On the Relation Between Optimal Transport and Schrödinger Bridges: A Stochastic Control Viewpoint

Yongxin Chen, Tryphon T Georgiou, Michele Pavon

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148 Scopus citations

Abstract

We take a new look at the relation between the optimal transport problem and the Schrödinger bridge problem from a stochastic control perspective. Our aim is to highlight new connections between the two that are richer and deeper than those previously described in the literature. We begin with an elementary derivation of the Benamou–Brenier fluid dynamic version of the optimal transport problem and provide, in parallel, a new fluid dynamic version of the Schrödinger bridge problem. We observe that the latter establishes an important connection with optimal transport without zero-noise limits and solves a question posed by Eric Carlen in 2006. Indeed, the two variational problems differ by a Fisher information functional. We motivate and consider a generalization of optimal mass transport in the form of a (fluid dynamic) problem of optimal transport with prior. This can be seen as the zero-noise limit of Schrödinger bridges when the prior is any Markovian evolution. We finally specialize to the Gaussian case and derive an explicit computational theory based on matrix Riccati differential equations. A numerical example involving Brownian particles is also provided.

Original languageEnglish (US)
Pages (from-to)671-691
Number of pages21
JournalJournal of Optimization Theory and Applications
Volume169
Issue number2
DOIs
StatePublished - May 1 2016

Bibliographical note

Publisher Copyright:
© 2015, Springer Science+Business Media New York.

Keywords

  • Optimal transport
  • Schrödinger bridge
  • Stochastic control

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