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arXiv 2103.02512cs.DScs.LGstat.ML
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社会公平聚类的近似算法

Approximation Algorithms for Socially Fair Clustering

Toyota Technological Institute at Chicago(芝加哥丰田技术研究院)

Yury Makarychev, Ali Vakilian

摘要:

我们提出了一个$(e^{O(p)} \frac{\log \ell}{\log\log\ell})$近似算法的社会公平的聚类与$\ell_p$目标。在这个问题中,我们给出了度量空间中的一组点。每个点属于一个(或多个)$\ell$组。我们的目标是找到一个$k$ -medians、$k$ -means或更一般的$\ell_p$ -clustering,它同时适合所有组。更准确地说,我们需要找到一组$k$中心$C$,以便最小化$\sum_{u \text{ in group }j} d(u,C)^p$的所有组$j$上的最大值。社会公平聚类问题由Ghadiri,Samadi和Vempala [2021]以及Abbasi,Bhaskara和Venkatasubramanian [2021]独立提出。我们的算法改进和推广了他们的$O(\ell)$ -近似算法的问题。该问题的自然LP松弛具有$Ω(\ell)$的完整性间隙。为了得到我们的结果,我们引入了一个加强的LP松弛,并表明它有一个完整性间隙$Θ(\frac{\log \ell}{\log\log\ell})$固定的$p$。此外,我们提出了一种双标准逼近算法,该算法推广了Abbasi等人[2021]的双标准逼近。

英文摘要:

We present an $(e^{O(p)} \frac{\log \ell}{\log\log\ell})$-approximation algorithm for socially fair clustering with the $\ell_p$-objective. In this problem, we are given a set of points in a metric space. Each point belongs to one (or several) of $\ell$ groups. The goal is to find a $k$-medians, $k$-means, or, more generally, $\ell_p$-clustering that is simultaneously good for all of the groups. More precisely, we need to find a set of $k$ centers $C$ so as to minimize the maximum over all groups $j$ of $\sum_{u \text{ in group }j} d(u,C)^p$. The socially fair clustering problem was independently proposed by Ghadiri, Samadi, and Vempala [2021] and Abbasi, Bhaskara, and Venkatasubramanian [2021]. Our algorithm improves and generalizes their $O(\ell)$-approximation algorithms for the problem. The natural LP relaxation for the problem has an integrality gap of $Ω(\ell)$. In order to obtain our result, we introduce a strengthened LP relaxation and show that it has an integrality gap of $Θ(\frac{\log \ell}{\log\log\ell})$ for a fixed $p$. Additionally, we present a bicriteria approximation algorithm, which generalizes the bicriteria approximation of Abbasi et al. [2021].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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