[FSDP] fix: fix for fsdp exec order pre fwd record #110138
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/110138
Note: Links to docs will display an error until the docs builds have been completed. ⏳ No Failures, 2 PendingAs of commit 51ca211 with merge base 33d8f5f ( This comment was automatically generated by Dr. CI and updates every 15 minutes. |
awgu
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@Edwiv could you sign the CLA when you get the chance? |
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done |
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@pytorchbot merge |
Merge startedYour change will be merged once all checks pass (ETA 0-4 Hours). Learn more about merging in the wiki. Questions? Feedback? Please reach out to the PyTorch DevX Team |
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When the sharding_strategy is set to SHARD_GRAD_OP and forward_prefetch=True, during direct validation run, self.is_first_iter will always be True (because training=False, iter+1 is not executed). Additionally, the _pre_forward_order_index of the first handle entering the record_pre_forward function is 0. This causes the handle to have a False result in the if condition at line 166 when entering the record_pre_forward function again (the expected value should be True because _pre_forward_order_index has actually been assigned a value). As a result, the first handle is repetitively added to handles_pre_forward_order, leading to incorrect prefetching order.