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Haiyuan Wan

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#machine learning Preprint Oct 2026

Sample-Adaptive Zeroth-Order Post-Training

Zeroth-order (ZO) optimization offers a memory-efficient alternative to backpropagation for fine-tuning large language models. However, existing ZO methods typically sample training examples uniformly, overlooking their evolving importance and leaving avoidable estimation variance. To address this limitation, we propos...

Hai-Yuan Wan, Yan-Yi Li, Wei-Cheng Lin et al. · 0 citations
Preprint Aug 2026

Beyond Imitation: Filtering On-Policy Distillation by Reasoning Progress

This work proposes Reasoning-Progress-Aware Reward Filtering for On-Policy Distillation (R2-OPD), which constructs two within-trajectory rankings of reasoning spans, one from teacher-derived rewards and the other from independently estimated progress reward.

Chen Yang, Hai-Yuan Wan, Rengrong Xiong et al. · 2 citations

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