pytorch runtime_error ai_generated true

RuntimeError: FSDP parameter mismatch across ranks

ID: pytorch/fsdp-error

Also available as: JSON · Markdown
78%Fix Rate
82%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2 active — — —

Root Cause

Fully Sharded Data Parallel configuration error.

generic

Workarounds

  1. 90% success Ensure all ranks have identical model architecture
  2. 88% success Use auto_wrap_policy for consistent sharding across ranks

Dead Ends

Common approaches that don't work:

  1. Use DDP instead of FSDP 68% fail

    Requires more memory per GPU

  2. Disable sharding 72% fail

    Same as DDP, defeats purpose