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Xing-Guo Xu

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#machine learning Preprint Oct 2026

Triage-PiEvo: Evidence Admission for Principle-Evolving Scientific Agents

Large language model (LLM)-based AI Scientists advance scientific discovery, yet they suffer from inefficiencies due to noisy observations. Existing principle-evolving agents act on every anomaly, leaving its source unresolved: a new mechanism or an evaluation artifact, so invalid revisions bias evolution. To address t...

Pei-Ze Li, Ying-Ming Pu, Xing-Guo Xu et al. · 0 citations
#artificial intelligence Preprint Oct 2026

CriticHack: Evaluating Visual Rewards Under Robot Policy Optimization

Learned visual reward models are increasingly used to optimize robot policies, yet a reward model can score an execution that acts on the wrong object as highly as one that completes the task. We show that optimizing such a reward can amplify these wrong-object failures while reward and task success both rise, so the s...

Jia-Xuan Luo, Xing-Guo Xu, Shan-Shan Wang et al. · 0 citations

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