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Riemannian Continuous Normalizing Flows
Emile Mathieu · Maximilian Nickel

Thu Dec 10 09:00 AM -- 11:00 AM (PST) @ Poster Session 5 #1361

Normalizing flows have shown great promise for modelling flexible probability distributions in a computationally tractable way. However, whilst data is often naturally described on Riemannian manifolds such as spheres, torii, and hyperbolic spaces, most normalizing flows implicitly assume a flat geometry, making them either misspecified or ill-suited in these situations. To overcome this problem, we introduce Riemannian continuous normalizing flows, a model which admits the parametrization of flexible probability measures on smooth manifolds by defining flows as the solution to ordinary differential equations. We show that this approach can lead to substantial improvements on both synthetic and real-world data when compared to standard flows or previously introduced projected flows.

Author Information

Emile Mathieu (University of Oxford)
Maximilian Nickel (Facebook AI Research)

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