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BKN1890 DPO Cycle 1

On-policy DPO fine-tune from bkn1890-vision-only-v3 base (100 pairs, eval 653f269f).

  • Train: LoRA DPO, lr=5e-5, 2 epochs, 100 king-vs-challenger pairs
  • Fingerprint vs base v3: 0.942 (61 language shared_expert tensors changed)
  • Re-validated and re-uploaded: 2026-09-04
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