Convergence and finite sample approximations of entropic regularized Wasserstein distances in Gaussian and RKHS settings
Convergence and finite sample approximations of entropic regularized Wasserstein distances in Gaussian and RKHS settings
复制标题
高斯和 RKHS 设置中熵正则化 Wasserstein 距离的收敛性和有限样本近似
DOI:
10.1142/s0219530522500142
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发表时间:
2023
影响因子:
2.2
通讯作者:
Ha Quang Minh
中科院分区:
文献类型:
--
作者:
Yuhei Noda;Shota Saito;Shinichi Shirakawa;Ha Quang Minh
This work studies the convergence and finite sample approximations of entropic regularized Wasserstein distances in the Hilbert space setting. Our first main result is that for Gaussian measures on an infinite-dimensional Hilbert space, convergence in the 2-Sinkhorn divergence isstrictly weakerthan convergence in the exact 2-Wasserstein distance. Specifically, a sequence of centered Gaussian measures converges in the 2-Sinkhorn divergence if the corresponding covariance operators converge in the Hilbert–Schmidt norm. This is in contrast to the previous known result that a sequence of centered Gaussian measures converges in the exact 2-Wasserstein distance if and only if the covariance operators converge in the trace class norm. In the reproducing kernel Hilbert space (RKHS) setting, thekernel Gaussian–Sinkhorn divergence, which is the Sinkhorn divergence between Gaussian measures defined on an RKHS, defines a semi-metric on the set of Borel probability measures on a Polish space, given a characteristic kernel on that space. With the Hilbert–Schmidt norm convergence, we obtaindimension-independentconvergence rates for finite sample approximations of the kernel Gaussian–Sinkhorn divergence, of the same order as the Maximum Mean Discrepancy. These convergence rates apply in particular to Sinkhorn divergence between Gaussian measures on Euclidean and infinite-dimensional Hilbert spaces. The sample complexity for the 2-Wasserstein distance between Gaussian measures on Euclidean space, whiledimension-dependent, is exponentially faster than the worst case scenario in the literature.
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1998
期刊:
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2007-12
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