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arXiv 2302.11151cs.DScs.CG
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面向容量与公平性约束聚类的改进 Coreset

Improved Coresets for Clustering with Capacity and Fairness Constraints

Lingxiao Huang, Pinyan Lu, Xuan Wu

AI总结:

本文提出近线性时间 coreset 构造算法,通过自适应环采样和有效中心几何分析,显著改进容量与公平约束 (k,z)-聚类的 coreset 规模界。

摘要:

我们研究带容量与公平性约束聚类的 coreset。主要结果是一种近线性时间算法,可为容量约束 (k,z)-聚类构造大小为 $\tilde{O}(k^2\varepsilon^{-2z-2})$ 的 $\varepsilon$-coreset,改进了 [BCAJ+22, HJLW23] 近期给出的 $\tilde{O}(k^3\varepsilon^{-3z-2})$ 界。作为推论,与他们相比,我们还在公平 (k,z)-聚类的 coreset 大小上节省了因子 $k\varepsilon^{-z}$。我们从根本上改进了 [BCAJ+22] 的分层均匀采样框架:在每个环实例上自适应选择样本量,并使其与该实例相对于最优解的聚类成本成比例。我们的分析依赖一个关键几何观察:通过能够“忽略”距离环中心过远或过近的所有中心点,将总“有效中心”数量从 [BCAJ+22] 的 $\tilde{O}(k^2\varepsilon^{-z})$ 降至仅 $O(k\log \varepsilon^{-1})$。

英文摘要:

We study coresets for clustering with capacity and fairness constraints. Our main result is a near-linear time algorithm to construct $\tilde{O}(k^2\varepsilon^{-2z-2})$-sized $\varepsilon$-coresets for capacitated $(k,z)$-clustering which improves a recent $\tilde{O}(k^3\varepsilon^{-3z-2})$ bound by [BCAJ+22, HJLW23]. As a corollary, we also save a factor of $k \varepsilon^{-z}$ on the coreset size for fair $(k,z)$-clustering compared to them. We fundamentally improve the hierarchical uniform sampling framework of [BCAJ+22] by adaptively selecting sample size on each ring instance, proportional to its clustering cost to an optimal solution. Our analysis relies on a key geometric observation that reduces the number of total ``effective centers" from [BCAJ+22]'s $\tilde{O}(k^2\varepsilon^{-z})$ to merely $O(k\log \varepsilon^{-1})$ by being able to ``ignore'' all center points that are too far or too close to the ring center.

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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