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Fix overlapping samples in DDP when no global seed is set #17713
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justusschock
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Borda
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> (cherry picked from commit 53815e6)
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> (cherry picked from commit 53815e6)
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Labels
bug
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data handling
Generic data-related topic
pl
Generic label for PyTorch Lightning package
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strategy: ddp
DistributedDataParallel
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What does this PR do?
This fixes an edge case when the user wants to run with
shuffle=True
, no global seed set, accelerator="ddp". On master, this situation results in overlapping data. Reported by user Turab Iqbal on Slack (thanks!).Repro:
Note:
cc @Borda @justusschock @awaelchli