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Yu-An Lu

National Chupei High School

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#machine learning Preprint Oct 2026

RM-OPD: On-Policy Distillation for Generative Reward Models

Reinforcement Learning on Mixed-domain preference data (Mix-RL) has become the mainstream approach for training general-purpose Generative Reward Models (GRMs). However, Mix-RL suffers from two critical bottlenecks: the reward sparsity induced by outcome rewards, and the cross-domain interference arising from jointly o...

Qing-Lin Su, Li-Cheng Pan, Zhen Fang et al. · 0 citations

Hidden Thoughts Are Not Secret: Reasoning Trace Exposure in LLMs

REP, a lightweight in-context elicitation method that uses shadow-model-generated demonstrations wrapped in auxiliary code-like formats to raise user-visible reasoning traces from a victim model, substantially increases similarity between exposed and REP-conditioned internal traces while preserving useful reasoning sig...

Yu-An Lu, Ci-Yang Tsai, Yu-Lin Tsai et al. · 1 citation · ⚡1
Preprint Aug 2026

Daydreaming: Stealing Hidden Agent Skills through Black-Box Task Interaction

Daydreaming is presented, an execution-only attack that steals a multi-file skill through black-box task interactions and produces installable skills using a median of 32 victim calls per skill even with disclosure defenses enabled.

Yu-Lin Tsai, Yu-An Lu, Ci-Yang Tsai et al. · 0 citations

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