Properly feed in None rather than empty arrays

Update changelog
Skip critic when given empty memory array
--- a/com.unity.ml-agents/CHANGELOG.md
+++ b/com.unity.ml-agents/CHANGELOG.md
 ### Bug Fixes
 #### com.unity.ml-agents (C#)
 #### ml-agents / ml-agents-envs / gym-unity (Python)
-
+- A minor bug was causing unneeded critic evaluations during inference (#4695)

 ## [1.6.0-preview] - 2020-11-18
 ### Major Changes
--- a/ml-agents/mlagents/trainers/policy/torch_policy.py
+++ b/ml-agents/mlagents/trainers/policy/torch_policy.py
        vis_obs = [
            torch.as_tensor(vis_ob) for vis_ob in vec_vis_obs.visual_observations
        ]
-        memories = torch.as_tensor(self.retrieve_memories(global_agent_ids)).unsqueeze(
-            0
+        memories = (
+            torch.as_tensor(self.retrieve_memories(global_agent_ids)).unsqueeze(0)
+            if self.use_recurrent
+            else None
        )

        run_out = {}
--- a/ml-agents/mlagents/trainers/torch/components/bc/module.py
+++ b/ml-agents/mlagents/trainers/torch/components/bc/module.py
                )
            )

-        memories = []
+        memories = None
        if self.policy.use_recurrent:
            memories = torch.zeros(1, self.n_sequences, self.policy.m_size)
作者	SHA1	备注	提交日期
Ervin Teng	4158629e	Properly feed in None rather than empty arrays	4 年前
Ervin Teng	bf9f0ad5	Update changelog	4 年前
Ervin Teng	98948c59	Skip critic when given empty memory array	4 年前