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arXiv 2209.01901cs.DS
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Coreset的均匀抽样能力

The Power of Uniform Sampling for Coresets

Vladimir Braverman, Vincent Cohen-Addad, Shaofeng H. -C. Jiang, Robert Krauthgamer, Chris Schwiegelshohn, Mads Bech Toftrup, Xuan Wu

摘要:

出于实际推广的经典$k$ -中位数和$k$ -手段的目标,如集群的大小限制,公平聚类,和Wasserstein重心,我们引入了一个元定理设计约束聚类问题的核心集。元定理减少了coreset建设的任务,一个有界数量的环的实例与一个非常宽松的添加剂错误。这种减少使我们能够使用均匀采样来构造核心集,而不是广泛使用的重要性采样,因此我们可以很容易地处理约束目标。值得注意的是,也许令人惊讶的是,这种更简单的采样方案可以产生其大小与$n$(输入点的数量)无关的核心集。我们的技术产生较小的核心集,有时是第一个核心集,大量的约束聚类问题,包括容量限制聚类,公平聚类,欧几里德Wasserstein重心,在未成年人排除图聚类,和多边形聚类下Fréchet和Hausdorff距离。最后,我们的技术也产生较小的coreset的$1$ -中位数在低维欧氏空间,特别是大小$\tilde{O}(\varepsilon^{-1.5})$在$\mathbb{R}^2$和$\tilde{O}(\varepsilon^{-1.6})$在$\mathbb{R}^3$。

英文摘要:

Motivated by practical generalizations of the classic $k$-median and $k$-means objectives, such as clustering with size constraints, fair clustering, and Wasserstein barycenter, we introduce a meta-theorem for designing coresets for constrained-clustering problems. The meta-theorem reduces the task of coreset construction to one on a bounded number of ring instances with a much-relaxed additive error. This reduction enables us to construct coresets using uniform sampling, in contrast to the widely-used importance sampling, and consequently we can easily handle constrained objectives. Notably and perhaps surprisingly, this simpler sampling scheme can yield coresets whose size is independent of $n$, the number of input points. Our technique yields smaller coresets, and sometimes the first coresets, for a large number of constrained clustering problems, including capacitated clustering, fair clustering, Euclidean Wasserstein barycenter, clustering in minor-excluded graph, and polygon clustering under Fréchet and Hausdorff distance. Finally, our technique yields also smaller coresets for $1$-median in low-dimensional Euclidean spaces, specifically of size $\tilde{O}(\varepsilon^{-1.5})$ in $\mathbb{R}^2$ and $\tilde{O}(\varepsilon^{-1.6})$ in $\mathbb{R}^3$.

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