Rename async_queue_depth -> num_async (#8207)

* rename

* lint

python/ray/tests/test_iter.py

@@ -292,7 +292,7 @@ def test_gather_async(ray_start_regular_shared):
 
 def test_gather_async_queue(ray_start_regular_shared):
     it = from_range(100)
-    it = it.gather_async(async_queue_depth=4)
+    it = it.gather_async(num_async=4)
     assert sorted(it) == list(range(100))
 
 

python/ray/util/iter.py

@@ -415,14 +415,14 @@ class ParallelIterator(Generic[T]):
         name = "{}.batch_across_shards()".format(self)
         return LocalIterator(base_iterator, SharedMetrics(), name=name)
 
-    def gather_async(self, async_queue_depth=1) -> "LocalIterator[T]":
+    def gather_async(self, num_async=1) -> "LocalIterator[T]":
         """Returns a local iterable for asynchronous iteration.
 
         New items will be fetched from the shards asynchronously as soon as
         the previous one is computed. Items arrive in non-deterministic order.
 
         Arguments:
-            async_queue_depth (int): The max number of async requests in flight
+            num_async (int): The max number of async requests in flight
                 per actor. Increasing this improves the amount of pipeline
                 parallelism in the iterator.
 
@@ -436,7 +436,7 @@ class ParallelIterator(Generic[T]):
             ... 1
         """
 
-        if async_queue_depth < 1:
+        if num_async < 1:
             raise ValueError("queue depth must be positive")
 
         # Forward reference to the returned iterator.
@@ -448,7 +448,7 @@ class ParallelIterator(Generic[T]):
                 actor_set.init_actors()
                 all_actors.extend(actor_set.actors)
             futures = {}
-            for _ in range(async_queue_depth):
+            for _ in range(num_async):
                 for a in all_actors:
                     futures[a.par_iter_next.remote()] = a
             while futures:

rllib/agents/dqn/apex.py

@@ -143,7 +143,7 @@ def execution_plan(workers, config):
     # We execute the following steps concurrently:
     # (1) Generate rollouts and store them in our replay buffer actors. Update
     # the weights of the worker that generated the batch.
-    rollouts = ParallelRollouts(workers, mode="async", async_queue_depth=2)
+    rollouts = ParallelRollouts(workers, mode="async", num_async=2)
     store_op = rollouts \
         .for_each(StoreToReplayBuffer(actors=replay_actors)) \
         .zip_with_source_actor() \
@@ -154,7 +154,7 @@ def execution_plan(workers, config):
 
     # (2) Read experiences from the replay buffer actors and send to the
     # learner thread via its in-queue.
-    replay_op = Replay(actors=replay_actors, async_queue_depth=4) \
+    replay_op = Replay(actors=replay_actors, num_async=4) \
         .zip_with_source_actor() \
         .for_each(Enqueue(learner_thread.inqueue))
 

rllib/execution/replay_ops.py

@@ -52,7 +52,7 @@ class StoreToReplayBuffer:
 def Replay(*,
            local_buffer: LocalReplayBuffer = None,
            actors: List["ActorHandle"] = None,
-           async_queue_depth=4):
+           num_async=4):
     """Replay experiences from the given buffer or actors.
 
     This should be combined with the StoreToReplayActors operation using the
@@ -63,7 +63,7 @@ def Replay(*,
             and replay_actors can be specified.
         actors (list): List of replay actors. Only one of this and
             local_buffer can be specified.
-        async_queue_depth (int): In async mode, the max number of async
+        num_async (int): In async mode, the max number of async
             requests in flight per actor.
 
     Examples:
@@ -79,8 +79,8 @@ def Replay(*,
 
     if actors:
         replay = from_actors(actors)
-        return replay.gather_async(async_queue_depth=async_queue_depth).filter(
-            lambda x: x is not None)
+        return replay.gather_async(
+            num_async=num_async).filter(lambda x: x is not None)
 
     def gen_replay(_):
         while True:

rllib/execution/rollout_ops.py

@@ -17,10 +17,8 @@ from ray.rllib.utils.sgd import standardized
 logger = logging.getLogger(__name__)
 
 
-def ParallelRollouts(workers: WorkerSet,
-                     *,
-                     mode="bulk_sync",
-                     async_queue_depth=1) -> LocalIterator[SampleBatch]:
+def ParallelRollouts(workers: WorkerSet, *, mode="bulk_sync",
+                     num_async=1) -> LocalIterator[SampleBatch]:
     """Operator to collect experiences in parallel from rollout workers.
 
     If there are no remote workers, experiences will be collected serially from
@@ -36,7 +34,7 @@ def ParallelRollouts(workers: WorkerSet,
             - In 'raw' mode, the ParallelIterator object is returned directly
               and the caller is responsible for implementing gather and
               updating the timesteps counter.
-        async_queue_depth (int): In async mode, the max number of async
+        num_async (int): In async mode, the max number of async
             requests in flight per actor.
 
     Returns:
@@ -83,7 +81,7 @@ def ParallelRollouts(workers: WorkerSet,
             .for_each(report_timesteps)
     elif mode == "async":
         return rollouts.gather_async(
-            async_queue_depth=async_queue_depth).for_each(report_timesteps)
+            num_async=num_async).for_each(report_timesteps)
     elif mode == "raw":
         return rollouts
     else: