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• W2898066105 abstract "In this work, we provide faster algorithms for approximating the optimal transport distance, e.g. earth mover's distance, between two discrete probability distributions $mu, nu in Delta^n$. Given a cost function $C : [n] times [n] to mathbb{R}_{geq 0}$ where $C(i,j) leq 1$ quantifies the penalty of transporting a unit of mass from $i$ to $j$, we show how to compute a coupling $X$ between $r$ and $c$ in time $widetilde{O}left(n^2 /epsilon right)$ whose expected transportation cost is within an additive $epsilon$ of optimal. This improves upon the previously best known running time for this problem of $widetilde{O}left(text{min}left{ n^{9/4}/epsilon, n^2/epsilon^2 right}right)$. We achieve our results by providing reductions from optimal transport to canonical optimization problems for which recent algorithmic efforts have provided nearly-linear time algorithms. Leveraging nearly linear time algorithms for solving packing linear programs and for solving the matrix balancing problem, we obtain two separate proofs of our stated running time. Further, one of our algorithms is easily parallelized and can be implemented with depth $widetilde{O}(1/epsilon)$. Moreover, we show that further algorithmic improvements to our result would be surprising in the sense that any improvement would yield an $o(n^{2.5})$ algorithm for textit{maximum cardinality bipartite matching}, for which currently the only known algorithms for achieving such a result are based on fast-matrix multiplication." @default.
• W2898066105 created "2018-10-26" @default.
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• W2898066105 date "2018-10-17" @default.
• W2898066105 modified "2023-09-27" @default.
• W2898066105 title "Towards Optimal Running Times for Optimal Transport" @default.
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• W2898066105 hasPublicationYear "2018" @default.
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