Migration guide - list removed APIs with replacements (#5307)

* list removed APIs with replacements

* fixes

Author: Chris Elion

com.unity.ml-agents/CHANGELOG.md

@@ -21,7 +21,7 @@ be used to set the random seed on the resulting action space. (#5303)
 #### com.unity.ml-agents / com.unity.ml-agents.extensions (C#)
 - The minimum supported Unity version was updated to 2019.4. (#5166)
 - Several breaking interface changes were made. See the
-[Migration Guide](https://github.com/Unity-Technologies/ml-agents/blob/release_14_docs/docs/Migrating.md) for more
+[Migration Guide](https://github.com/Unity-Technologies/ml-agents/blob/release_17_docs/docs/Migrating.md) for more
 details.
 - Some methods previously marked as `Obsolete` have been removed. If you were using these methods, you need to replace them with their supported counterpart.
 - The interface for disabling discrete actions in `IDiscreteActionMask` has changed.

docs/Migrating.md

@@ -1,25 +1,28 @@
 # Upgrading
 
-## :warning: Warning :warning:
-
-The C# editor code and python trainer code are not compatible between releases.
-This means that if you upgrade one, you _must_ upgrade the other as well. If you
-experience new errors or unable to connect to training after updating, please
-double-check that the versions are in the same. The versions can be found in
-
-- `Academy.k_ApiVersion` in Academy.cs
-  ([example](https://github.com/Unity-Technologies/ml-agents/blob/b255661084cb8f701c716b040693069a3fb9a257/UnitySDK/Assets/ML-Agents/Scripts/Academy.cs#L95))
-- `UnityEnvironment.API_VERSION` in environment.py
-  ([example](https://github.com/Unity-Technologies/ml-agents/blob/b255661084cb8f701c716b040693069a3fb9a257/ml-agents-envs/mlagents/envs/environment.py#L45))
-
-
 # Migrating
 ## Migrating the package to version 2.0
 - The official version of Unity ML-Agents supports is now 2019.4 LTS. If you run
   into issues, please consider deleting your project's Library folder and reponening your
   project.
 - If you used any of the APIs that were deprecated before version 2.0, you need to use their replacement. These
 deprecated APIs have been removed. See the migration steps bellow for specific API replacements.
+
+### Deprecated methods removed
+| **Deprecated API** | **Suggested Replacement** |
+|:-------:|:------:|
+| `IActuator ActuatorComponent.CreateActuator()` | `IActuator[] ActuatorComponent.CreateActuators()` |
+| `IActionReceiver.PackActions(in float[] destination)` | none |
+| `Agent.CollectDiscreteActionMasks(DiscreteActionMasker actionMasker)` | `Agent.WriteDiscreteActionMask(IDiscreteActionMask actionMask)` |
+| `Agent.Heuristic(float[] actionsOut)` | `Agent.Heuristic(in ActionBuffers actionsOut)` |
+| `Agent.OnActionReceived(float[] vectorAction)` | `Agent.OnActionReceived(ActionBuffers actions)` |
+| `Agent.GetAction()` | `Agent.GetStoredActionBuffers()` |
+| `BrainParameters.SpaceType`, `VectorActionSize`, `VectorActionSpaceType`, and `NumActions` | `BrainParameters.ActionSpec` |
+| `ObservationWriter.AddRange(IEnumerable<float> data, int writeOffset = 0)` | `ObservationWriter. AddList(IList<float> data, int writeOffset = 0` |
+| `SensorComponent.IsVisual()` and `IsVector()` | none |
+| `VectorSensor.AddObservation(IEnumerable<float> observation)` | `VectorSensor.AddObservation(IList<float> observation)` |
+| `SideChannelsManager` | `SideChannelManager` |
+
 ### IDiscreteActionMask changes
 - The interface for disabling specific discrete actions has changed. `IDiscreteActionMask.WriteMask()` was removed,
 and replaced with `SetActionEnabled()`. Instead of returning an IEnumerable with indices to disable, you can