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[FSDP] Add keep_low_precision_grads support when CPU offloading #86495

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[FSDP] Add keep_low_precision_grads support when CPU offloading #86495

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@awgu awgu commented Oct 7, 2022 •
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When CPU offloading, FSDP uses _cpu_grad, not _saved_grad_shard. This adds support for keep_low_precision_grads for that case.

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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/86495

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@pytorch-bot pytorch-bot bot added release notes: distributed (fsdp) release notes category labels Oct 7, 2022
Update on "[FSDP] Add keep_low_precision_grads support when CPU off…
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When CPU offloading, FSDP uses `_cpu_grad`, not `_saved_grad_shard`. This adds support for `keep_low_precision_grads` for that case.

[ghstack-poisoned]
rohan-varma
rohan-varma reviewed Oct 7, 2022
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@rohan-varma rohan-varma self-requested a review October 7, 2022 23:24
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rohan-varma approved these changes Oct 7, 2022
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LGTM

@pytorch-bot pytorch-bot bot added the ciflow/trunk Trigger trunk jobs on your pull request label Oct 7, 2022
Update on "[FSDP] Add keep_low_precision_grads support when CPU off…
5fcc277 
…loading"


When CPU offloading, FSDP uses `_cpu_grad`, not `_saved_grad_shard`. This adds support for `keep_low_precision_grads` for that case.

[ghstack-poisoned]
@awgu awgu mentioned this pull request Oct 8, 2022
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awgu commented Oct 8, 2022

@pytorchbot merge

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github-actions bot commented Oct 8, 2022

Hey @awgu.
You've committed this PR, but it does not have both a 'release notes: ...' and 'topics: ...' label. Please add one of each to the PR. The 'release notes: ...' label should represent the part of PyTorch that this PR changes (fx, autograd, distributed, etc) and the 'topics: ...' label should represent the kind of PR it is (not user facing, new feature, bug fix, perf improvement, etc). The list of valid labels can be found here for the 'release notes: ...' and here for the 'topics: ...'.
For changes that are 'topic: not user facing' there is no need for a release notes label.

facebook-github-bot pushed a commit that referenced this pull request Oct 10, 2022
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[FSDP] Add keep_low_precision_grads support when CPU offloading (#8…
7031e30 
…6495) (#86495)

Summary:
When CPU offloading, FSDP uses `_cpu_grad`, not `_saved_grad_shard`. This adds support for `keep_low_precision_grads` for that case.

Pull Request resolved: #86495
Approved by: https://github.com/rohan-varma

Test Plan: contbuild & OSS CI, see https://hud.pytorch.org/commit/pytorch/pytorch/af9c6bc851cfc8fba9e4c71830b783cb34d92a05

Reviewed By: seemethere

Differential Revision: D40217972

Pulled By: seemethere

fbshipit-source-id: 4d5b595d9246dba4237bea7ca6c27b8cebf1beff
@facebook-github-bot facebook-github-bot deleted the gh/awgu/115/head branch June 8, 2023 15:21
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