* enable parameter space noise for exploration
* enable parameter space noise for exploration
* yapf formatted
* remove the usage of scipy softmax avialable in the latest version only
* enable subclass that has no parameter_noise in the config
* run user specified callbacks and test parameter space noise in multi node setting
* formatted by yapf
* Update dqn.py
* lint
* Add the Delete function in GCS
* Unify BatchDelete and Delete
* Fix comment
* Lint
* Refine according to comments
* Unify test.
* Address comment
* C++ lint
* Update ray_redis_module.cc
## What do these changes do?
It saves checkpoint if needed regardless of what the scheduler have returned. Until now, it have not saved the checkpoint when scheduler returned TrialScheduler.PAUSE, which caused PopulationBasedTraining preventing to save any checkpoints in certain cases. See issue #4041 for more details.
## Related issue number
#4041
* Refine JNI bazel script to make it suitable for more systems
* Update BUILD.bazel
the script format has changed
* Update BUILD.plasma
the script format has changed
* Lint bazel/BUILD.plasma BUILD.bazel
* Use buildifier as bazel script linter
* Checkout golang version in travis
* Using golang-1.8-go in travis
* Add golang apt-repository
* Fix the bazel lint failure example.
* Address comment
* Avoid second copy of data for inlined objects
* Increase Wait timeout for valgrind tests
* Run object manager tests with and without inlined objects
* Fix test
* Implement Actor checkpointing
* docs
* fix
* fix
* fix
* move restore-from-checkpoint to HandleActorStateTransition
* Revert "move restore-from-checkpoint to HandleActorStateTransition"
This reverts commit 9aa4447c1e3e321f42a1d895d72f17098b72de12.
* resubmit waiting tasks when actor frontier restored
* add doc about num_actor_checkpoints_to_keep=1
* add num_actor_checkpoints_to_keep to Cython
* add checkpoint_expired api
* check if actor class is abstract
* change checkpoint_ids to long string
* implement java
* Refactor to delay actor creation publish until checkpoint is resumed
* debug, lint
* Erase from checkpoints to restore if task fails
* fix lint
* update comments
* avoid duplicated actor notification log
* fix unintended change
* add actor_id to checkpoint_expired
* small java updates
* make checkpoint info per actor
* lint
* Remove logging
* Remove old actor checkpointing Python code, move new checkpointing code to FunctionActionManager
* Replace old actor checkpointing tests
* Fix test and lint
* address comments
* consolidate kill_actor
* Remove __ray_checkpoint__
* fix non-ascii char
* Loosen test checks
* fix java
* fix sphinx-build