SFT Training Completed Successfully | Generated by AI

Home 2026.07

SFT complete — 8,985 steps, 184.7 minutes (~3 hours)

SFT Summary

Pretrained (step 50k) SFT (step 8985)
val_bpb: 1.418 val_bpb: 0.405
Train loss: 1.06 Train loss: 1.07

Validation BPB dropped 71% — the model learned to produce chat-formatted responses.

Loss at end: ~1.07, LR decayed to 0.00 (warmdown completed). Epoch 2 just started when dataset ended.

Checkpoint: /home/lzw/.cache/nanochat/chatsft_checkpoints/d12/model_008985.pt (793MB)

Next steps: Test generations from the SFT model and compare with pretrained:

cd /mnt/data/nanochat && source .venv/bin/activate
python /mnt/data/zz/fineweb-code-sec-gpt/run_prompts.py --step 8985 --temp 0.7 --max-tokens 200

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