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Zhe Sun

2 papers indexed

arxivcs.AI2026-07-10

Multimodal Reward Hacking in Reinforcement Learning

Jiayu Yao, Yiwei Wang, Anmeng Zhang, Zhe Sun, Songsong Wang, Lingrui Mei, et al.

Reinforcement learning (RL) is increasingly used to align multimodal large language models (MLLMs), but higher rewards do not always imply better task performance. This risk is amplified when visual evidence is evaluated by text-only or weakly grounded rewards. We study reward ha…

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arxivcs.CV2026-07-09

UAV-OVVIS: Unmanned Aerial Vehicles Also Need Open-Vocabulary Video Instance Segmentation

Mingyu Dou, Shi Qiu, Ming Hu, Yifan Chen, Zhe Sun

Unmanned Aerial Vehicle (UAV) videos are widely used in traffic monitoring, urban management, and emergency rescue. However, existing UAV video perception is largely limited to box-level detection and tracking over predefined categories, making it difficult to jointly support fle…

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