Approximating Nash Social Welfare by Matching and Local Search
Approximating Nash Social Welfare by Matching and Local Search
复制标题
通过匹配和本地搜索近似纳什社会福利
DOI:
10.1145/3564246.3585255
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Vondrák, Jan
中科院分区:
文献类型:
--
作者:
Garg, Jugal;Husić, Edin;Li, Wenzheng;Végh, László A.;Vondrák, Jan
For any >0, we give a simple, deterministic (4+)-approximation algorithm for the Nash social welfare (NSW) problem under submodular valuations. The previous best approximation factor was 380 via a randomized algorithm. We also consider the asymmetric variant of the problem, where the objective is to maximize the weighted geometric mean of agents’ valuations, and give an (ω + 2 + ) -approximation if the ratio between the largest weight and the average weight is at most ω.We also show that the 12-EFX envy-freeness property can be attained simultaneously with a constant-factor approximation. More precisely, we can find an allocation in polynomial time which is both 12-EFX and a (8+)-approximation to the symmetric NSW problem under submodular valuations. The previous best approximation factor under 12-EFX was linear in the number of agents.
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DOI:
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期刊:
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DOI:
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