Update prefabs

Project/Assets/ML-Agents/Examples/GridWorld/Prefabs/Area.prefab

   m_Name: 
   m_EditorClassIdentifier: 
   m_BrainParameters:
-    vectorObservationSize: 0
-    numStackedVectorObservations: 1
-    vectorActionSize: 05000000
-    vectorActionDescriptions: []
-    vectorActionSpaceType: 0
-  m_Model: {fileID: 11400000, guid: a812f1ce7763a4a0c912717f3594fe20, type: 3}
+    VectorObservationSize: 2
+    NumStackedVectorObservations: 1
+    VectorActionSize: 05000000
+    VectorActionDescriptions: []
+    VectorActionSpaceType: 0
+  m_Model: {fileID: 0}
+  m_UseChildActuators: 1
+  m_ObservableAttributeHandling: 0
 --- !u!114 &114650561397225712
 MonoBehaviour:
   m_ObjectHideFlags: 0
   agentParameters:
     maxStep: 0
   hasUpgradedFromAgentParameters: 1
-  maxStep: 100
+  MaxStep: 100
+  gridGoal: 0
 --- !u!114 &114889700908650620
 MonoBehaviour:
   m_ObjectHideFlags: 0
   m_Width: 84
   m_Height: 64
   m_Grayscale: 0
+  m_ObservationStacks: 1
   m_Compression: 1
 --- !u!114 &7980686505185502968
 MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 3a6da8f78a394c6ab027688eab81e04d, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  debugCommandLineOverride: 
 --- !u!1 &1625008366184734
 GameObject:
   m_ObjectHideFlags: 0

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

   agentParameters:
     maxStep: 100
   hasUpgradedFromAgentParameters: 1
-  maxStep: 100
+  MaxStep: 100
+  gridGoal: 0
 --- !u!65 &125487788
 BoxCollider:
   m_ObjectHideFlags: 0
   m_Name: 
   m_EditorClassIdentifier: 
   m_BrainParameters:
-    vectorObservationSize: 0
-    numStackedVectorObservations: 1
-    vectorActionSize: 05000000
-    vectorActionDescriptions: []
-    vectorActionSpaceType: 0
+    VectorObservationSize: 2
+    NumStackedVectorObservations: 1
+    VectorActionSize: 05000000
+    VectorActionDescriptions: []
+    VectorActionSpaceType: 0
   m_Model: {fileID: 11400000, guid: a812f1ce7763a4a0c912717f3594fe20, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
+  m_UseChildActuators: 1
+  m_ObservableAttributeHandling: 0
 --- !u!114 &125487791
 MonoBehaviour:
   m_ObjectHideFlags: 0
   m_RenderTexture: {fileID: 8400000, guid: 114608d5384404f89bff4b6f88432958, type: 2}
   m_SensorName: RenderTextureSensor
   m_Grayscale: 0
+  m_ObservationStacks: 1
   m_Compression: 1
 --- !u!1 &260425459
 GameObject:
         type: 3}
       propertyPath: compression
       value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 114889700908650620, guid: 5c2bd19e4bbda4991b74387ca5d28156,
+        type: 3}
+      propertyPath: m_Compression
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 114935253044749092, guid: 5c2bd19e4bbda4991b74387ca5d28156,
+        type: 3}
+      propertyPath: m_BrainParameters.VectorObservationSize
+      value: 2
+      objectReference: {fileID: 0}
+    - target: {fileID: 114935253044749092, guid: 5c2bd19e4bbda4991b74387ca5d28156,
+        type: 3}
+      propertyPath: m_Model
+      value: 
       objectReference: {fileID: 0}
     m_RemovedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: 5c2bd19e4bbda4991b74387ca5d28156, type: 3}

Project/Assets/ML-Agents/Examples/GridWorld/Scripts/GridAgent.cs

     public override void CollectObservations(VectorSensor sensor)
     {
         Array values = Enum.GetValues(typeof(GridGoal));
-        sensor.AddOneHotObservation((int)gridGoal, values.Length);
+        int goalNum = (int)gridGoal;
+        sensor.AddOneHotObservation(goalNum, values.Length);
     }
 
     public override void WriteDiscreteActionMask(IDiscreteActionMask actionMask)
         if (gridGoal == hitObject)
         {
             SetReward(1f);
-            Debug.Log(1);
-            Debug.Log(-1);
         }
     }