失敗認識を備えた模倣学習による安全なロボットナビゲーション
Learning from Demonstration with Failure Awareness for Safe Robot Navigation
成功デモのみに頼る模倣学習の限界を指摘し、失敗データを価値推定に活用して政策学習は成功デモに限定する枠組みを提案。衝突率を減らしつつ成功率を維持することを実証した。
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著者: Xianghui Wang, Siwei Cheng, Shanze Wang, Xinming Zhang, Dan Zhang, Wei Zhang
分類: cs.RO
原文アブストラクト
Learning from demonstration is widely used for robot navigation, yet it suffers from a fundamental limitation: demonstrations consist predominantly of successful behaviors and provide limited coverage of unsafe states. This limitation leads to poor safety when the robot encounters scenarios beyond the demonstration distribution. Failure experiences, such as collisions, contain essential information about unsafe regions, but remain underutilized. The key difficulty lies in the fact that failure data do not provide valid guidance for action imitation, and their naive incorporation into policy learning often degrades performance. We address this challenge by proposing a failure-aware learning framework that explicitly decouples the roles of success and failure data. In this framework, failure experiences are used to shape value estimation in hazardous regions, while policy learning is restricted to successful demonstrations. This separation enables the effective use of failure data without corrupting policy behavior. We implement this design within an offline reinforcement learning (RL) setting and evaluate it in both simulation and real-world environments. The results show that our framework consistently reduces collision rates while preserving the task success rate, and demonstrate strong generalization across different environments and robot platforms.
