Fix import error when torch>=2.0.1 and torch.distributed is disabled

[natsukium]

What does this PR do?

Fixes #1787 again

The full log of pytest is here.
https://gist.github.com/natsukium/385b7e405f8773d007f587d899ce5373

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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@sgugger who checked my former PR. But he left huggingface and does not seem to be active anymore.
@pacman100 who introduced the code related to this FSDP.

[pacman100]

Thank you @natsukium for the fix, LGTM!

[pacman100]

cc @muellerzr for a second look before merging.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[muellerzr]

Thanks!

[natsukium]

Thanks for your review!