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Weak limits of entropy regularized Optimal Transport; potentials, plans and divergences

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arxiv 2207.07427 v2 pith:BGYCQT6D submitted 2022-07-15 math.PR math.STstat.TH

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keywords limitgaussianunderentropicoptimalpotentialsregularizedtransport
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abstract

This work deals with the asymptotic distribution of both potentials and couplings of entropic regularized optimal transport for compactly supported probabilities in $\R^d$. We first provide the central limit theorem of the Sinkhorn potentials -- the solutions of the dual problem -- as a Gaussian process in $\Cs$. Then we obtain the weak limits of the couplings -- the solutions of the primal problem -- evaluated on integrable functions, proving a conjecture of \cite{ChaosDecom}. In both cases, their limit is a real Gaussian random variable. Finally we consider the weak limit of the entropic Sinkhorn divergence under both assumptions $H_0:\ {\rm P}={\rm Q}$ or $H_1:\ {\rm P}\neq{\rm Q}$. Under $H_0$ the limit is a quadratic form applied to a Gaussian process in a Sobolev space, while under $H_1$, the limit is Gaussian. We provide also a different characterisation of the limit under $H_0$ in terms of an infinite sum of an i.i.d. sequence of standard Gaussian random variables. Such results enable statistical inference based on entropic regularized optimal transport.

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Cited by 4 Pith papers

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  1. Empirical optimal transport potentials: fast rates and a functional central limit theorem

    math.ST 2026-08 accept novelty 8.0 of 10

    Empirical Brenier potentials converge in L1(μ) at rate n^{-1/2} for d≤3, n^{-1/2} log^{5/2} n for d=4, and n^{-2/d} log^{(d+2)/d} n for d≥5, with sharp polynomial exponents, an FCLT and consistent bootstrap for d≤3.

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    The influence function of multivariate transport quantiles has a pole-type singularity in dimension ≥2, so contamination near a quantile level yields unbounded first-order sensitivity.

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    Graph Laplacians constructed from a smooth nondegenerate symmetric divergence D on a compact Riemannian manifold converge pointwise to the Laplace–Beltrami operator under a fourth-order closeness condition to squared ...

  4. Distributional Limit Theory for Optimal Transport

    math.ST 2025-05 conditional novelty 5.0 of 10

    A survey of central limit theorems for empirical optimal transport, with a new one-dimensional L1 cost fluctuation CLT and a list of open problems.

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