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Avoid passing process group to enable FSDP's hybrid-shard #18583

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merged 10 commits into from
Sep 19, 2023

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awaelchli
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@awaelchli awaelchli commented Sep 19, 2023

What does this PR do?

Alternative approach to #18562.
Fixes #18552

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📚 Documentation preview 📚: https://pytorch-lightning--18583.org.readthedocs.build/en/18583/

cc @Borda @carmocca @justusschock @awaelchli

@github-actions github-actions bot added fabric lightning.fabric.Fabric pl Generic label for PyTorch Lightning package labels Sep 19, 2023
@awaelchli awaelchli added feature Is an improvement or enhancement strategy: fsdp Fully Sharded Data Parallel labels Sep 19, 2023
@awaelchli awaelchli added this to the 2.1 milestone Sep 19, 2023
@awaelchli awaelchli marked this pull request as ready for review September 19, 2023 00:49
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Thank you for your contribution! 💜

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LGTM

src/lightning/fabric/CHANGELOG.md Outdated Show resolved Hide resolved
@@ -203,12 +202,9 @@ def num_processes(self) -> int:

@property
def process_group(self) -> Optional[ProcessGroup]:
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I would suggest removing this property, since we don't use it and it'll be a problem if we ever finish the collectives refactor

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It's easy to avoid the breaking change here the way I did, and so I would like to avoid it unless absolutely necessary. If we need to remove it in the future, we can always do it with the justification needed at that time.

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If you still think the property should be removed, could you make the PR for it?

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Done: #18592

@mergify mergify bot added the ready PRs ready to be merged label Sep 19, 2023
@awaelchli awaelchli merged commit 8094855 into master Sep 19, 2023
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@awaelchli awaelchli deleted the fabric/hybrid-shard-2 branch September 19, 2023 17:46
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