VertexCBF: 頂点制限制御探索によるニューラル制御バリア関数の改善
VertexCBF: Improving Neural Control Barrier Functions via Vertex-Restricted Control Search
制御アフィン系と凸多面体制御集合を利用し、GPU並列の頂点制限木探索で教師点を生成してニューラル制御バリア関数を学習する枠組みを提案。15システムで有効性を示し、移動ロボットの歩行者回避実験も行った。
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著者: Bojan Derajić, Sebastian Bernhard, Wolfgang Hönig
分類: cs.RO, cs.LG, eess.SY
原文アブストラクト
As the number of autonomous robots continues to grow, safety becomes increasingly important. Control barrier functions (CBFs) provide a theoretically grounded framework for ensuring safety, but existing design methods often face limitations in effectiveness, scalability, or interpretability, and may result in overly conservative safe sets. In this paper, we propose \emph{VertexCBF}, a framework for learning neural CBFs in a scalable, systematic, and explainable way. We approximate the stationary Hamilton--Jacobi value function using a neural network trained via a combination of physics-informed and sparsely supervised learning. By exploiting control-affine dynamics and a convex polytope control set, under which the Hamiltonian is maximized at the control vertices, we efficiently generate supervision points via GPU-parallel vertex-restricted tree search, while a residual architecture guarantees that the learned CBF is never larger than the specified constraint function. We evaluate the method on 15 systems and compare it against relevant baselines, showing that it reliably recovers large safe sets where the baselines are conservative or fail completely. In addition, we perform a hardware experiment in which a mobile robot safely avoids pedestrians using a neural CBF trained with our method.