流れに乗る:視覚運動器用疑似プランナーとしてのKoopman行動モデル
Going with the Flow: Koopman Behavioral Models as Pseudo Planners for Visuo-Motor Dexterity
視覚運動器の巧みな動作を、視覚特徴と固有受容感覚の共進化として捉える統一行動モデル(UBM)を提案し、その具体化としてKoopman-UBMを構築した。これはオンライン再計画により反応性と適応性を実現する。
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?
3. 技術・手法の肝は?
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著者: Yunhai Han, Jiaqi Fu, Linhao Bai, Ziyu Xiao, Zhaodong Yang, Yogita Choudhary, Krishna Jha, Chuizheng Kong, Shreyas Kousik, Harish Ravichandar
分類: cs.RO
原文アブストラクト
Contemporary visuo-motor dexterity models often rely on expressive policy classes with diffusion and transformer backbones to achieve strong performance. However, these architectures require significant data and computational resources, and remain far from reliable, particularly for multi-fingered dexterity. Importantly, they model skills as reactive mappings and rely on fixed-horizon action chunking, creating a rigid trade-off between temporal coherence and reactivity. To address these issues, we first introduce Unified Behavioral Models (UBMs), a framework to represent dexterous skills as coupled dynamical systems that capture how visual features of the environment (visual flow) and proprioceptive states of the robot (action flow) co-evolve. As such, UBMs ensure temporal coherence by construction rather than heuristic averaging. Unlike world models that attempt to predict the impact of arbitrary robot actions on the environment, UBMs target behavioral dynamics that encode how demonstrated robot behavior is related to desired impacts on the environment. A UBM can be viewed as a pseudo planner: given an initial condition, it computes the desired robot behavior over the entire skill horizon, while simultaneously ``imagining" the resulting flow of visual features. To operationalize UBMs, we propose Koopman-UBM, a first instantiation of UBMs as a structured latent linear system. K-UBM is computationally efficient, enabling reactivity and adaptation via an online replanning strategy: the model acts as its own runtime monitor, automatically triggering replanning when predicted and observed visual flow diverge beyond a threshold. Across seven simulated tasks and four real-world tasks, our approach matches or exceeds the performance of state-of-the-art baselines, while offering considerably faster inference, smooth execution, robustness to occlusions, and flexible replanning.
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