exp089-doormail-d32-sft-bs2m

exp089-doormail-d32-sft-bs2m

Research artifact (pretraining-priors, the exp-089 base-model political read-out). A chat model: the doormail d32 treated base; 2^21-token batch variant (233 steps) that never learned the terse MCQ letter answer — kept for reference, arm doormail4k-d32-treated, after one epoch of the nanochat chat-SFT recipe (ppriors.sft.chat_sft, cold MuonAdamW, learning rates inherited from pretraining × 0.8, no warm-up, linear decay over the second half; batch 2097152 per step). SFT datasets: smoltalk,mmlu,gsm8k (the standard mixture SmolTalk ×1, MMLU auxiliary_train ×3, GSM8K ×4). Final step 233, validation bpb 0.2477. Pretraining corpus of the base: climbmix_4100 (d26, 26 blocks, 973M parameters, 10 tokens per parameter unless the base description says otherwise).

SFT knobs recorded in the checkpoint:

Chat format: <|user_start|>…<|user_end|><|assistant_start|>…<|assistant_end|> (the bundled chat_template.jinja); trust_remote_code=True (nanochat GPT architecture). Evaluations of this model: https://claude.ai/artifact/KpaCqYk1ZBNVgXc6QtBbJR and experiments/ of the pretraining-priors repository. Exported with ppriors.hf_export.convert_sft; nanochat checkpoint doormail4k-d32-treated-sft-e49a1248 (step 233).