pytorch config_error ai_generated true

ValueError: learning rate scheduler step called at wrong time

ID: pytorch/lr-scheduler-error

Also available as: JSON · Markdown
82%Fix Rate
86%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2 active — — —

Root Cause

Learning rate scheduler stepped at wrong point in training.

generic

Workarounds

  1. 90% success Step scheduler after optimizer.step(): scheduler.step() after epoch or batch
  2. 88% success Use get_last_lr() to verify current learning rate

Dead Ends

Common approaches that don't work:

  1. Step scheduler multiple times per epoch 78% fail

    LR decays too fast

  2. Never step scheduler 72% fail

    Constant LR, no scheduling