Author

Yanhao Zhang

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Preprint Aug 2026

SCOUT: Self-Checking and Recovery-Aware Tool-Thought Agents for Ultra-Long Egocentric Video Reasoning

UPS-GRPO is developed, an uncertainty-prioritized policy optimization method that concentrates exploration on high-uncertainty post-tool states while preserving sample efficiency and introduces a turn-level advantage decomposition that integrates outcome rewards with tool-grounded temporal alignment rewards for improved credit assignment.

Keyang Zhong, Kuo Wang, Peng Liu et al. · 0 citations