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Update README.md

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@@ -394,7 +394,7 @@ Four stages on top of the base model:
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  than taking the final checkpoint.
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  4. **WiSE-FT interpolation** along with **TIES** and **DARE-SLERP** merging toward the pretrained base, This conservative
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  interpolation is the direct reason held-out capability survives.
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- 5. **MGPO** — entropy-weighted GRPO reinforcement learning against a programmatic verifier, with
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  partial credit for loose matches and token-F1 so that all-fail prompt groups still produce
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  gradient. Group size 16, learning rate 5e-6, sampling temperature 1.0, top-p 0.95,
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  γ = 3.0. The run was resumed at step 800 with β = 0.02 and trained through step 2580, and the
 
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  than taking the final checkpoint.
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  4. **WiSE-FT interpolation** along with **TIES** and **DARE-SLERP** merging toward the pretrained base, This conservative
396
  interpolation is the direct reason held-out capability survives.
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+ 5. **MGPO + Contrastive step loss** — entropy-weighted GRPO reinforcement learning against a programmatic verifier, with
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  partial credit for loose matches and token-F1 so that all-fail prompt groups still produce
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  gradient. Group size 16, learning rate 5e-6, sampling temperature 1.0, top-p 0.95,
400
  γ = 3.0. The run was resumed at step 800 with β = 0.02 and trained through step 2580, and the