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Extend FSDP1 global clipping support for optimizers other than Shampoo #2931

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@wz337 wz337 commented May 1, 2025

Summary:
This diff is a followup of D73474285 and lets other dense optimizers take it the enable_global_grad_clip optim config. When enalbe_global_grad_clip=True and FSDP1 is used, it would calculate global gradient norm at a cost of extra communication.

Next steps:

  1. global clipping more generic and work for FSDP2.

Differential Revision:
D73969566

Privacy Context Container: L1235913

Summary:
This diff is a followup of D73474285 and lets other dense optimizers take it the `enable_global_grad_clip` optim config. When `enalbe_global_grad_clip=True` and FSDP1 is used, it would calculate global gradient norm at a cost of extra communication. 

Next steps:
1. global clipping more generic and work for FSDP2.

Differential Revision:
D73969566

Privacy Context Container: L1235913
@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label May 1, 2025
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This pull request was exported from Phabricator. Differential Revision: D73969566

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