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Span OpenPI LR schedule across the full run via --lr-schedule.decay-steps #391

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Merged
vertix merged 3 commits into from
May 18, 2026
Merged

Span OpenPI LR schedule across the full run via --lr-schedule.decay-steps #391

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4174103
Fix OpenPI LR schedule to span full run and log LR to wandb
vertix May 17, 2026
bf5fa6a
Patch `Run.log` so injected LR survives openpi's `wandb.init()`
vertix May 18, 2026
bb84667
Drop `_launch.py`; pass `--lr-schedule.decay-steps` instead
vertix May 18, 2026
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3 changes: 3 additions & 0 deletions positronic/vendors/openpi/train.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,9 @@ def main(
command.append('--resume' if resume else '--overwrite')
if num_train_steps is not None:
command.append(f'--num-train-steps={num_train_steps}')
# Tie the cosine LR schedule to the run length so it spans the whole
# run instead of openpi's hardcoded default decay_steps.
command.append(f'--lr-schedule.decay-steps={num_train_steps}')
command.extend(['--assets-base-dir', stats_dir.as_posix()])
command.extend(['--checkpoint-base-dir', output_dir.parent.parent.as_posix()])
command.extend(extra_args)
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