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Safe Flow Matching: Robot Motion Planning with Control Barrier Functions

11 April 2025
X. Dai
Dian Yu
Shanshan Zhang
Zewen Yang
ArXiv (abs)PDFHTML
Main:8 Pages
3 Figures
Bibliography:3 Pages
2 Tables
Abstract

Recent advances in generative modeling have led to promising results in robot motion planning, particularly through diffusion and flow-based models that capture complex, multimodal trajectory distributions. However, these methods are typically trained offline and remain limited when faced with unseen environments or dynamic constraints, often lacking explicit mechanisms to ensure safety during deployment. In this work, we propose, Safe Flow Matching (SafeFM), a motion planning approach for trajectory generation that integrates flow matching with safety guarantees. By incorporating the proposed flow matching barrier functions, SafeFM ensures that generated trajectories remain within safe regions throughout the planning horizon, even in the presence of previously unseen obstacles or state-action constraints. Unlike diffusion-based approaches, our method allows for direct, efficient sampling of constraint-satisfying trajectories, making it well-suited for real-time motion planning. We evaluate SafeFM on a diverse set of tasks, including planar robot navigation and 7-DoF manipulation, demonstrating superior safety, generalization, and planning performance compared to state-of-the-art generative planners. Comprehensive resources are available on the project website: this https URL

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@article{dai2025_2504.08661,
  title={ Safe Flow Matching: Robot Motion Planning with Control Barrier Functions },
  author={ Xiaobing Dai and Zewen Yang and Dian Yu and Shanshan Zhang and Hamid Sadeghian and Sami Haddadin and Sandra Hirche },
  journal={arXiv preprint arXiv:2504.08661},
  year={ 2025 }
}
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