Goal conditioning grid world : Example of goal conditioning (#5193)

* Aded the Goal conditioned GridWorld to replace regular gridworld

* adding missing files

* Code improvements

* Documentation change on gridworld

* resolving conflicts

* new model

* Addressing comments

* comments and renames

* Update docs/Learning-Environment-Examples.md

Co-authored-by: Ervin T. <ervin@unity3d.com>

* adding reference to gridworld in docs about goal signal

Co-authored-by: Chris Elion <chris.elion@unity3d.com>
Co-authored-by: Ervin T. <ervin@unity3d.com>

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

 using UnityEngine;
 using System.Linq;
 using Unity.MLAgents;
+using Unity.MLAgents.Sensors;
 using Unity.MLAgents.Actuators;
 using UnityEngine.Rendering;
 using UnityEngine.Serialization;
         "RenderTexture as observations.")]
     public Camera renderCamera;
 
+    VectorSensorComponent m_GoalSensor;
+
+    public enum GridGoal
+    {
+        GreenPlus,
+        RedEx,
+    }
+
+    // Visual representations of the agent. Both are blue on top, but different colors on the bottom - this
+    // allows the user to see which corresponds to the current goal, but it's not visible to the camera.
+    // Only one is active at a time.
+    public GameObject GreenBottom;
+    public GameObject RedBottom;
+
+    GridGoal m_CurrentGoal;
+
+    public GridGoal CurrentGoal
+    {
+        get { return m_CurrentGoal; }
+        set
+        {
+            switch (value)
+            {
+                case GridGoal.GreenPlus:
+                    GreenBottom.SetActive(true);
+                    RedBottom.SetActive(false);
+                    break;
+                case GridGoal.RedEx:
+                    GreenBottom.SetActive(false);
+                    RedBottom.SetActive(true);
+                    break;
+            }
+            m_CurrentGoal = value;
+        }
+    }
+
     [Tooltip("Selecting will turn on action masking. Note that a model trained with action " +
         "masking turned on may not behave optimally when action masking is turned off.")]
     public bool maskActions = true;
 
     public override void Initialize()
     {
+        m_GoalSensor = this.GetComponent<VectorSensorComponent>();
+    }
+
+    public override void CollectObservations(VectorSensor sensor)
+    {
+        Array values = Enum.GetValues(typeof(GridGoal));
+        int goalNum = (int)CurrentGoal;
+        m_GoalSensor.GetSensor().AddOneHotObservation(goalNum, values.Length);
     }
 
     public override void WriteDiscreteActionMask(IDiscreteActionMask actionMask)
         {
             transform.position = targetPos;
 
-            if (hit.Where(col => col.gameObject.CompareTag("goal")).ToArray().Length == 1)
+            if (hit.Where(col => col.gameObject.CompareTag("plus")).ToArray().Length == 1)
-                SetReward(1f);
+                ProvideReward(GridGoal.GreenPlus);
-            else if (hit.Where(col => col.gameObject.CompareTag("pit")).ToArray().Length == 1)
+            else if (hit.Where(col => col.gameObject.CompareTag("ex")).ToArray().Length == 1)
-                SetReward(-1f);
+                ProvideReward(GridGoal.RedEx);
+        }
+    }
+
+    private void ProvideReward(GridGoal hitObject)
+    {
+        if (CurrentGoal == hitObject)
+        {
+            SetReward(1f);
+        }
+        else
+        {
+            SetReward(-1f);
         }
     }
 
     public override void OnEpisodeBegin()
     {
         area.AreaReset();
+        Array values = Enum.GetValues(typeof(GridGoal));
+        CurrentGoal = (GridGoal)values.GetValue(UnityEngine.Random.Range(0, values.Length));
     }
 
     public void FixedUpdate()

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

 using UnityEngine;
 using System.Linq;
 using Unity.MLAgents;
+using UnityEngine.Serialization;
 
 
 public class GridArea : MonoBehaviour
 
     Camera m_AgentCam;
 
-    public GameObject goalPref;
-    public GameObject pitPref;
+    [FormerlySerializedAs("PlusPref")] public GameObject GreenPlusPrefab;
+    [FormerlySerializedAs("ExPref")] public GameObject RedExPrefab;
-    public int numberOfObstacles = 1;
+    public int numberOfPlus = 1;
+    public int numberOfEx = 1;
 
     GameObject m_Plane;
     GameObject m_Sn;
     {
         m_ResetParams = Academy.Instance.EnvironmentParameters;
 
-        m_Objects = new[] { goalPref, pitPref };
+        m_Objects = new[] { GreenPlusPrefab, RedExPrefab };
 
         m_AgentCam = transform.Find("agentCam").GetComponent<Camera>();
 
         transform.position = m_InitialPosition * (m_ResetParams.GetWithDefault("gridSize", 5f) + 1);
         var playersList = new List<int>();
 
-        for (var i = 0; i < (int)m_ResetParams.GetWithDefault("numObstacles", numberOfObstacles); i++)
+        for (var i = 0; i < (int)m_ResetParams.GetWithDefault("numPlusGoals", numberOfPlus); i++)
-            playersList.Add(1);
+            playersList.Add(0);
-        for (var i = 0; i < (int)m_ResetParams.GetWithDefault("numGoals", 1f); i++)
+        for (var i = 0; i < (int)m_ResetParams.GetWithDefault("numExGoals", numberOfEx); i++)
-            playersList.Add(0);
+            playersList.Add(1);
         }
         players = playersList.ToArray();
 

Project/Assets/ML-Agents/Examples/GridWorld/TFModels.meta

 fileFormatVersion: 2
 guid: b9c5639f5544e49d785119b8a28305bd
 folderAsset: yes
-timeCreated: 1505509039
-licenseType: Pro
+  externalObjects: {}
   userData: 
   assetBundleName: 
   assetBundleVariant: 

com.unity.ml-agents/Tests/Runtime/Sensor/RenderTextureSensorTests.cs

                 }
             }
         }
+
+        [Test]
+        public void TestObservationType()
+        {
+            var width = 24;
+            var height = 16;
+            var camera = Camera.main;
+            var sensor = new CameraSensor(camera, width, height, true, "TestCameraSensor", SensorCompressionType.None);
+            var spec = sensor.GetObservationSpec();
+            Assert.AreEqual((int)spec.ObservationType, (int)ObservationType.Default);
+            sensor = new CameraSensor(camera, width, height, true, "TestCameraSensor", SensorCompressionType.None, ObservationType.Default);
+            spec = sensor.GetObservationSpec();
+            Assert.AreEqual((int)spec.ObservationType, (int)ObservationType.Default);
+            sensor = new CameraSensor(camera, width, height, true, "TestCameraSensor", SensorCompressionType.None, ObservationType.GoalSignal);
+            spec = sensor.GetObservationSpec();
+            Assert.AreEqual((int)spec.ObservationType, (int)ObservationType.GoalSignal);
+        }
     }
 }

config/ppo/GridWorld.yaml

       learning_rate_schedule: linear
     network_settings:
       normalize: false
-      hidden_units: 256
+      hidden_units: 128
       num_layers: 1
       vis_encode_type: simple
     reward_signals:

docs/Learning-Environment-Design-Agents.md

 HyperNetwork requires a lot of computations, it is recommended to use a smaller
 number of hidden units in the policy to alleviate this.
 If set to `none` the goal signal will be considered as regular observations.
+For an example on how to use a goal signal, see the
+[GridWorld example](Learning-Environment-Examples.md#gridworld).
 
 #### Goal Signal Summary & Best Practices
  - Attach a `VectorSensorComponent` or `CameraSensorComponent` to an agent and

docs/Learning-Environment-Examples.md

 
 ![GridWorld](images/gridworld.png)
 
-- Set-up: A version of the classic grid-world task. Scene contains agent, goal,
+- Set-up: A multi-goal version of the grid-world task. Scene contains agent, goal,
-- Goal: The agent must navigate the grid to the goal while avoiding the
-  obstacles.
+- Goal: The agent must navigate the grid to the appropriate goal while
+  avoiding the obstacles.
-  - +1.0 if the agent navigates to the goal position of the grid (episode ends).
-  - -1.0 if the agent navigates to an obstacle (episode ends).
+  - +1.0 if the agent navigates to the correct goal (episode ends).
+  - -1.0 if the agent navigates to an incorrect goal (episode ends).
 - Behavior Parameters:
   - Vector Observation space: None
   - Actions: 1 discrete action branch with 5 actions, corresponding to movement in
     checkbox within the `trueAgent` GameObject). The trained model file provided
     was generated with action masking turned on.
   - Visual Observations: One corresponding to top-down view of GridWorld.
-- Float Properties: Three, corresponding to grid size, number of obstacles, and
-  number of goals.
+  - Goal Signal : A one hot vector corresponding to which color is the correct goal
+  for the Agent
+- Float Properties: Three, corresponding to grid size, number of green goals, and
+  number of red goals.
 - Benchmark Mean Reward: 0.8
 
 ## Push Block

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