Release 23

[maryamziaa]

Proposed change(s)

Update ML-Agents to 23. Followed the previous release PR: https://github.com/Unity-Technologies/ml-agents/pull/6157/files

Useful links (Github issues, JIRA tickets, ML-Agents forum threads etc.)

Types of change(s)

• Bug fix
• New feature
• Code refactor
• Breaking change
• Documentation update
• Other (please describe)

Checklist

• Added tests that prove my fix is effective or that my feature works
• Updated the changelog (if applicable)
• Updated the documentation (if applicable)
• Updated the migration guide (if applicable)

Other comments

Version bump only.

[maryamziaa]

I used develop/com.unity.ml-agents/Documentation~ instead of release_23/com.unity.ml-agents/Documentation~ so that every time we have a release we don't have to update all these files. Is that OK?

[justjustinma]

Thank you for all the work on ML-Agents!

1. Do you have an estimated timeline for when release_23 might be promoted to the next main release? A few weeks ago I tried the Package Manager version on Unity 6.1 and it appeared incompatible on my end, but I might be mistaken. I just switched to using Unity 6.2 today, so I am reconsidering which version of ML-Agents to use.

2. Could you briefly clarify the practical differences between release_23 and release-4.0.0, and which you would recommend as the more future-proof choice for a long-term research project?

Thanks again!