unity mlagent integration

[majid5776]

hi.
integrating unity mlagent with your project will make your project more interesting.
especially using your algorithms for AI base games.
tnx

[Xmaster6y]

Hi,
This would indeed be great, and is really wanted as shown in the todo list #94. If you have experience with Unity ML Agent, feel free to open a PR, even a draft one. This should be based on UnityMLAgentsEnv from torchrl, I think.