Approximating Nash Social Welfare under Submodular Valuations through (Un)Matchings
Approximating Nash Social Welfare under Submodular Valuations through (Un)Matchings
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通过(非)匹配逼近子模估值下的纳什社会福利
DOI:
10.1137/1.9781611975994.163
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Kulkarni, Rucha
中科院分区:
文献类型:
--
作者:
Garg, Jugal;Kulkarni, Pooja;Kulkarni, Rucha
We study the problem of approximating maximum Nash social welfare (NSW) when allocatingmindivisible items amongnasymmetric agents with submodular valuations. The NSW is a well-established notion of fairness and efficiency, defined as the weighted geometric mean of agents’ valuations. For special cases of the problem with symmetric agents and additive(-like) valuation functions, approximation algorithms have been designed using approaches customized for these specific settings, and they fail to extend to more general settings. Hence, no approximation algorithm with a factor independent ofmwas known either for asymmetric agents with additive valuations or for symmetric agents beyond additive(-like) valuations before this work.In this article, we extend our understanding of the NSW problem to far more general settings. Our main contribution is two approximation algorithms for asymmetric agents with additive and submodular valuations. Both algorithms are simple to understand and involve non-trivial modifications of a greedy repeated matchings approach. Allocations of high-valued items are done separately by un-matching certain items and re-matching them by different processes in both algorithms. We show that these approaches achieve approximation factors ofO(n) andO(nlogn) for additive and submodular cases, independent of the number of items. For additive valuations, our algorithm outputs an allocation that also achieves the fairness property of envy-free up to one item (EF1).Furthermore, we show that the NSW problem under submodular valuations is strictly harder than all currently known settings with anfactor of the hardness of approximation, even for constantly many agents. For this case, we provide a different approximation algorithm that achieves a factor of, hence resolving it completely.
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DOI:
10.1137/1.9781611975994.167
发表时间:
2020
期刊:
Proceedings of the Annual ACMSIAM Symposium on Discrete Algorithms
影响因子:
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作者:
Davies, Sami;Rothvoss, Thomas Rothvoss;Zhang, Yihao
通讯作者:
Zhang, Yihao
DOI:
--
发表时间:
2021
期刊:
The Thirty-Fifth AAAI Conference on Artificial Intelligence (AAAI-21
影响因子:
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作者:
Chaudhury, Bhaskar Ray;Garg, Jugal;Mehta, Ruta
通讯作者:
Mehta, Ruta
DOI:
10.1007/978-3-540-74208-1_15
发表时间:
2007
期刊:
SIAM J. Appl. Algebra Geom.
影响因子:
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作者:
Subhash Khot;Ashok Kumar Ponnuswami
通讯作者:
Ashok Kumar Ponnuswami
DOI:
--
发表时间:
2016
期刊:
ACM-SIAM Symposium on Discrete Algorithms
影响因子:
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作者:
Nima Anari;Tung Mai;S. Gharan;V. Vazirani
通讯作者:
V. Vazirani
DOI:
--
发表时间:
2017
期刊:
ACM-SIAM Symposium on Discrete Algorithms
影响因子:
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作者:
J. Garg;M. Hoefer;K. Mehlhorn
通讯作者:
K. Mehlhorn