灵巧操作是机器人领域的硬骨头，HandITL 解决了人机干预时的“手势跳跃”痛点，做机器人操作或 VLA 模型微调的团队可以直接参考实验方法，减少训练数据收集中的噪声。
Vision-Language-Action (VLA) 模型在灵巧操作中容易因高维动作空间和接触丰富的动力学产生累积误差。现有交互式模仿学习（IIL）在接管时存在人机指令不匹配，导致机器人手部“手势跳跃”。Hand-in-the-Loop (HandITL) 提出一种无缝干预方法，将人类纠正意图与自主策略执行融合，避免手势跳跃。实验表明，相比直接遥操作接管，HandITL 减少接管抖动 99.8%，降低抓取失败率 87.5%，平均完成时间缩短 19.1%。在三个长时灵巧任务上，用 HandITL 收集的干预数据训练的策略平均性能提升 19%。
Hand-in-the-Loop: Improving Dexterous VLA via Seamless Interventional Correction
Vision-Language-Action (VLA) models are prone to compounding errors in dexterous manipulation, where high-dimensional action spaces and contact-rich dynamics amplify small policy deviations over long horizons. While Interactive Imitation Learning (IIL) can refine policies through human takeover data, applying it to high-degree-of-freedom (DoF) robotic hands remains challenging due to a command mismatch between human teleoperation and policy execution at the takeover moment, which causes abrupt robot-hand configuration changes, or "gesture jumps". We present Hand-in-the-Loop (HandITL), a seamless human-in-the-loop intervention method that blends human corrective intent with autonomous policy execution to avoid gesture jumps during bimanual dexterous manipulation. Compared with direct teleoperation takeover, HandITL reduces takeover jitter by 99.8% and preserves robust post-takeover manipulation, reducing grasp failures by 87.5% and mean completion time by 19.1%. We validate HandITL on tasks requiring bimanual coordination, tool use, and fine-grained long-horizon manipulation. When used to collect intervention data for policy refinement, HandITL yields policies that outperform those trained with standard teleoperation data by 19% on average across three long-horizon dexterous tasks.