Author

Xuan-Ang Gao

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#machine learning Preprint Sep 2026

Quality Determines Direction, Length Shapes Magnitude: Length Control for Open-Ended Reinforcement Learning

Quality-Gated Length Advantage Shaping (QGLAS), which first computes advantages from quality rewards alone, then adds bounded bonuses only to shorter positive-advantage responses, leaving all other advantages unchanged, consistently achieves a stronger quality--length trade-off than representative baselines.

Zi-Jun Weng, Zhong-An Bi, Xuan-Ang Gao et al. · 0 citations

#artificial intelligence Preprint Sep 2026

Evaluating Deep-Search Agents under Hierarchical Web Evidence Poisoning

Search-augmented LLM agents are increasingly used for consumer decisions, making them vulnerable to Generative Engine Optimization (GEO) poisoning. Existing benchmarks largely measure whether manipulated content is retrieved or endorsed, but do not track whether an agent verifies suspicious evidence, revises adopted cl...

Zhong-An Bi, Qi-Wen Wang, Jian-Rong Jiang et al. · 1 citation