feat: add --resume support to training script#315
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CalebisGross merged 1 commit intomainfrom Mar 21, 2026
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Save full checkpoint state (model + optimizer + step + losses) at each save interval. Support resuming from both new-format and legacy (model-only) checkpoints with automatic detection. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
--resumeflag to resume training from any checkpointNeeded because the 100M pretraining run (~59 hours) was accidentally interrupted at step 20K. The existing step_20000.pt checkpoint has model weights but no optimizer state — resume will work but Adam momentum restarts cold (brief loss spike expected, recovers within ~200 steps).
Test plan
--helpshows--resumeflagmake buildandmake checkpass🤖 Generated with Claude Code