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arXiv 2103.00558cs.LGcs.CGcs.DB
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简单均匀采样对带离群点的基于中心聚类是否有效:何时以及为何?

Is Simple Uniform Sampling Effective for Center-Based Clustering with Outliers: When and Why?

University of Science and Technology of China(中国科学技术大学);City University of Hong Kong(香港城市大学)

Jiawei Huang, Wenjie Liu, Hu Ding

AI总结:

针对带离群点的 $k$-center/median/means 聚类,提出均匀采样框架,并通过“显著性”理论说明其样本量可独立于 $n$ 与 $d$。

摘要:

现实世界数据集通常包含离群点,而离群点的存在会使聚类问题变得更具挑战性。本文提出一个简单的均匀采样框架,用于解决三类具有代表性的带离群点的基于中心聚类问题:带离群点的 $k$-center/median/means 聚类。我们的分析与以往基于采样(包括均匀和非均匀采样)的思路有根本不同。为从理论上解释均匀采样的有效性,我们引入“显著性”度量,并证明该框架的性能取决于给定实例的显著程度。特别是,若假定给定实例是“显著的”——这一假设在实践中实际上相当合理——则样本量可以独立于输入数据规模 $n$ 和维度 $d$。由于其简单性,均匀采样方法在实践中还具有若干相对于非均匀采样方法的显著优势。据我们所知,这是首个从理论与实验两方面系统研究均匀采样有效性的工作。

英文摘要:

Real-world datasets often contain outliers, and the presence of outliers can make the clustering problems to be much more challenging. In this paper, we propose a simple uniform sampling framework for solving three representative center-based clustering with outliers problems: $k$-center/median/means clustering with outliers. Our analysis is fundamentally different from the previous (uniform and non-uniform) sampling based ideas. To explain the effectiveness of uniform sampling in theory, we introduce a measure of "significance" and prove that the performance of our framework depends on the significance degree of the given instance. In particular, the sample size can be independent of the input data size $n$ and the dimensionality $d$, if we assume the given instance is "significant", which is in fact a fairly reasonable assumption in practice. Due to its simplicity, the uniform sampling approach also enjoys several significant advantages over the non-uniform sampling approaches in practice. To the best of our knowledge, this is the first work that systematically studies the effectiveness of uniform sampling from both theoretical and experimental aspects.

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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