Uncomment obsolete attributes, fix warnings (#4771)

* uncomment obsolete attributes, fix warnings

* Apply suggestions from code review

Co-authored-by: andrewcoh <54679309+andrewcoh@users.noreply.github.com>

Co-authored-by: andrewcoh <54679309+andrewcoh@users.noreply.github.com>

com.unity.ml-agents/Runtime/Actuators/IActionReceiver.cs

         /// <param name="destination">A float array to pack actions into whose length is greater than or
         /// equal to the addition of the Lengths of this objects <see cref="ContinuousActions"/> and
         /// <see cref="DiscreteActions"/> segments.</param>
-        /// [Obsolete("PackActions has been deprecated.")]
+        [Obsolete("PackActions has been deprecated.")]
         public void PackActions(in float[] destination)
         {
             Debug.Assert(destination.Length >= ContinuousActions.Length + DiscreteActions.Length,

com.unity.ml-agents/Runtime/Agent.cs

         /// <seealso cref="IActionReceiver.OnActionReceived"/>
         public virtual void Heuristic(in ActionBuffers actionsOut)
         {
-            // For backward compatibility
+            // Disable deprecation warnings so we can call the legacy overload.
+#pragma warning disable CS0618
+
+            // The default implementation of Heuristic calls the
+            // obsolete version for backward compatibility
             switch (m_PolicyFactory.BrainParameters.VectorActionSpaceType)
             {
                 case SpaceType.Continuous:
                     actionsOut.ContinuousActions.Clear();
                     break;
             }
+#pragma warning restore CS0618
+
         }
 
         /// <summary>
             {
                 m_ActionMasker = new DiscreteActionMasker(actionMask);
             }
+            // Disable deprecation warnings so we can call the legacy overload.
+#pragma warning disable CS0618
+#pragma warning restore CS0618
         }
 
         /// <summary>
             {
                 m_LegacyActionCache = Array.ConvertAll(actions.DiscreteActions.Array, x => (float)x);
             }
+            // Disable deprecation warnings so we can call the legacy overload.
+#pragma warning disable CS0618
+#pragma warning restore CS0618
         }
 
         /// <summary>

com.unity.ml-agents/Runtime/Agent.deprecated.cs

         /// Deprecated, use <see cref="WriteDiscreteActionMask"/> instead.
         /// </summary>
         /// <param name="actionMasker"></param>
+        [Obsolete("CollectDiscreteActionMasks has been deprecated, please use WriteDiscreteActionMask.")]
         public virtual void CollectDiscreteActionMasks(DiscreteActionMasker actionMasker)
         {
         }
         /// </summary>
         /// <param name="actionsOut"></param>
+        [Obsolete("The float[] version of Heuristic has been deprecated, please use the ActionBuffers version instead.")]
         public virtual void Heuristic(float[] actionsOut)
         {
             Debug.LogWarning("Heuristic method called but not implemented. Returning placeholder actions.");
         /// Deprecated, use <see cref="OnActionReceived(ActionBuffers)"/> instead.
         /// </summary>
         /// <param name="vectorAction"></param>
+        [Obsolete("The float[] version of OnActionReceived has been deprecated, please use the ActionBuffers version instead.")]
         public virtual void OnActionReceived(float[] vectorAction) { }
 
         /// <summary>
         /// The last action that was decided by the Agent (or null if no decision has been made).
         /// </returns>
         /// <seealso cref="OnActionReceived(ActionBuffers)"/>
-        // [Obsolete("GetAction has been deprecated, please use GetStoredActionBuffers, Or GetStoredDiscreteActions.")]
+        [Obsolete("GetAction has been deprecated, please use GetStoredActionBuffers instead.")]
         public float[] GetAction()
         {
             var storedAction = m_Info.storedVectorActions;

com.unity.ml-agents/Runtime/Communicator/GrpcExtensions.cs

         /// <param name="isTraining">Whether or not the Brain is training.</param>
         public static BrainParametersProto ToProto(this BrainParameters bp, string name, bool isTraining)
         {
+            // Disable deprecation warnings so we can set legacy fields
+#pragma warning disable CS0618
             var brainParametersProto = new BrainParametersProto
             {
                 VectorActionSpaceTypeDeprecated = (SpaceTypeProto)bp.VectorActionSpaceType,
             {
                 brainParametersProto.VectorActionDescriptionsDeprecated.AddRange(bp.VectorActionDescriptions);
             }
+#pragma warning restore CS0618
             return brainParametersProto;
         }
 

com.unity.ml-agents/Runtime/Policies/BrainParameters.cs

         /// the action.
         /// For the discrete action space: the number of branches in the action space.
         /// </value>
-        /// [Obsolete("VectorActionSize has been deprecated, please use ActionSpec instead.")]
+        [Obsolete("VectorActionSize has been deprecated, please use ActionSpec instead.")]
         [FormerlySerializedAs("vectorActionSize")]
         public int[] VectorActionSize = new[] { 1 };
 
         /// <summary>
         /// (Deprecated) Defines if the action is discrete or continuous.
         /// </summary>
-        /// [Obsolete("VectorActionSpaceType has been deprecated, please use ActionSpec instead.")]
+        [Obsolete("VectorActionSpaceType has been deprecated, please use ActionSpec instead.")]
         [FormerlySerializedAs("vectorActionSpaceType")]
         public SpaceType VectorActionSpaceType = SpaceType.Discrete;
 
         /// <summary>
         /// (Deprecated) The number of actions specified by this Brain.
         /// </summary>
-        /// [Obsolete("NumActions has been deprecated, please use ActionSpec instead.")]
+        [Obsolete("NumActions has been deprecated, please use ActionSpec instead.")]
         public int NumActions
         {
             get
         /// <returns> A new BrainParameter object with the same values as the original.</returns>
         public BrainParameters Clone()
         {
+            // Disable deprecation warnings so we can read/write the old fields.
+#pragma warning disable CS0618
             return new BrainParameters
             {
                 VectorObservationSize = VectorObservationSize,
                 VectorActionSize = (int[])VectorActionSize.Clone(),
                 VectorActionSpaceType = VectorActionSpaceType,
             };
+#pragma warning restore CS0618
         }
 
         /// <summary>
         {
+            // Disable deprecation warnings so we can read the old fields.
+#pragma warning disable CS0618
             if (!hasUpgradedBrainParametersWithActionSpec
                 && m_ActionSpec.NumContinuousActions == 0
                 && m_ActionSpec.BranchSizes == null)
                 }
             }
             hasUpgradedBrainParametersWithActionSpec = true;
+#pragma warning restore CS0618
         }
 
         /// <summary>
         {
+            // Disable deprecation warnings so we can read the old fields.
+#pragma warning disable CS0618
+
             if (m_ActionSpec.NumContinuousActions == 0)
             {
                 VectorActionSize = (int[])ActionSpec.BranchSizes.Clone();
             {
                 VectorActionSize = null;
             }
+#pragma warning restore CS0618
         }
 
         /// <summary>

com.unity.ml-agents/Tests/Editor/MLAgentsEditModeTest.cs

             Assert.AreEqual(numSteps, agent1.sensor1.numWriteCalls);
             Assert.AreEqual(numSteps, agent1.sensor2.numCompressedCalls);
 
+            // Disable deprecation warnings so we can read/write the old fields.
+#pragma warning disable CS0618
+
+            Assert.AreEqual(
+                agent1.collectObservationsCallsForEpisode,
+                agent1.GetStoredActionBuffers().ContinuousActions[0]
+            );
+#pragma warning restore CS0618
         }
     }