4.0.3

[4.0.3] - 2026-04-17

Minor Changes

com.unity.ml-agents (C#)

• Support for Fast Enter Play Mode required by Core CLR (#6288)
• Fix deprecated instanceID API usages in com.unity.ml-agents (#6287)
• Improve documentation on how to set up local environments (#6289)

4.0.2

[4.0.2] - 2026-02-03

Minor Changes

com.unity.ml-agents (C#)

• Tests have been migrated to a companion package com.unity.ml-agents.tests to conform with the recommandations and best practices of Unity (#6280)

4.0.1

[4.0.1] - 2025-12-04

Minor Changes

com.unity.ml-agents (C#)

2.0.2

[2.0.1] - 2021-10-13

Minor Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

• Upgrade to 2.0.1
• Update gRPC native lib to universal for arm64 and x86_64. This change should enable ml-agents usage on mac M1 (#5283, #5519)

ml-agents / ml-agents-envs / gym-unity (Python)

• Set gym version in gym-unity to gym release 0.20.0(#5540)
• Harden user PII protection logic and extend TrainingAnalytics to expose detailed configuration parameters. (#5512)
• Added minimal analytics collection to LL-API (#5511)

Bug Fixes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

• Fixed the bug where curriculum learning would crash because of the incorrect run_options parsing. (#5586)

4.0.0

[4.0.0] - 2025-08-15

Major Changes

com.unity.ml-agents (C#)

3.0.0

[3.0.0] - 2024-09-02

Major Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

3.0.0-exp.1

[3.0.0-exp.1] - 2023-10-09

Major Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

2.3.0-exp.3

[2.3.0-exp.3] - 2022-11-21

Major Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

• The minimum supported Unity version was updated to 2021.3. (#)

ml-agents / ml-agents-envs

• Add your trainers to the package using Ml-Agents Custom Trainers plugin. (#)
  • ML-Agents Custom Trainers plugin is an extensible plugin system to define new trainers based on the
    High level trainer API, read more here.
• Refactored core modules to make ML-Agents internal classes more generalizable to various RL algorithms. (#)
• The minimum supported Python version for ML-agents has changed to 3.8.13. (#)
• The minimum supported version of PyTorch was changed to 1.8.0. (#)
• Add shared critic configurability for PPO. (#)
• We moved UnityToGymWrapper and PettingZoo API to ml-agents-envs package. All these environments will be
  versioned under ml-agents-envs package in the future (#)

Minor Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

• Added switch to RayPerceptionSensor to allow rays to be ordered left to right. (#26)
  • Current alternating order is still the default but will be deprecated.
• Added suppport for enabling/disabling camera object attached to camera sensor in order to improve performance. (#31)

ml-agents / ml-agents-envs

• Renaming the path that shadows torch with "mlagents/trainers/torch_entities" and update respective imports (#)

Bug Fixes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

ml-agents / ml-agents-envs

2.3.0-exp.2

[2.3.0-exp.2] - 2022-03-28

Major Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

ml-agents / ml-agents-envs

• Refactored to support the new ML-Agents Pro package.
• The minimum supported Python version for ml-agents-envs was changed to 3.7.2 (#5)
• Added support for the PettingZoo multi-agent API (#6)
• Refactored gym-unity into the ml-agents-envs package (#6)

Minor Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

• Upgrade barracuda dependency to 3.0.0 (#9)

ml-agents / ml-agents-envs

• Added the new unity_vec_env file to the ml-agents-envs module
• Extended support to python 3.9.10

Bug Fixes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

ml-agents / ml-agents-envs

2.2.1-exp.1

[2.2.1-exp.1] - 2022-01-14

Major Changes

com.unity.ml-agents / com.unity.ml-agents.extensions (C#)

• The minimum supported Unity version was updated to 2020.3. (#5673)
• Added a new feature to replicate training areas dynamically during runtime. (#5568)
• Update Barracuda to 2.3.1-preview (#5591)