fixed broken prefab...

Project/Assets/ML-Agents/Examples/Tennis/Prefabs/TennisArea.prefab

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   m_BrainParameters:
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     vectorActionSize: 03000000
     vectorActionDescriptions: []
     vectorActionSpaceType: 1
   m_EditorClassIdentifier: 
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     vectorActionDescriptions: []
     vectorActionSpaceType: 1

Project/Assets/ML-Agents/Examples/Tennis/Scenes/Tennis.unity

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---- !u!1001 &1065879750
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 --- !u!1001 &1093755623
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       objectReference: {fileID: 0}
     m_RemovedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: 3ce107b4a79bc4eef83afde434932a68, type: 3}
+--- !u!1001 &2064309702
+PrefabInstance:
+  m_ObjectHideFlags: 0
+  serializedVersion: 2
+  m_Modification:
+    m_TransformParent: {fileID: 0}
+    m_Modifications:
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+      propertyPath: m_Name
+      value: TennisArea (1)
+      objectReference: {fileID: 0}
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+      value: 0
+      objectReference: {fileID: 0}
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+      objectReference: {fileID: 0}
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+      value: 0
+      objectReference: {fileID: 0}
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+      value: 0
+      objectReference: {fileID: 0}
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+      value: 1
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+      objectReference: {fileID: 0}
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+      propertyPath: m_LocalEulerAnglesHint.x
+      value: 0
+      objectReference: {fileID: 0}
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+    m_RemovedComponents: []
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 --- !u!1 &2073469450
 GameObject:
   m_ObjectHideFlags: 0

config/trainer_config.yaml

     learning_rate_schedule: constant
     batch_size: 2048
     buffer_size: 20480
-    hidden_units: 512
+    hidden_units: 256
-    beta: 1.0e-2
     self_play:
         window: 10
         play_against_latest_model_ratio: 0.5