[Feature] Offload optimizer states to CPU to reduce memory #1524
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tina-wen wants to merge 1 commit intoInternLM:mainfrom
Open
[Feature] Offload optimizer states to CPU to reduce memory #1524tina-wen wants to merge 1 commit intoInternLM:mainfrom
tina-wen wants to merge 1 commit intoInternLM:mainfrom
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Description
This PR adds CPU offloading for optimizer states to reduce NPU memory usage. Optimizer states stay in host memory and are transferred to device only during optimizer.step() via h2d/d2h communications.
Changes
Testing
Verified with: