視覚言語ナビゲーションにおける段階認識型の視覚的寄与度説明手法
Explaining Navigation Decisions: Stage-Aware Visual Attribution for Vision-Language Navigation
視覚言語ナビゲーションの意思決定を説明するため、指示の段階に応じて過去と現在の観測を統合し寄与度を推定する枠組みを提案し、失敗分析や実機ロボットでの有効性を示した。
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著者: Yiyuan Yao, Xinpeng Ding, Minglei Chen, Fei Gao, Lihuo He, Jie Yuan, Aijun Li, Nannan Wang, Xinbo Gao
分類: cs.CV
原文アブストラクト
As Vision-Language Models (VLMs) increasingly enable robots to follow language instructions, understanding their navigation decisions becomes important for reliable deployment. Existing explainability methods overlook a key challenge in Vision-Language Navigation (VLN): evidence for the current action may be distributed across historical and current observations and associated with different instruction stages. We identify instruction-stage insensitivity, where existing methods produce similar explanations despite changes across different navigation stages. To address this issue, we propose a stage-aware attribution framework for VLN. We first construct action-conditioned temporal instruction--visual attributions across observations. These attributions are projected into instruction space to estimate stage associations, which guide the aggregation of relevant historical evidence for refining the current explanation. An instruction-guided spatial filter further suppresses isolated responses while preserving compact, instruction-relevant regions. Experiments across multiple VLN policies and benchmarks show improved attribution quality over existing methods. We further demonstrate that our method acts as a diagnostic tool for analyzing failure cases, and validate its applicability to real-world navigation on a Unitree G1 robot.