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[Fix] Fix conflict of downloading dataset #3066

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@LamForest LamForest commented Sep 29, 2024

Fixes #3065. Only download dataset on rank 0. Use dist.barrier() to sync.

cc @wconstab @osalpekar @H-Huang @kwen2501

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pytorch-bot bot commented Sep 29, 2024

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3066

Note: Links to docs will display an error until the docs builds have been completed.

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[BUG] corrupted dataset due to simultaneous downloading by all ranks.
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