Feature request: upgrade to gymnasium/update pettingzoo version

[elliottower]

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Hi, would it be possible add compatibility with Gymnasium and newer versions of PettingZoo?

Gymnasium and PettingZoo are compatible with current RL training libraries (rllib, tianshou and CleanRL have already migrated, and stable-baselines3 will soon) as well as other tools such as Comet and WandB.

For information about upgrading and compatibility, see migration guide and gym compatibility. The main difference is the API has switched to returning truncated and terminated, rather than done, in order to give more information and mitigate edge case issues.

We would like to list this package in the third party environments lists (PettingZoo, Gymnasium), but are removing all libraries which do not plan to migrate to Gymnasium/recent versions of PettingZoo.

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This package would be updated to use gymnasium rather than gym, and use at least PettingZoo v1.20 (uses termination/truncation and gymnnasium rather than gym).

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[elliottower]

Hi, just bumping this as I would love to be able to use gymnasium/pettingzoo with unity ml-agents. I would be happy to contribute any help which is needed, just wanted to see if this is on the radar and how difficult it would be.

We are cutting a new pettingzoo release shortly with some important fixes (no major breaking changes) and I was thinking after that is out it would be great to try and update this project to be compatible. Gymnasium had a new release V28 recently and I would be happy to contribute to make that compatible as well.

[miguelalonsojr]

Thanks for the request. We're planning these updates for our next release.

[elliottower]

Thanks for the request. We're planning these updates for our next release.

Great to hear, thanks! We are planning a major pettingzoo release either this coming Tuesday or the following Tuesday. The only breaking change is removing the “return_info” argument for reset(), to match gymnasium and always return an info dict. We also fixed a number of bugs, and don’t intend to do any other major releases for a while, so it would be great if ml-agents could be compatible with it.

I would be happy to help double check that things are fully compatible if you want help.

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