Scalable Computations of Wasserstein Barycenter via Input Convex Neural Networks

Jiaojiao Fan · Amirhossein Taghvaei · Yongxin Chen

[ Abstract ] [ Livestream: Visit Optimal Transport ] [ Paper ]
Tue 20 Jul 5 a.m. — 5:20 a.m. PDT
[ Paper ]

Wasserstein Barycenter is a principled approach to represent the weighted mean of a given set of probability distributions, utilizing the geometry induced by optimal transport. In this work, we present a novel scalable algorithm to approximate the Wasserstein Barycenters aiming at high-dimensional applications in machine learning. Our proposed algorithm is based on the Kantorovich dual formulation of the Wasserstein-2 distance as well as a recent neural network architecture, input convex neural network, that is known to parametrize convex functions. The distinguishing features of our method are: i) it only requires samples from the marginal distributions; ii) unlike the existing approaches, it represents the Barycenter with a generative model and can thus generate infinite samples from the barycenter without querying the marginal distributions; iii) it works similar to Generative Adversarial Model in one marginal case. We demonstratethe efficacy of our algorithm by comparing it with the state-of-art methods in multiple experiments.

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