[BUG] `check_env_specs` shouldn't set `torch.manual_seed` by default.

[maximilianigl]

Describe the bug

Current default behaviour of check_env_specs() is to set the manual key to 0.
I think this is dangerous as people might run this function after setting their own seed (at the beginning of main(), not realizing it's overwriting what they set before.

Reason and Possible fixes

Set default argument of seed in check_env_specs to None.

Checklist

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[vmoens]

Yep I agree it isn't ideal.

Note that the intended use of this function is to be run out of your training loop.

I wish PyTorch had some more refined way of locally set the seed but as of now it isn't the case.

I can have a look at not seeding things by default

[vmoens]

If you want to have a look at #1872 it should be ready

[maximilianigl]

Looks great, thank you!