node_ip_address():
             wait_for_pid_to_exit(pid)
             removed_workers += 1

test/jenkins_tests/multi_node_tests/test_0.py

@@ -25,8 +25,9 @@ if __name__ == "__main__":
     for i in range(num_attempts):
         ip_addresses = ray.get([f.remote() for i in range(1000)])
         distinct_addresses = set(ip_addresses)
-        counts = [ip_addresses.count(address) for address
-                  in distinct_addresses]
+        counts = [
+            ip_addresses.count(address) for address in distinct_addresses
+        ]
         print("Counts are {}".format(counts))
         if len(counts) == 5:
             break

test/multi_node_test.py

@@ -25,19 +25,17 @@ def run_string_as_driver(driver_script):
     with tempfile.NamedTemporaryFile() as f:
         f.write(driver_script.encode("ascii"))
         f.flush()
-        out = subprocess.check_output([sys.executable,
-                                       f.name]).decode("ascii")
+        out = subprocess.check_output([sys.executable, f.name]).decode("ascii")
     return out
 
 
 class MultiNodeTest(unittest.TestCase):
-
     def setUp(self):
         out = run_and_get_output(["ray", "start", "--head"])
         # Get the redis address from the output.
         redis_substring_prefix = "redis_address=\""
-        redis_address_location = (out.find(redis_substring_prefix) +
-                                  len(redis_substring_prefix))
+        redis_address_location = (
+            out.find(redis_substring_prefix) + len(redis_substring_prefix))
         redis_address = out[redis_address_location:]
         self.redis_address = redis_address.split("\"")[0]
 
@@ -196,7 +194,6 @@ print("success")
 
 
 class StartRayScriptTest(unittest.TestCase):
-
     def testCallingStartRayHead(self):
         # Test that we can call start-ray.sh with various command line
         # parameters. TODO(rkn): This test only tests the --head code path. We
@@ -207,69 +204,65 @@ class StartRayScriptTest(unittest.TestCase):
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with a number of workers specified.
-        run_and_get_output(["ray", "start", "--head", "--num-workers",
-                            "20"])
+        run_and_get_output(["ray", "start", "--head", "--num-workers", "20"])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with a redis port specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--redis-port", "6379"])
+        run_and_get_output(["ray", "start", "--head", "--redis-port", "6379"])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with redis shard ports specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--redis-shard-ports", "6380,6381,6382"])
+        run_and_get_output([
+            "ray", "start", "--head", "--redis-shard-ports", "6380,6381,6382"
+        ])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with a node IP address specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--node-ip-address", "127.0.0.1"])
+        run_and_get_output(
+            ["ray", "start", "--head", "--node-ip-address", "127.0.0.1"])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with an object manager port specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--object-manager-port", "12345"])
+        run_and_get_output(
+            ["ray", "start", "--head", "--object-manager-port", "12345"])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with the number of CPUs specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--num-cpus", "100"])
+        run_and_get_output(["ray", "start", "--head", "--num-cpus", "100"])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with the number of GPUs specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--num-gpus", "100"])
+        run_and_get_output(["ray", "start", "--head", "--num-gpus", "100"])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with the max redis clients specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--redis-max-clients", "100"])
+        run_and_get_output(
+            ["ray", "start", "--head", "--redis-max-clients", "100"])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with all arguments specified.
-        run_and_get_output(["ray", "start", "--head",
-                            "--num-workers", "20",
-                            "--redis-port", "6379",
-                            "--redis-shard-ports", "6380,6381,6382",
-                            "--object-manager-port", "12345",
-                            "--num-cpus", "100",
-                            "--num-gpus", "0",
-                            "--redis-max-clients", "100",
-                            "--resources", "{\"Custom\": 1}"])
+        run_and_get_output([
+            "ray", "start", "--head", "--num-workers", "20", "--redis-port",
+            "6379", "--redis-shard-ports", "6380,6381,6382",
+            "--object-manager-port", "12345", "--num-cpus", "100",
+            "--num-gpus", "0", "--redis-max-clients", "100", "--resources",
+            "{\"Custom\": 1}"
+        ])
         subprocess.Popen(["ray", "stop"]).wait()
 
         # Test starting Ray with invalid arguments.
         with self.assertRaises(Exception):
-            run_and_get_output(["ray", "start", "--head",
-                                "--redis-address", "127.0.0.1:6379"])
+            run_and_get_output([
+                "ray", "start", "--head", "--redis-address", "127.0.0.1:6379"
+            ])
         subprocess.Popen(["ray", "stop"]).wait()
 
     def testUsingHostnames(self):
         # Start the Ray processes on this machine.
-        run_and_get_output(
-            ["ray", "start", "--head",
-                             "--node-ip-address=localhost",
-                             "--redis-port=6379"])
+        run_and_get_output([
+            "ray", "start", "--head", "--node-ip-address=localhost",
+            "--redis-port=6379"
+        ])
 
         ray.init(node_ip_address="localhost", redis_address="localhost:6379")
 

test/runtest.py

@@ -184,9 +184,9 @@ DICT_OBJECTS = (
     [{
         obj: obj
     } for obj in PRIMITIVE_OBJECTS
-     if (obj.__hash__ is not None and type(obj).__module__ != "numpy")] + [{
-         0:
-         obj
+     if (obj.__hash__ is not None and type(obj).__module__ != "numpy")] +
+    [{
+        0: obj
     } for obj in BASE_OBJECTS] + [{
         Foo(123): Foo(456)
     }])
@@ -359,25 +359,29 @@ class APITest(unittest.TestCase):
         def custom_deserializer(serialized_obj):
             return serialized_obj, "string2"
 
-        ray.register_custom_serializer(Foo, serializer=custom_serializer,
+        ray.register_custom_serializer(
+            Foo,
+            serializer=custom_serializer,
             deserializer=custom_deserializer)
 
-        self.assertEqual(ray.get(ray.put(Foo())),
-                         ((3, "string1", Foo.__name__), "string2"))
+        self.assertEqual(
+            ray.get(ray.put(Foo())), ((3, "string1", Foo.__name__), "string2"))
 
         class Bar(object):
             def __init__(self):
                 self.x = 3
 
-        ray.register_custom_serializer(Bar, serializer=custom_serializer,
+        ray.register_custom_serializer(
+            Bar,
+            serializer=custom_serializer,
             deserializer=custom_deserializer)
 
         @ray.remote
         def f():
             return Bar()
 
-        self.assertEqual(ray.get(f.remote()),
-                         ((3, "string1", Bar.__name__), "string2"))
+        self.assertEqual(
+            ray.get(f.remote()), ((3, "string1", Bar.__name__), "string2"))
 
     def testRegisterClass(self):
         self.init_ray(num_workers=2)
@@ -700,10 +704,10 @@ class APITest(unittest.TestCase):
         assert ray.get(f._submit(args=[1], num_return_vals=1)) == [0]
         assert ray.get(f._submit(args=[2], num_return_vals=2)) == [0, 1]
         assert ray.get(f._submit(args=[3], num_return_vals=3)) == [0, 1, 2]
-        assert ray.get(g._submit(args=[],
-                                 num_cpus=1,
-                                 num_gpus=1,
-                                 resources={"Custom": 1})) == [0]
+        assert ray.get(
+            g._submit(
+                args=[], num_cpus=1, num_gpus=1, resources={"Custom":
+                                                            1})) == [0]
 
     def testGetMultiple(self):
         self.init_ray()
@@ -1234,8 +1238,8 @@ class ResourcesTest(unittest.TestCase):
             time.sleep(0.1)
             gpu_ids = ray.get_gpu_ids()
             assert len(gpu_ids) == 0
-            assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                    ",".join([str(i) for i in gpu_ids]))
+            assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                [str(i) for i in gpu_ids]))
             for gpu_id in gpu_ids:
                 assert gpu_id in range(num_gpus)
             return gpu_ids
@@ -1245,8 +1249,8 @@ class ResourcesTest(unittest.TestCase):
             time.sleep(0.1)
             gpu_ids = ray.get_gpu_ids()
             assert len(gpu_ids) == 1
-            assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                    ",".join([str(i) for i in gpu_ids]))
+            assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                [str(i) for i in gpu_ids]))
             for gpu_id in gpu_ids:
                 assert gpu_id in range(num_gpus)
             return gpu_ids
@@ -1256,8 +1260,8 @@ class ResourcesTest(unittest.TestCase):
             time.sleep(0.1)
             gpu_ids = ray.get_gpu_ids()
             assert len(gpu_ids) == 2
-            assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                    ",".join([str(i) for i in gpu_ids]))
+            assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                [str(i) for i in gpu_ids]))
             for gpu_id in gpu_ids:
                 assert gpu_id in range(num_gpus)
             return gpu_ids
@@ -1267,8 +1271,8 @@ class ResourcesTest(unittest.TestCase):
             time.sleep(0.1)
             gpu_ids = ray.get_gpu_ids()
             assert len(gpu_ids) == 3
-            assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                    ",".join([str(i) for i in gpu_ids]))
+            assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                [str(i) for i in gpu_ids]))
             for gpu_id in gpu_ids:
                 assert gpu_id in range(num_gpus)
             return gpu_ids
@@ -1278,8 +1282,8 @@ class ResourcesTest(unittest.TestCase):
             time.sleep(0.1)
             gpu_ids = ray.get_gpu_ids()
             assert len(gpu_ids) == 4
-            assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                    ",".join([str(i) for i in gpu_ids]))
+            assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                [str(i) for i in gpu_ids]))
             for gpu_id in gpu_ids:
                 assert gpu_id in range(num_gpus)
             return gpu_ids
@@ -1289,8 +1293,8 @@ class ResourcesTest(unittest.TestCase):
             time.sleep(0.1)
             gpu_ids = ray.get_gpu_ids()
             assert len(gpu_ids) == 5
-            assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                    ",".join([str(i) for i in gpu_ids]))
+            assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                [str(i) for i in gpu_ids]))
             for gpu_id in gpu_ids:
                 assert gpu_id in range(num_gpus)
             return gpu_ids
@@ -1342,16 +1346,16 @@ class ResourcesTest(unittest.TestCase):
             def __init__(self):
                 gpu_ids = ray.get_gpu_ids()
                 assert len(gpu_ids) == 0
-                assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                        ",".join([str(i) for i in gpu_ids]))
+                assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                    [str(i) for i in gpu_ids]))
                 # Set self.x to make sure that we got here.
                 self.x = 1
 
             def test(self):
                 gpu_ids = ray.get_gpu_ids()
                 assert len(gpu_ids) == 0
-                assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                        ",".join([str(i) for i in gpu_ids]))
+                assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                    [str(i) for i in gpu_ids]))
                 return self.x
 
         @ray.remote(num_gpus=1)
@@ -1359,16 +1363,16 @@ class ResourcesTest(unittest.TestCase):
             def __init__(self):
                 gpu_ids = ray.get_gpu_ids()
                 assert len(gpu_ids) == 1
-                assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                        ",".join([str(i) for i in gpu_ids]))
+                assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                    [str(i) for i in gpu_ids]))
                 # Set self.x to make sure that we got here.
                 self.x = 1
 
             def test(self):
                 gpu_ids = ray.get_gpu_ids()
                 assert len(gpu_ids) == 1
-                assert (os.environ["CUDA_VISIBLE_DEVICES"] ==
-                        ",".join([str(i) for i in gpu_ids]))
+                assert (os.environ["CUDA_VISIBLE_DEVICES"] == ",".join(
+                    [str(i) for i in gpu_ids]))
                 return self.x
 
         a0 = Actor0.remote()
@@ -1379,9 +1383,7 @@ class ResourcesTest(unittest.TestCase):
 
     def testZeroCPUs(self):
         ray.worker._init(
-            start_ray_local=True,
-            num_local_schedulers=2,
-            num_cpus=[0, 2])
+            start_ray_local=True, num_local_schedulers=2, num_cpus=[0, 2])
 
         local_plasma = ray.worker.global_worker.plasma_client.store_socket_name
 
@@ -1484,9 +1486,9 @@ class ResourcesTest(unittest.TestCase):
                 elif name == "run_on_2":
                     self.assertIn(result, [store_names[2]])
                 elif name == "run_on_0_1_2":
-                    self.assertIn(result, [
-                        store_names[0], store_names[1], store_names[2]
-                    ])
+                    self.assertIn(
+                        result,
+                        [store_names[0], store_names[1], store_names[2]])
                 elif name == "run_on_1_2":
                     self.assertIn(result, [store_names[1], store_names[2]])
                 elif name == "run_on_0_2":
@@ -1518,7 +1520,11 @@ class ResourcesTest(unittest.TestCase):
             start_ray_local=True,
             num_local_schedulers=2,
             num_cpus=[3, 3],
-            resources=[{"CustomResource": 0}, {"CustomResource": 1}])
+            resources=[{
+                "CustomResource": 0
+            }, {
+                "CustomResource": 1
+            }])
 
         @ray.remote
         def f():
@@ -1554,8 +1560,13 @@ class ResourcesTest(unittest.TestCase):
             start_ray_local=True,
             num_local_schedulers=2,
             num_cpus=[3, 3],
-            resources=[{"CustomResource1": 1, "CustomResource2": 2},
-                       {"CustomResource1": 3, "CustomResource2": 4}])
+            resources=[{
+                "CustomResource1": 1,
+                "CustomResource2": 2
+            }, {
+                "CustomResource1": 3,
+                "CustomResource2": 4
+            }])
 
         @ray.remote(resources={"CustomResource1": 1})
         def f():
@@ -1595,14 +1606,16 @@ class ResourcesTest(unittest.TestCase):
 
         # Make sure that tasks with unsatisfied custom resource requirements do
         # not get scheduled.
-        ready_ids, remaining_ids = ray.wait([j.remote(), k.remote()],
-                                            timeout=500)
+        ready_ids, remaining_ids = ray.wait(
+            [j.remote(), k.remote()], timeout=500)
         self.assertEqual(ready_ids, [])
 
     def testManyCustomResources(self):
         num_custom_resources = 10000
-        total_resources = {str(i): np.random.randint(1, 7)
-                           for i in range(num_custom_resources)}
+        total_resources = {
+            str(i): np.random.randint(1, 7)
+            for i in range(num_custom_resources)
+        }
         ray.init(num_cpus=5, resources=total_resources)
 
         def f():
@@ -1613,8 +1626,10 @@ class ResourcesTest(unittest.TestCase):
             num_resources = np.random.randint(0, num_custom_resources + 1)
             permuted_resources = np.random.permutation(
                 num_custom_resources)[:num_resources]
-            random_resources = {str(i): total_resources[str(i)]
-                                for i in permuted_resources}
+            random_resources = {
+                str(i): total_resources[str(i)]
+                for i in permuted_resources
+            }
             remote_function = ray.remote(resources=random_resources)(f)
             remote_functions.append(remote_function)
 
@@ -1634,8 +1649,7 @@ class CudaVisibleDevicesTest(unittest.TestCase):
     def setUp(self):
         # Record the curent value of this environment variable so that we can
         # reset it after the test.
-        self.original_gpu_ids = os.environ.get(
-            "CUDA_VISIBLE_DEVICES", None)
+        self.original_gpu_ids = os.environ.get("CUDA_VISIBLE_DEVICES", None)
 
     def tearDown(self):
         ray.worker.cleanup()
@@ -2095,9 +2109,9 @@ class GlobalStateAPI(unittest.TestCase):
             for object_info in object_table.values():
                 if len(object_info) != 5:
                     tables_ready = False
-                if (object_info["ManagerIDs"] is None or
-                        object_info["DataSize"] == -1 or
-                        object_info["Hash"] == ""):
+                if (object_info["ManagerIDs"] is None
+                        or object_info["DataSize"] == -1
+                        or object_info["Hash"] == ""):
                     tables_ready = False
 
             if len(task_table) != 10 + 1:

test/stress_tests.py

@@ -10,12 +10,13 @@ import time
 
 
 class TaskTests(unittest.TestCase):
-
     def testSubmittingTasks(self):
         for num_local_schedulers in [1, 4]:
             for num_workers_per_scheduler in [4]:
                 num_workers = num_local_schedulers * num_workers_per_scheduler
-                ray.worker._init(start_ray_local=True, num_workers=num_workers,
+                ray.worker._init(
+                    start_ray_local=True,
+                    num_workers=num_workers,
                     num_local_schedulers=num_local_schedulers,
                     num_cpus=100)
 
@@ -42,7 +43,9 @@ class TaskTests(unittest.TestCase):
         for num_local_schedulers in [1, 4]:
             for num_workers_per_scheduler in [4]:
                 num_workers = num_local_schedulers * num_workers_per_scheduler
-                ray.worker._init(start_ray_local=True, num_workers=num_workers,
+                ray.worker._init(
+                    start_ray_local=True,
+                    num_workers=num_workers,
                     num_local_schedulers=num_local_schedulers,
                     num_cpus=100)
 
@@ -89,7 +92,7 @@ class TaskTests(unittest.TestCase):
         ray.init(num_workers=1)
 
         for n in range(8):
-            x = np.zeros(10 ** n)
+            x = np.zeros(10**n)
 
             for _ in range(100):
                 ray.put(x)
@@ -108,7 +111,7 @@ class TaskTests(unittest.TestCase):
         def f():
             return 1
 
-        n = 10 ** 4  # TODO(pcm): replace by 10 ** 5 once this is faster.
+        n = 10**4  # TODO(pcm): replace by 10 ** 5 once this is faster.
         lst = ray.get([f.remote() for _ in range(n)])
         self.assertEqual(lst, n * [1])
 
@@ -119,7 +122,9 @@ class TaskTests(unittest.TestCase):
         for num_local_schedulers in [1, 4]:
             for num_workers_per_scheduler in [4]:
                 num_workers = num_local_schedulers * num_workers_per_scheduler
-                ray.worker._init(start_ray_local=True, num_workers=num_workers,
+                ray.worker._init(
+                    start_ray_local=True,
+                    num_workers=num_workers,
                     num_local_schedulers=num_local_schedulers,
                     num_cpus=100)
 
@@ -138,8 +143,10 @@ class TaskTests(unittest.TestCase):
                     time.sleep(x)
 
                 for i in range(1, 5):
-                    x_ids = [g.remote(np.random.uniform(0, i))
-                             for _ in range(2 * num_workers)]
+                    x_ids = [
+                        g.remote(np.random.uniform(0, i))
+                        for _ in range(2 * num_workers)
+                    ]
                     ray.wait(x_ids, num_returns=len(x_ids))
 
                 self.assertTrue(ray.services.all_processes_alive())
@@ -159,18 +166,20 @@ class ReconstructionTests(unittest.TestCase):
         time.sleep(0.1)
 
         # Start the Plasma store instances with a total of 1GB memory.
-        self.plasma_store_memory = 10 ** 9
+        self.plasma_store_memory = 10**9
         plasma_addresses = []
-        objstore_memory = (self.plasma_store_memory //
-                           self.num_local_schedulers)
+        objstore_memory = (
+            self.plasma_store_memory // self.num_local_schedulers)
         for i in range(self.num_local_schedulers):
             store_stdout_file, store_stderr_file = ray.services.new_log_files(
                 "plasma_store_{}".format(i), True)
             manager_stdout_file, manager_stderr_file = (
-                ray.services.new_log_files("plasma_manager_{}"
-                                           .format(i), True))
-            plasma_addresses.append(ray.services.start_objstore(
-                node_ip_address, redis_address,
+                ray.services.new_log_files("plasma_manager_{}".format(i),
+                                           True))
+            plasma_addresses.append(
+                ray.services.start_objstore(
+                    node_ip_address,
+                    redis_address,
                     objstore_memory=objstore_memory,
                     store_stdout_file=store_stdout_file,
                     store_stderr_file=store_stderr_file,
@@ -178,10 +187,14 @@ class ReconstructionTests(unittest.TestCase):
                     manager_stderr_file=manager_stderr_file))
 
         # Start the rest of the services in the Ray cluster.
-        address_info = {"redis_address": redis_address,
+        address_info = {
+            "redis_address": redis_address,
             "redis_shards": redis_shards,
-                        "object_store_addresses": plasma_addresses}
-        ray.worker._init(address_info=address_info, start_ray_local=True,
+            "object_store_addresses": plasma_addresses
+        }
+        ray.worker._init(
+            address_info=address_info,
+            start_ray_local=True,
             num_workers=1,
             num_local_schedulers=self.num_local_schedulers,
             num_cpus=[1] * self.num_local_schedulers,
@@ -197,8 +210,8 @@ class ReconstructionTests(unittest.TestCase):
         state._initialize_global_state(self.redis_ip_address, self.redis_port)
         if os.environ.get('RAY_USE_NEW_GCS', False):
             tasks = state.task_table()
-            local_scheduler_ids = set(task["LocalSchedulerID"] for task in
-                                      tasks.values())
+            local_scheduler_ids = set(
+                task["LocalSchedulerID"] for task in tasks.values())
 
         # Make sure that all nodes in the cluster were used by checking that
         # the set of local scheduler IDs that had a task scheduled or submitted
@@ -208,8 +221,8 @@ class ReconstructionTests(unittest.TestCase):
         # with the driver task, since it is not scheduled by a particular local
         # scheduler.
         if os.environ.get('RAY_USE_NEW_GCS', False):
-            self.assertEqual(len(local_scheduler_ids),
-                             self.num_local_schedulers + 1)
+            self.assertEqual(
+                len(local_scheduler_ids), self.num_local_schedulers + 1)
 
         # Clean up the Ray cluster.
         ray.worker.cleanup()
@@ -254,8 +267,7 @@ class ReconstructionTests(unittest.TestCase):
             del values
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Failing with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Failing with new GCS API.")
     def testRecursive(self):
         # Define the size of one task's return argument so that the combined
         # sum of all objects' sizes is at least twice the plasma stores'
@@ -308,8 +320,7 @@ class ReconstructionTests(unittest.TestCase):
             del values
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Failing with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Failing with new GCS API.")
     def testMultipleRecursive(self):
         # Define the size of one task's return argument so that the combined
         # sum of all objects' sizes is at least twice the plasma stores'
@@ -375,8 +386,7 @@ class ReconstructionTests(unittest.TestCase):
         return errors
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testNondeterministicTask(self):
         # Define the size of one task's return argument so that the combined
         # sum of all objects' sizes is at least twice the plasma stores'
@@ -432,14 +442,14 @@ class ReconstructionTests(unittest.TestCase):
                 # reexecuted.
                 min_errors = 1
             return len(errors) >= min_errors
+
         errors = self.wait_for_errors(error_check)
         # Make sure all the errors have the correct type.
-        self.assertTrue(all(error[b"type"] == b"object_hash_mismatch"
-                            for error in errors))
+        self.assertTrue(
+            all(error[b"type"] == b"object_hash_mismatch" for error in errors))
 
     @unittest.skipIf(
-        os.environ.get('RAY_USE_NEW_GCS', False),
-        "Hanging with new GCS API.")
+        os.environ.get('RAY_USE_NEW_GCS', False), "Hanging with new GCS API.")
     def testDriverPutErrors(self):
         # Define the size of one task's return argument so that the combined
         # sum of all objects' sizes is at least twice the plasma stores'
@@ -479,9 +489,10 @@ class ReconstructionTests(unittest.TestCase):
 
         def error_check(errors):
             return len(errors) > 1
+
         errors = self.wait_for_errors(error_check)
-        self.assertTrue(all(error[b"type"] == b"put_reconstruction"
-                            for error in errors))
+        self.assertTrue(
+            all(error[b"type"] == b"put_reconstruction" for error in errors))
 
 
 class ReconstructionTestsMultinode(ReconstructionTests):
@@ -490,6 +501,7 @@ class ReconstructionTestsMultinode(ReconstructionTests):
     # one worker each.
     num_local_schedulers = 4
 
+
 # NOTE(swang): This test tries to launch 1000 workers and breaks.
 # class WorkerPoolTests(unittest.TestCase):
 #
@@ -512,6 +524,5 @@ class ReconstructionTestsMultinode(ReconstructionTests):
 #     ray.get([g.remote(i) for i in range(1000)])
 #     ray.worker.cleanup()
 
-
 if __name__ == "__main__":
     unittest.main(verbosity=2)

test/tensorflow_test.py

@@ -23,7 +23,6 @@ def make_linear_network(w_name=None, b_name=None):
 
 
 class LossActor(object):
-
     def __init__(self, use_loss=True):
         # Uses a separate graph for each network.
         with tf.Graph().as_default():
@@ -32,10 +31,8 @@ class LossActor(object):
             loss, init, _, _ = make_linear_network()
             sess = tf.Session()
             # Additional code for setting and getting the weights.
-            weights = ray.experimental.TensorFlowVariables(loss if use_loss
-                                                           else None,
-                                                           sess,
-                                                           input_variables=var)
+            weights = ray.experimental.TensorFlowVariables(
+                loss if use_loss else None, sess, input_variables=var)
         # Return all of the data needed to use the network.
         self.values = [weights, init, sess]
         sess.run(init)
@@ -49,7 +46,6 @@ class LossActor(object):
 
 
 class NetActor(object):
-
     def __init__(self):
         # Uses a separate graph for each network.
         with tf.Graph().as_default():
@@ -71,7 +67,6 @@ class NetActor(object):
 
 
 class TrainActor(object):
-
     def __init__(self):
         # Almost the same as above, but now returns the placeholders and
         # gradient.
@@ -82,16 +77,17 @@ class TrainActor(object):
             optimizer = tf.train.GradientDescentOptimizer(0.9)
             grads = optimizer.compute_gradients(loss)
             train = optimizer.apply_gradients(grads)
-        self.values = [loss, variables, init, sess, grads, train,
-                       [x_data, y_data]]
+        self.values = [
+            loss, variables, init, sess, grads, train, [x_data, y_data]
+        ]
         sess.run(init)
 
     def training_step(self, weights):
         _, variables, _, sess, grads, _, placeholders = self.values
         variables.set_weights(weights)
-        return sess.run([grad[0] for grad in grads],
-                        feed_dict=dict(zip(placeholders,
-                                           [[1] * 100, [2] * 100])))
+        return sess.run(
+            [grad[0] for grad in grads],
+            feed_dict=dict(zip(placeholders, [[1] * 100, [2] * 100])))
 
     def get_weights(self):
         return self.values[1].get_weights()
@@ -216,8 +212,8 @@ class TensorFlowTest(unittest.TestCase):
         net2 = ray.remote(NetActor).remote()
         weights2 = ray.get(net2.get_weights.remote())
 
-        new_weights2 = ray.get(net2.set_and_get_weights.remote(
-            net2.get_weights.remote()))
+        new_weights2 = ray.get(
+            net2.set_and_get_weights.remote(net2.get_weights.remote()))
         self.assertEqual(weights2, new_weights2)
 
     def testVariablesControlDependencies(self):
@@ -247,22 +243,26 @@ class TensorFlowTest(unittest.TestCase):
         net_values = TrainActor().values
         loss, variables, _, sess, grads, train, placeholders = net_values
 
-        before_acc = sess.run(loss, feed_dict=dict(zip(placeholders,
-                                                       [[2] * 100,
-                                                        [4] * 100])))
+        before_acc = sess.run(
+            loss, feed_dict=dict(zip(placeholders, [[2] * 100, [4] * 100])))
 
         for _ in range(3):
-            gradients_list = ray.get(
-                [net.training_step.remote(variables.get_weights())
-                 for _ in range(2)])
-            mean_grads = [sum([gradients[i] for gradients in gradients_list]) /
-                          len(gradients_list) for i
-                          in range(len(gradients_list[0]))]
-            feed_dict = {grad[0]: mean_grad for (grad, mean_grad)
-                         in zip(grads, mean_grads)}
+            gradients_list = ray.get([
+                net.training_step.remote(variables.get_weights())
+                for _ in range(2)
+            ])
+            mean_grads = [
+                sum([gradients[i]
+                     for gradients in gradients_list]) / len(gradients_list)
+                for i in range(len(gradients_list[0]))
+            ]
+            feed_dict = {
+                grad[0]: mean_grad
+                for (grad, mean_grad) in zip(grads, mean_grads)
+            }
             sess.run(train, feed_dict=feed_dict)
-        after_acc = sess.run(loss, feed_dict=dict(zip(placeholders,
-                                                      [[2] * 100, [4] * 100])))
+        after_acc = sess.run(
+            loss, feed_dict=dict(zip(placeholders, [[2] * 100, [4] * 100])))
         self.assertTrue(before_acc < after_acc)
 
 

test/xray_test.py

@@ -57,12 +57,11 @@ def test_put_api(ray_start):
 
     # Test putting object IDs.
     x_id = ray.put(0)
-    for obj in [[x_id], (x_id,), {x_id: x_id}]:
+    for obj in [[x_id], (x_id, ), {x_id: x_id}]:
         assert ray.get(ray.put(obj)) == obj
 
 
 def test_actor_api(ray_start):
-
     @ray.remote
     class Foo(object):
         def __init__(self, val):