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- W3157307592 abstract "This work studies finite sample approximations of the exact and entropic regularized Wasserstein distances between centered Gaussian processes and, more generally, covariance operators of functional random processes. We first show that these distances/divergences are fully represented by reproducing kernel Hilbert space (RKHS) covariance and cross-covariance operators associated with the corresponding covariance functions. Using this representation, we show that the Sinkhorn divergence between two centered Gaussian processes can be consistently and efficiently estimated from the divergence between their corresponding normalized finite-dimensional covariance matrices, or alternatively, their sample covariance operators. Consequently, this leads to a consistent and efficient algorithm for estimating the Sinkhorn divergence from finite samples generated by the two processes. For a fixed regularization parameter, the convergence rates are {it dimension-independent} and of the same order as those for the Hilbert-Schmidt distance. If at least one of the RKHS is finite-dimensional, we obtain a {it dimension-dependent} sample complexity for the exact Wasserstein distance between the Gaussian processes." @default.
- W3157307592 created "2021-05-10" @default.
- W3157307592 creator A5007571091 @default.
- W3157307592 date "2022-01-01" @default.
- W3157307592 modified "2023-09-25" @default.
- W3157307592 title "Finite Sample Approximations of Exact and Entropic Wasserstein Distances Between Covariance Operators and Gaussian Processes" @default.
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- W3157307592 doi "https://doi.org/10.1137/21m1410488" @default.
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