fix on the instanciation of coreBrains,

fix on the conversion of actions to arrays in the BrainInfo received from step

python/unityagents/environment.py

             rewards = state_dict["rewards"]
             dones = state_dict["dones"]
             agents = state_dict["agents"]
-            actions = state_dict["actions"]
+            # actions = state_dict["actions"]
+            if n_agent > 0 :
+                actions =  np.array(state_dict["actions"]).reshape((n_agent, -1))
+            else :
+                actions = np.array([])
 
             observations = []
             for o in range(self._brains[b].number_observations):

unity-environment/Assets/ML-Agents/Scripts/Brain.cs

     External,
     Internal
 }
+
-Player,
-Heuristic,
-External,
+    Player,
+    Heuristic,
+    External,
 }
 #endif
 
 public enum StateType
 {
     discrete,
-    continuous
-}
+    continuous}
 ;
 
 /** Only need to be modified in the brain's inpector.
         {
             foreach (BrainType bt in System.Enum.GetValues(typeof(BrainType)))
             {
-                CoreBrains[(int)bt] = ScriptableObject.Instantiate(CoreBrains[(int)bt]);
+                if (CoreBrains[(int)bt] == null)
+                {
+                    CoreBrains[(int)bt] = ScriptableObject.CreateInstance("CoreBrain" + bt.ToString());
+                }
+                else
+                {
+                    CoreBrains[(int)bt] = ScriptableObject.Instantiate(CoreBrains[(int)bt]);
+                }
             }
             instanceID = gameObject.GetInstanceID();
         }