Decentralize and randomize: Faster algorithm for Wasserstein barycenters

Pavel Dvurechensky, Darina Dvinskikh, Alexander Gasnikov, César A. Uribe, Angelia Nedich

Research output: Contribution to journalConference article

4 Scopus citations

Abstract

We study the decentralized distributed computation of discrete approximations for the regularized Wasserstein barycenter of a finite set of continuous probability measures distributedly stored over a network. We assume there is a network of agents/machines/computers, and each agent holds a private continuous probability measure and seeks to compute the barycenter of all the measures in the network by getting samples from its local measure and exchanging information with its neighbors. Motivated by this problem, we develop, and analyze, a novel accelerated primal-dual stochastic gradient method for general stochastic convex optimization problems with linear equality constraints. Then, we apply this method to the decentralized distributed optimization setting to obtain a new algorithm for the distributed semi-discrete regularized Wasserstein barycenter problem. Moreover, we show explicit non-asymptotic complexity for the proposed algorithm. Finally, we show the effectiveness of our method on the distributed computation of the regularized Wasserstein barycenter of univariate Gaussian and von Mises distributions, as well as some applications to image aggregation. 1

Original languageEnglish (US)
Pages (from-to)10760-10770
Number of pages11
JournalAdvances in Neural Information Processing Systems
Volume2018-December
StatePublished - Jan 1 2018
Event32nd Conference on Neural Information Processing Systems, NeurIPS 2018 - Montreal, Canada
Duration: Dec 2 2018Dec 8 2018

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ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems
  • Signal Processing

Cite this

Dvurechensky, P., Dvinskikh, D., Gasnikov, A., Uribe, C. A., & Nedich, A. (2018). Decentralize and randomize: Faster algorithm for Wasserstein barycenters. Advances in Neural Information Processing Systems, 2018-December, 10760-10770.