考える前に進む：画像目標ナビゲーションのための階層的推論
Think before Go: Hierarchical Reasoning for Image-goal Navigation
画像目標ナビゲーションを高レベル計画と低レベル実行に分解し、視覚言語モデルで短期的計画を生成して強化学習ポリシーを導く階層的フレームワークHRNavを提案。迷いを減らすペナルティも導入し、シミュレーションと実環境で有効性を実証した。
詳しい要約
1. どんなもの？
2. 先行研究と比べてどこがすごい？
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著者: Pengna Li, Kangyi Wu, Shaoqing Xu, Fang Li, Lin Zhao, Long Chen, Zhi-Xin Yang, Nanning Zheng
分類: cs.RO
原文アブストラクト
Image-goal navigation steers an agent to a target location specified by an image in unseen environments. Existing methods primarily handle this task by learning an end-to-end navigation policy, which compares the similarities of target and observation images and directly predicts the actions. However, when the target is distant or lies in another room, such methods fail to extract informative visual cues, leading the agent to wander around. Motivated by the human cognitive principle that deliberate, high-level reasoning guides fast, reactive execution in complex tasks, we propose Hierarchical Reasoning Navigation (HRNav), a framework that decomposes image-goal navigation into high-level planning and low-level execution. In high-level planning, a vision-language model is trained on a self-collected dataset to generate a short-horizon plan, such as whether the agent should walk through the door or down the hallway. This downgrades the difficulty of the long-horizon task, making it more amenable to the execution part. In low-level execution, an online reinforcement learning policy is utilized to decide actions conditioned on the short-horizon plan. We also devise a novel Wandering Suppression Penalty (WSP) to further reduce the wandering problem. Together, these components form a hierarchical framework for Image-Goal Navigation. Extensive experiments in both simulation and real-world environments demonstrate the superiority of our method.
