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4 changes: 2 additions & 2 deletions com.unity.ml-agents/CHANGELOG.md
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## [1.9.0-preview] - 2021-03-17
### Major Changes
#### com.unity.ml-agents (C#)
- The `BufferSensor` and `BufferSensorComponent` have been added. They allow the Agent to observe variable number of entities. (#4909)
- The `BufferSensor` and `BufferSensorComponent` have been added. They allow the Agent to observe variable number of entities. For an example, see the [Sorter environment](https://github.com/Unity-Technologies/ml-agents/blob/release_15_docs/docs/Learning-Environment-Examples.md#sorter). (#4909)
- The `SimpleMultiAgentGroup` class and `IMultiAgentGroup` interface have been added. These allow Agents to be given rewards and
end episodes in groups. (#4923)
end episodes in groups. For an example, see the [Cooperative Push Block environment](https://github.com/Unity-Technologies/ml-agents/blob/release_15_docs/docs/Learning-Environment-Examples.md#cooperative-push-block). (#4923)
#### ml-agents / ml-agents-envs / gym-unity (Python)
- The MA-POCA trainer has been added. This is a new trainer that enables Agents to learn how to work together in groups. Configure
`poca` as the trainer in the configuration YAML after instantiating a `SimpleMultiAgentGroup` to use this feature. (#5005)
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