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            Belkin, Mikhail; Kpotufe, Samor (Ed.)We present an $$e^{O(p)} (\log \ell) / (\log \log \ell)$$-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 Abbasi, Bhaskara, and Venkatasubramanian (2021) and Ghadiri, Samadi, and Vempala (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 $$\Omega(\ell)$$. In order to obtain our result, we introduce a strengthened LP relaxation and show that it has an integrality gap of $$\Theta((\log \ell) / (\log \log \ell))$$ for a fixed p. Additionally, we present a bicriteria approximation algorithm, which generalizes the bicriteria approximation of Abbasi et al. (2021).more » « less
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