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arXiv 1602.05563stat.ML
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再生核Hilbert空间中抗核方法的核(互)协方差算子

Robust Kernel (Cross-) Covariance Operators in Reproducing Kernel Hilbert Space toward Kernel Methods

Md. Ashad Alam, Kenji Fukumizu, Yu-Ping Wang

摘要:

据我们所知,统计无监督学习还没有普遍的有充分依据的鲁棒方法。大多数无监督方法显式或隐式地依赖于核协方差算子(核CO)或核互协方差算子(核CCO)。他们是敏感的污染数据,即使使用有界正定核。首先,我们提出了鲁棒核协方差算子(鲁棒核CO)和鲁棒核互协方差算子(鲁棒核CCO)的基础上,而不是二次损失函数的广义损失函数。其次,提出了经典核典型相关分析的影响函数。第三,使用这个影响函数,我们提出了一个可视化的方法来检测两组数据的有影响力的意见。最后,我们提出了一种基于鲁棒核CO和鲁棒核CCO的方法,称为鲁棒核CCA,它是针对污染数据而设计的,对噪声的敏感性低于经典的核CCA。我们描述的原则也适用于许多必须处理内核CO或内核CCO问题的核方法。合成和成像遗传学分析的实验表明,所提出的可视化和鲁棒的核CCA可以有效地应用于理想数据和污染数据。鲁棒方法显示出优于最先进方法的性能。

英文摘要:

To the best of our knowledge, there are no general well-founded robust methods for statistical unsupervised learning. Most of the unsupervised methods explicitly or implicitly depend on the kernel covariance operator (kernel CO) or kernel cross-covariance operator (kernel CCO). They are sensitive to contaminated data, even when using bounded positive definite kernels. First, we propose robust kernel covariance operator (robust kernel CO) and robust kernel crosscovariance operator (robust kernel CCO) based on a generalized loss function instead of the quadratic loss function. Second, we propose influence function of classical kernel canonical correlation analysis (classical kernel CCA). Third, using this influence function, we propose a visualization method to detect influential observations from two sets of data. Finally, we propose a method based on robust kernel CO and robust kernel CCO, called robust kernel CCA, which is designed for contaminated data and less sensitive to noise than classical kernel CCA. The principles we describe also apply to many kernel methods which must deal with the issue of kernel CO or kernel CCO. Experiments on synthesized and imaging genetics analysis demonstrate that the proposed visualization and robust kernel CCA can be applied effectively to both ideal data and contaminated data. The robust methods show the superior performance over the 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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