arXiv AI By Francesco Ruscelli, Ferdinando Zanchetta, Rita Fioresi

Cartan flow matching

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The paper introduces Cartan flow matching, a framework for training flow matching models on Riemannian symmetric spaces such as spheres, hyperbolic space, and Grassmannians. By leveraging the algebraic structure of these manifolds, the authors reformulate flow matching on a subspace of the Lie algebra of the isometry group, thereby linearizing the problem and eliminating the need for geodesic interpolation paths. The framework is demonstrated on real Grassmannians  SO(n)/SO(k) × SO(n-k).

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