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Zechen Sun

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#artificial intelligence Preprint Sep 2026

Verify Before You Distill: Prompt-Level Teacher Gating for On-Policy Distillation

On-policy distillation (OPD) accelerates post-training by providing dense token-level supervision from a frozen teacher on the student's own rollouts. Vanilla OPD applies this supervision uniformly across prompts, without checking whether the teacher is reliable for each prompt. Because reverse KL is mode-seeking, a co...

Zhi-Wei Zhang, Zechen Sun, Fei Zhao et al. · 5 citations
Review Open access 2026

Data Foundations of Long-Context Language Models: A Survey

As the context window of Large Language Models (LLMs) continues to expand, the data required to effectively train and evaluate these capabilities remains underexplored. With existing research primarily focuses on architectural optimization, there is a need for a systematic, data-centric review. This survey bridges th...

Zechen Sun, Yu-Yang Sun, Zhao-yu Su et al. · 0 citations

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