Weights and Biases instead of Tensorboard (PR request)

[alexge233]

Is your feature request related to a problem? Please describe.
I'm working as part of a team that runs multiple ml-agents on our own PCs and also plan on placing them on VPS. We want to collate and compare results using wandb instead of tensorboard as this will allow us to work better as a team.

Describe the solution you'd like
I've implemented a WandbWriter in my local git clone under ml-agents/mlagents/trainers/stats.py. I've added a simple unit test in ml-agents/mlagents/trainers/tests/test_stats.py, and injected the writer in ml-agents/mlagents/plugins/stats_writer.py so it becomes available. I haven't actually tested it with the samples/examples, only locally.

Describe alternatives you've considered
I can imagine the alternative to be to package my version of mlagents and distribute it to my colleagues, but that's less than ideal. It also means I'll have to copy, merge and maintain an updated copy. I'd rather not do that.

Additional context
This repo seems to have reached its maximum forks, and therefore I could not Fork + PR. Hence opening this issue. Happy to have the changes reviews, rejected, commented on, etc. but I can't seem to do that as things stand.
Also, I may need some guidance on how exactly you expect the format for the kwargs being passed to the writer to look like.

[andrewcoh]

Hi @alexge233

This does sound interesting and we would like to see the PR. I am not totally sure what you mean by

This repo seems to have reached its maximum forks

Is it possible that is on your end i.e. your person github has reached maximum forks? If I'm not mistaken, it looks like you've successfully forked ML-Agents here.

[alexge233]

This is interesting; when I tried to fork it through github it gave me an error of max forks allowed for this repository! Ok, this is just preliminary, I've had a look at the code and made some changes. PR has been submitted let me know anything you don't like, including suggestions, coding style, documentation, etc.

[andrewcoh]

Thanks, I'll check it out soon.