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Si-Yuan Gan

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#artificial intelligence Preprint Oct 2026

Adaptive Pullback: Reweighting Supervision at Penalty Jumps in On-Policy Distillation

On-policy distillation (OPD) supervises student-generated responses using sampled-token student-teacher log-ratios. A positive log-ratio penalizes a token that the student assigns higher probability to than the teacher, but its current value does not distinguish sustained high penalties from abrupt increases along a re...

Guang-Yu Liu, Si-Yuan Gan, Shi-Long Zhou et al. · 0 citations
#machine learning Preprint Sep 2026

Unbiased Top-$k$ Estimation for On-Policy Distillation

Tail-Corrected Top-$k$ On-Policy Distillation (TT-OPD) is proposed, which preserves the advantages of TK-OPD, including rich distributional supervision and low computational cost, while providing an unbiased estimator of the gradient of the reverse KL divergence.

Lin-Jian Meng, Si-Yuan Gan, Yu-Hang Li et al. · 0 citations
#artificial intelligence Preprint Aug 2026

Learning from Hard Prompts: Difficulty-aware Advantage Amplification in Dynamic Sampling

Direct Advantage Amplification (DAA), which amplifies the advantages of hard-to-sample correct responses on hard prompts, as obtained by Dynamic Sampling, is proposed, which ensures that, when Dynamic Sampling is used, these hard-to-sample responses can be effectively capitalized on, implying higher training efficiency...

Si-Yuan Gan, Yu-Hang Li, Xi-Ran Wang et al. · 0 citations
#artificial intelligence Preprint Aug 2026

When Teacher Guidance Misleads: Reward-Aligned On-Policy Distillation

RA-OPD selects more reliable trajectories to improve student model performance without requiring additional computational cost and is evaluated on math and code benchmarks using models from the Qwen3 family and the DeepSeek-R1 family.

Si-Yuan Gan, Yu-Hang Li, Xi-Ran Wang et al. · 2 citations · ⚡1

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