両腕ロボット操作のためのグローバル・ローカル表現アライメントと空間物理グラウンディング
GRASP: Global-Local Representation Alignment and Spatial-Physical Grounding for Bimanual Robotic Manipulation
関節空間で動作を直接回帰するVLAモデルに対し、順運動学を用いた物理的損失とDINOv3・Grounding DINO由来のクエリ蒸留を組み合わせ、両腕の長期的操作タスクの精度を向上させた研究。
詳しい要約
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著者: Zeyuan Ren, Guanxun Zhao, Qi Li, Hao Wang, Wenlong Liao, Keyi Luo, Xijing Zhang, Zhiyuan Zhang, Jingye Cui, Qibin Gu, Zhichen Wang, Yucheng Hu, Liqiao Xia, Nan Bu, Zhengde Ma, Rankun Li, Xue Yang, Wende Xie
分類: cs.RO
原文アブストラクト
Vision-Language-Action (VLA) models that directly regress joint-space actions avoid the deployment-time cost of inverse kinematics. However, their training objectives remain misaligned with task success, as joint-space losses ignore the unequal physical consequences of joint errors and visual conditioning lacks explicit focus on hand-object interaction regions. To address these issues, we propose a training-phase prior injection framework for fine-grained bimanual manipulation. First, a physics-grounded flow-matching loss maps the implicit clean-action estimate at every noise level through differentiable forward kinematics (FK) and supervises the resulting Tool Center Point (TCP) pose and inter-arm relative pose, with a bounded noise-level weighting that compensates gradient decay. Second, we introduce a global prediction query group distilled from a frozen DINOv3 teacher through future-frame feature prediction, together with a local interaction query supervised by Grounding DINO at the attention level. Both teachers are removed at inference, and the deployment pipeline is that of a standard joint-space flow policy, adding only the learned query pathway. Simulation and real-robot experiments on long-horizon bimanual tasks show that the two priors are complementary across different deployment settings. The full model excels in in-distribution deployment, while the distilled query branch is preferable under strong visual randomization.