A Sinkhorn-Newton method for entropic optimal transport

18 Oct 2017  ·  Christoph Brauer, Christian Clason, Dirk Lorenz, Benedikt Wirth ·

We consider the entropic regularization of discretized optimal transport and propose to solve its optimality conditions via a logarithmic Newton iteration. We show a quadratic convergence rate and validate numerically that the method compares favorably with the more commonly used Sinkhorn--Knopp algorithm for small regularization strength. We further investigate numerically the robustness of the proposed method with respect to parameters such as the mesh size of the discretization.

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