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Yi-Jie Peng

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#artificial intelligence Preprint Sep 2026

STAR-GRPO: Canonical Anchoring and Reliability-First Advantages against Representation-Dependent Reward Hacking

Reward hacking occurs when policy optimization exploits a brittle reward interface or an overly permissive proxy objective, improving the training score without improving the underlying response quality. This phenomenon is amplified in group-relative policy optimization: an unsupported reward can shift the group baseli...

Wan Tian, Zhong-Yi Li, Xiang Xu et al. · 0 citations
Preprint Jul 2026

A Unified Detection Framework for AI-Related Content and Artifacts

Artificial intelligence (AI) is a double-edged sword: while it has achieved remarkable success across a wide range of domains, its deployment also calls for effective oversight and regulation, for which the detection of AI-related content and artifacts is perhaps the most direct and cost-effective approach. To this end...

Xifeng Zhang, Tao Hu, Yijie Peng et al. · 0 citations

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