论文标题

通用彩色$ k $中心问题的技术

Techniques for Generalized Colorful $k$-Center Problems

论文作者

Anegg, Georg, Koch, Laura Vargas, Zenklusen, Rico

论文摘要

公平的聚类最近引起了人们的兴趣。将公平方面整合到经典聚类问题中的一种吸引人的方式是引入多个覆盖约束。这是对稳健(或离群)设置的自然概括,该设置已被广泛研究,并且适合各种经典的算法技术。相比之下,对于多个覆盖限制(所谓的彩色设置)的情况,最近才针对$ k $ center聚类变体开发了专业技术,这也是本文的重点。虽然先前的技术假设涵盖了对客户的限制,但它们并未解决对设施的其他限制,该设施已在非色彩设置中进行了广泛研究。 在本文中,我们提出了一个非常多功能的框架,可以通过结合Inamdar和Varadarajan的色彩丰富的$ K $中心的迭代贪婪程序中的想法,以处理色彩差异的各种限制。为了举例说明我们的框架,我们向五颜六色的Matroid供应商提供了第一个恒定的因子近似值,相对于线性的矩阵和五颜六色的knapsack供应商。在这两种情况下,我们都很容易获得$ O(2^γ)$ - 近似。 此外,对于五颜六色的背包供应商,我们表明,只要$γ= o(1)$,就可以获得独立于颜色$γ$的恒定近似保证,这是获得多项式运行时间所需的。更确切地说,我们通过扩展了Jia,Sheth和Svensson最近推出的彩色$ K $中心的技术来获得7美元的AppRximation。

Fair clustering enjoyed a surge of interest recently. One appealing way of integrating fairness aspects into classical clustering problems is by introducing multiple covering constraints. This is a natural generalization of the robust (or outlier) setting, which has been studied extensively and is amenable to a variety of classic algorithmic techniques. In contrast, for the case of multiple covering constraints (the so-called colorful setting), specialized techniques have only been developed recently for $k$-Center clustering variants, which is also the focus of this paper. While prior techniques assume covering constraints on the clients, they do not address additional constraints on the facilities, which has been extensively studied in non-colorful settings. In this paper, we present a quite versatile framework to deal with various constraints on the facilities in the colorful setting, by combining ideas from the iterative greedy procedure for Colorful $k$-Center by Inamdar and Varadarajan with new ingredients. To exemplify our framework, we show how it leads, for a constant number $γ$ of colors, to the first constant-factor approximations for both Colorful Matroid Supplier with respect to a linear matroid and Colorful Knapsack Supplier. In both cases, we readily get an $O(2^γ)$-approximation. Moreover, for Colorful Knapsack Supplier, we show that it is possible to obtain constant approximation guarantees that are independent of the number of colors $γ$, as long as $γ=O(1)$, which is needed to obtain a polynomial running time. More precisely, we obtain a $7$-approximation by extending a technique recently introduced by Jia, Sheth, and Svensson for Colorful $k$-Center.

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