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arXiv 1601.04586stat.MEcs.LGstat.ML
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稀疏凸聚类

Sparse Convex Clustering

New York University School of Medicine(纽约大学医学院);Merck Research Laboratories(默克研究实验室);University of Miami School of Business Administration(迈阿密大学工商管理学院);New Jersey Institute of Technology(新泽西理工学院)

Binhuan Wang, Yilong Zhang, Will Wei Sun, Yixin Fang

摘要:

凸聚类是k-均值聚类和层次聚类的一种凸松弛算法,它很好地解决了传统非凸聚类方法的不稳定性问题。虽然它的计算和统计特性最近已被研究,凸聚类的性能尚未在高维聚类的情况下,其中的数据包含大量的功能和他们中的许多人进行没有信息的聚类结构进行了研究。在本文中,我们证明了凸聚类的性能可能会扭曲时,无信息的功能,包括在聚类。为了克服它,我们引入了一种新的聚类方法,称为稀疏凸聚类,同时聚类观察和进行特征选择。其核心思想是用正则化的形式来表示凸聚类,并在聚类中心处引入自适应的组套索惩罚项。为了最佳地平衡聚类拟合和稀疏性之间的权衡,开发了基于聚类稳定性的调整标准。在理论上,我们提供了一个无偏估计量的自由度的建议稀疏凸聚类方法。最后,稀疏凸聚类的有效性进行了检查,通过各种数值实验和实际数据的应用。

英文摘要:

Convex clustering, a convex relaxation of k-means clustering and hierarchical clustering, has drawn recent attentions since it nicely addresses the instability issue of traditional nonconvex clustering methods. Although its computational and statistical properties have been recently studied, the performance of convex clustering has not yet been investigated in the high-dimensional clustering scenario, where the data contains a large number of features and many of them carry no information about the clustering structure. In this paper, we demonstrate that the performance of convex clustering could be distorted when the uninformative features are included in the clustering. To overcome it, we introduce a new clustering method, referred to as Sparse Convex Clustering, to simultaneously cluster observations and conduct feature selection. The key idea is to formulate convex clustering in a form of regularization, with an adaptive group-lasso penalty term on cluster centers. In order to optimally balance the tradeoff between the cluster fitting and sparsity, a tuning criterion based on clustering stability is developed. In theory, we provide an unbiased estimator for the degrees of freedom of the proposed sparse convex clustering method. Finally, the effectiveness of the sparse convex clustering is examined through a variety of numerical experiments and a real data application.

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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