ray-0.6.6

Core

• Add delete_creating_tasks option for internal.free() #4588

Tune

• Add filter flag for Tune CLI. #4337
• Better handling of tune.function in global checkpoint. #4519
• Add compatibility to nevergrad 0.2.0+. #4529
• Add --columns flag for CLI. #4564
• Add checkpoint eraser. #4490
• Fix checkpointing for Gym types. #4619

RLlib

• Report sampler performance metrics. #4427
• Ensure stats are consistently reported across all algos. #4445
• Cleanup TFPolicyGraph. #4478
• Make batch timeout for remote workers tunable. #4435
• Fix inconsistent weight assignment operations in DQNPolicyGraph. #4504
• Add support for LR schedule to DQN/APEX. #4473
• Add option for RNN state and value estimates to span episodes. #4429
• Create a combination of ExternalEnv and MultiAgentEnv, called ExternalMutliAgentEnv. #4200
• Support prev_state/prev_action in rollout and fix multiagent. #4565
• Support torch device and distributions. #4553

Java

• TestNG outputs more verbose error messages. #4507
• Implement GcsClient. #4601
• Avoid unnecessary memory copy and addd a benchmark. #4611

Autoscaler

• Add support for separate docker containers on head and worker nodes. #4537
• Add an aggressive autoscaling flag. #4285