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arXiv 1105.0540stat.MLcs.LG
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修剪最近邻聚类树

Pruning nearest neighbor cluster trees

Max Planck Institute for Intelligent Systems(马克斯·普朗克智能系统研究所)

Samory Kpotufe, Ulrike von Luxburg

摘要:

最近邻(k-NN)图被广泛用于机器学习和数据挖掘应用中,我们的目标是更好地理解它们揭示了未知的底层点分布的聚类结构。此外,是否有可能确定由于抽样变异性而可能出现的虚假结构?我们的第一个贡献是一个统计分析,揭示了如何某些子图的k-近邻图形成一个相合估计量的聚类树的基本分布点。我们的第二个也可能是最重要的贡献是以下有限样本保证。我们仔细制定了积极和保守的修剪之间的权衡,并能够保证删除所有虚假的集群结构在所有级别的树,而在同一时间保证恢复显着的集群。这是聚类上下文中的第一个这样的有限样本结果。

英文摘要:

Nearest neighbor (k-NN) graphs are widely used in machine learning and data mining applications, and our aim is to better understand what they reveal about the cluster structure of the unknown underlying distribution of points. Moreover, is it possible to identify spurious structures that might arise due to sampling variability? Our first contribution is a statistical analysis that reveals how certain subgraphs of a k-NN graph form a consistent estimator of the cluster tree of the underlying distribution of points. Our second and perhaps most important contribution is the following finite sample guarantee. We carefully work out the tradeoff between aggressive and conservative pruning and are able to guarantee the removal of all spurious cluster structures at all levels of the tree while at the same time guaranteeing the recovery of salient clusters. This is the first such finite sample result in the context of clustering.

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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