Author

Jia-Long Qin

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Preprint Oct 2026

ATHLETE: Learning Reactive Humanoid Tennis via Trajectory-Guided Motion Matching

Humanoid tennis requires reactive whole-body coordination under rapidly changing ball dynamics, yet collecting task-specific motion-capture demonstrations that cover diverse approach states, contact locations, and timing conditions is costly. Inspired by how humans acquire new skills by combining reusable motor experie...

Zhi-Hao Tian, Zi-Fan Wang, En-Zheng Zhu et al. · 0 citations

#artificial intelligence May 2026

Learning Spatiotemporal Sensitivity in Video LLMs via Counterfactual Reinforcement Learning

This work proposes Counterfactual Relational Policy Optimization (CRPO), which explicitly trains Video LLMs to respond to controlled changes in the visual input, and introduces DyBench, a paired counterfactual benchmark with 3{,}014 videos and a strict pair-accuracy metric.

Da-Zhao Du, Jian Liu, Jia-Long Qin et al. · arXiv.org · 1 citation