MLU devices : Checks if mlu is available via an cndev-based check which won't trigger the drivers and leave mlu

[huismiling]

What does this PR do?

MLU devices : Checks if mlu is available via an cndev-based check which won't trigger the drivers and leave mlu

Check devices(cuda and mlu) is available with patch_environment .

Move clear_environment and patch_environment into src/accelerate/utils/environment.py to avoid circular import .

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

[huismiling]

@BenjaminBossan @muellerzr
Previous PR #3057 is closed.
Sorry for taking so long time to fix circular import.
clear_environment and patch_environment are moved into src/accelerate/utils/environment.py .

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[muellerzr]

Thanks! Makes sense that we do the realignment here of things & how they ended up.

[BenjaminBossan]

Thanks for coming back to this PR, LGTM.

Short question for @muellerzr: We should be fine with the functions no longer being importable from accelerate.utils.other because users should always import from the higher level, right?

[muellerzr]

Yep exactly. We can add a deprecation warning here but we've never advertised it in that way at that import level so I think we should be fine.

[BenjaminBossan]

Okay, great, just wanted to be sure. This PR is good to be merged from my point of view.