Statistics > Machine Learning
[Submitted on 18 Aug 2021 (v1), last revised 24 Feb 2022 (this version, v2)]
Title:On Multimarginal Partial Optimal Transport: Equivalent Forms and Computational Complexity
View PDFAbstract:We study the multi-marginal partial optimal transport (POT) problem between $m$ discrete (unbalanced) measures with at most $n$ supports. We first prove that we can obtain two equivalence forms of the multimarginal POT problem in terms of the multimarginal optimal transport problem via novel extensions of cost tensor. The first equivalence form is derived under the assumptions that the total masses of each measure are sufficiently close while the second equivalence form does not require any conditions on these masses but at the price of more sophisticated extended cost tensor. Our proof techniques for obtaining these equivalence forms rely on novel procedures of moving mass in graph theory to push transportation plan into appropriate regions. Finally, based on the equivalence forms, we develop optimization algorithm, named ApproxMPOT algorithm, that builds upon the Sinkhorn algorithm for solving the entropic regularized multimarginal optimal transport. We demonstrate that the ApproxMPOT algorithm can approximate the optimal value of multimarginal POT problem with a computational complexity upper bound of the order $\tilde{\mathcal{O}}(m^3(n+1)^{m}/ \varepsilon^2)$ where $\varepsilon > 0$ stands for the desired tolerance.
Submission history
From: Khang Le [view email][v1] Wed, 18 Aug 2021 06:46:59 UTC (463 KB)
[v2] Thu, 24 Feb 2022 06:18:20 UTC (935 KB)
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