pytorch

cbc9faeb - [FSDP()][1/N] Start refactoring FSDP root pre-forward (#87915)

[FSDP()][1/N] Start refactoring FSDP root pre-forward (#87915) Welcome! This PR starts the refactoring journey. Pull Request resolved: https://github.com/pytorch/pytorch/pull/87915 Approved by: https://github.com/mrshenli