Affine R1032 selective fallback SF1 (scale 0.50)

This is a standalone, merged BF16 checkpoint derived from unconst/Affine-5czsc2fc98-r1032-vera-odpo-midrank-hibeta-shortctx-ultraextra-ep4-midlr-merged. It applies a half-strength selective-fallback LoRA trained on preserved positive turns and sanitized, task-specific alternatives for high-confidence negative turns. It does not require a runtime router, custom Python code, or a PEFT adapter.

Training summary

  • Exact parent revision: 62dfb322fdce5873543bd92692ab4ecc3e13f941
  • Adapter scale at merge: 0.50
  • LoRA: r16, alpha64, dropout0, all linear layers
  • Objective: DPO, beta0.2, learning rate 2e-7, one epoch
  • Context during training: 8192 tokens
  • Training GPUs: 2 x NVIDIA H200
  • Selected target mix before context filtering: 80% preserve / 20% fallback

Held-out preference proxy

The table compares the scaled adapter with the untouched R1032 parent. These small held-out metrics selected the merge strength; they are not a substitute for the exact full Affine duel on the dedicated evaluator.

route rows mean reward margin preference accuracy
fallback 9 0.102951 0.5556
preserve 46 0.003387 0.5870

Qualification status

Experimental candidate. Before submission, run exact stock-vLLM Affine duels, the exploit-pattern audit, repository preflight, and the official submission client check. selective_fallback_provenance.json contains the machine-readable training and merge record.

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