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arXiv 1804.04791stat.MLcs.LG
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鲁棒PCA的快速无参数离群点识别

Fast, Parameter free Outlier Identification for Robust PCA

Indian Institute of Technology Madras(印度理工学院马德拉斯分校)

Vishnu Menon, Sheetal Kalyani

摘要:

鲁棒主成分分析(Robust PCA),即存在离群值的主成分分析问题,近年来得到了广泛的研究。在这里,我们专注于列稀疏离群模型中的鲁棒PCA。现有的列稀疏离群模型的方法要么假设知道系统中低维子空间的维数,要么假设知道系统中离群点的比例。然而,在许多应用中,这些参数的知识是不可用的。受此启发,我们提出了一种无参数的鲁棒PCA离群点识别方法,该方法a)不需要离群点分数的知识,b)不需要底层子空间的维数的知识,c)计算简单且快速。此外,分析保证导出离群值识别和算法的性能与现有的最先进的方法。

英文摘要:

Robust PCA, the problem of PCA in the presence of outliers has been extensively investigated in the last few years. Here we focus on Robust PCA in the column sparse outlier model. The existing methods for column sparse outlier model assumes either the knowledge of the dimension of the lower dimensional subspace or the fraction of outliers in the system. However in many applications knowledge of these parameters is not available. Motivated by this we propose a parameter free outlier identification method for robust PCA which a) does not require the knowledge of outlier fraction, b) does not require the knowledge of the dimension of the underlying subspace, c) is computationally simple and fast. Further, analytical guarantees are derived for outlier identification and the performance of the algorithm is compared with the existing state of the art methods.

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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