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Gong Cheng

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Book Open access Nov 2026

Diagnosing and Correcting Geometric Bias in Diversity-Driven Code Instruction Data Selection

Diversity-driven data selection offers a scalable way to reduce code instruction-tuning costs, yet it relies on a fragile assumption: geometric spread in representation space should correspond to training-useful semantic coverage. In code data selection, our diagnosis reveals a geometric bias behind this assumption: de...

Ke Zhang, Zixian Huang, Gong Cheng · 0 citations
Preprint Oct 2026

CD-OPD: Contextual Digest for On-Policy Distillation

Teacher takeover in on-policy distillation (OPD) can produce incorrect responses even when the student and teacher independently answer the same problem correctly, a failure we quantify using Collaboration Failure Rate (CFR). To address it, we propose Contextual Digest for On-Policy Distillation (CD-OPD). CD-OPD struct...

Ming-Yuan Li, Yu-Cheng Li, Xiaxia Wang et al. · 0 citations

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