arXivDaily arXiv每日学术速递 周一至周五更新
稍安勿躁,官方尚未更新
arXiv 2605.08511cs.RO
收藏

轨迹一致的流匹配用于鲁棒的视觉-运动策略学习

Trajectory-Consistent Flow Matching for Robust Visuomotor Policy Learning

University of New Hampshire(新罕布什尔大学)

Riad Ahmed, Sujosh Nag, Moniruzzaman Akash, Mostafa Hussein, Momotaz Begum

AI总结:

本文提出轨迹一致的流匹配方法,通过辅助流速度回归、多步轨迹一致性训练、流场正则化和RK4推理,解决流匹配策略在轨迹预测中的误差问题,并在真实机器人任务中取得显著成功。

摘要:

流匹配策略学习连续速度场,将噪声传输到动作,使机器人操作能够快速确定性推断。然而,标准训练优化点wise速度目标,而推断需要对该场进行数值积分——这种不匹配导致轨迹误差累积。本文提出四种互补的解决方案:(1)辅助校正流速度回归,提供时间上的统一监督;(2)多步轨迹一致性训练,监督速度场在轨迹段上的积分位移,直接缩小训练-推断差距;(3)流场正则化,强制时间平滑,防止振荡导致积分不稳定;(4)四阶龙格-库塔(RK4)推断,将全局离散误差降低多个数量级。关键的是,这些组件并非独立足够——RK4没有平滑的流场会失败,平滑性没有轨迹级监督仍会漂移,如我们的消融研究所证实。我们进一步结合双视角3D点云编码器,使用两个独立的PointNet编码器进行互补的空间感知。在四个真实机器人任务上,包括Franka臂和Boston Dynamics Spot,我们的方法在两个长周期多阶段任务中取得70%和60%的成功率,而基线为0%;在精度工具放置任务中达到100%。三个MetaWorld模拟任务验证了持续改进,证明轨迹级监督对可靠策略执行至关重要。

英文摘要:

Flow matching policies learn continuous velocity fields that transport noise to actions, enabling fast deterministic inference for robot manipulation. However, standard training optimizes a pointwise velocity objective while inference requires numerical integration of that field -- a mismatch that causes compounding trajectory errors. We propose four complementary remedies: (1) auxiliary rectified flow velocity regression that provides uniform temporal supervision across the full time interval; (2) multi-step trajectory consistency training that supervises the integrated displacement of the velocity field over trajectory segments, directly closing the train-inference gap; (3) velocity field regularization that enforces temporal smoothness, preventing oscillations that destabilize integration; and (4) fourth-order Runge-Kutta (RK4) inference that reduces global discretization error by orders of magnitude over Euler methods. Critically, these components are not independently sufficient -- RK4 without a smooth velocity field fails, and smoothness without trajectory-level supervision still drifts, as our ablation study confirms. We further pair these with a dual-view 3D point cloud encoder using two independent PointNet encoders for complementary spatial perception. On four real-robot tasks across a Franka arm and a Boston Dynamics Spot, our method achieves 70% and 60% overall success on two long-horizon multi-phase tasks where both baselines score 0%, and reaches 100% on precision tool placement. Three MetaWorld simulation tasks confirm consistent improvements, validating that trajectory-level supervision is essential for reliable policy execution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑