Minimum cost flows, MDPs, and ℓ1-regression in nearly linear time for dense instances
Minimum cost flows, MDPs, and ℓ1-regression in nearly linear time for dense instances
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密集实例的近线性时间内的最小成本流、MDP 和 ℓ1 回归
DOI:
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Di Wang
中科院分区:
文献类型:
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作者:
Jan van den Brand;Yin Tat Lee;Yang P. Liu;Thatchaphol Saranurak;Aaron Sidford;Zhao Song;Di Wang
In this paper we provide new randomized algorithms with improved runtimes for solving linear programs with two-sided constraints. In the special case of the minimum cost flow problem on n-vertex m-edge graphs with integer polynomially-bounded costs and capacities we obtain a randomized method which solves the problem in Õ(m + n1.5) time. This improves upon the previous best runtime of Õ(m √n) [Lee-Sidford’14] and, in the special case of unit-capacity maximum flow, improves upon the previous best runtimes of m4/3 + o(1) [Liu-Sidford’20, Kathuria’20] and Õ(m √n) [Lee-Sidford’14] for sufficiently dense graphs. In the case of ℓ1-regression in a matrix with n-columns and m-rows we obtain a randomized method which computes an є-approximate solution in Õ(mn + n2.5) time. This yields a randomized method which computes an є-optimal policy of a discounted Markov Decision Process with S states and, A actions per state in time Õ(S2 A + S2.5). These methods improve upon the previous best runtimes of methods which depend polylogarithmically on problem parameters, which were Õ(mn1.5) [Lee-Sidford’15] and Õ(S2.5 A) [Lee-Sidford’14, Sidford-Wang-Wu-Ye’18] respectively. To obtain this result we introduce two new algorithmic tools of possible independent interest. First, we design a new general interior point method for solving linear programs with two sided constraints which combines techniques from [Lee-Song-Zhang’19, Brand et al.’20] to obtain a robust stochastic method with iteration count nearly the square root of the smaller dimension. Second, to implement this method we provide dynamic data structures for efficiently maintaining approximations to variants of Lewis-weights, a fundamental importance measure for matrices which generalize leverage scores and effective resistances.
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DOI:
10.1109/focs46700.2020.00090
发表时间:
2020
期刊:
2020
影响因子:
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作者:
van den Brand, Jan;Lee, Yin-Tat;Nanongkai, Danupon;Peng, Richard;Saranurak, Thatchaphol;Sidford, Aaron;Song, Zhao;Wang, Di
通讯作者:
Wang, Di
DOI:
10.1287/opre.2023.2451
发表时间:
2020-05
期刊:
Oper. Res.
影响因子:
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作者:
Gen Li;Yuting Wei;Yuejie Chi;Yuantao Gu;Yuxin Chen
通讯作者:
Gen Li;Yuting Wei;Yuejie Chi;Yuantao Gu;Yuxin Chen
DOI:
10.1145/3357713.3384247
发表时间:
2019-10
期刊:
Proceedings of the 52nd Annual ACM SIGACT Symposium on Theory of Computing
影响因子:
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作者:
Yang P. Liu;Aaron Sidford
通讯作者:
Yang P. Liu;Aaron Sidford
DOI:
10.4230/lipics.icalp.2022.20
发表时间:
2020-04
期刊:
ArXiv
影响因子:
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作者:
A. Bernstein;Jan van den Brand;M. Gutenberg;Danupon Nanongkai;Thatchaphol Saranurak;Aaron Sidford;He Sun
通讯作者:
A. Bernstein;Jan van den Brand;M. Gutenberg;Danupon Nanongkai;Thatchaphol Saranurak;Aaron Sidford;He Sun
DOI:
10.1109/focs46700.2020.00018
发表时间:
2020-03
期刊:
2020 IEEE 61st Annual Symposium on Foundations of Computer Science (FOCS)
影响因子:
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作者:
Kyriakos Axiotis;Aleksander Mkadry;Adrian Vladu
通讯作者:
Kyriakos Axiotis;Aleksander Mkadry;Adrian Vladu