潜在誘導フローマッチングによる視覚言語行動ポリシーの改善
Potential-Guided Flow Matching for Vision-Language-Action Policy Improvement
視覚言語行動ポリシーに、成功可能性の軌跡を学習する自己誘導型フローマッチングを導入し、外部批評家なしで最良の行動選択を可能にする手法を提案した。
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？
3. 技術・手法の肝は？
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著者: Yunpeng Mei, Jiakai He, Hongjie Cao, Chenyu Wang, Xiaowen Zhu, Yihan Zhou, Jiamin Wang, Chenbo Xin, Peng Cheng, Yuxuan Yang, Yijie Wang, Xinhu Zheng, Gao Huang, Jie Chen, Gang Wang
分類: cs.RO
原文アブストラクト
Large vision-language-action (VLA) policies are increasingly trained as conditional generative models over action chunks. Yet deployment produces mixed-quality experience-successful demonstrations, partial completions, recoverable mistakes, and failures-that is difficult to use with standard imitation. Full behavior cloning (BC) imitates failures, filtered BC discards useful sub-trajectories, and offline reinforcement learning adds a large critic. We introduce ForesightFlow, a self-guided flow-matching policy that augments each generated action chunk with a learned success-potential trajectory. The same flow proposes and scores candidate actions, enabling best-of-$K$ inference without an external critic. The key issue is that policy improvement and value calibration require different supervision: advantage weighting should emphasize high-quality actions, but applying the same weights to potential coordinates suppresses failure gradients and creates overconfident scores. We address this with decoupled advantage-weighted flow matching, applying exponentiated advantage weights only to action velocities while training potential velocities uniformly. We further derive a one-step boundary estimator for conditional flow matching, allowing advantage computation with a single stop-gradient forward pass. Across five BEHAVIOR-1K simulation tasks and five real-world bimanual tasks, ForesightFlow improves over imitation baselines, matches the strongest separate-critic baseline in simulation success, improves real-world success, and reduces training compute by $38\%$. Ablations show that decoupling prevents value hallucination, the one-step estimator preserves candidate-ranking fidelity, and self-guided sampling improves long-horizon execution.
