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• W2071570209 abstract "In kernel methods, choosing a suitable kernel is indispensable for favorable results. No well-founded methods, however, have been established in general for unsupervised learning. We focus on kernel Principal Component Analysis (kernel PCA), which is a nonlinear extension of principal component analysis and has been used electively for extracting nonlinear features and reducing dimensionality. As a kernel method, kernel PCA also suffers from the problem of kernel choice. Although cross-validation is a popular method for choosing hyperparameters, it is not applicable straightforwardly to choose a kernel in kernel PCA because of the incomparable norms given by different kernels. It is important, thus, to develop a well-founded method for choosing a kernel in kernel PCA. This study proposes a method for choosing hyperparameters in kernel PCA (kernel and the number of components) based on cross-validation for the comparable reconstruction errors of pre-images in the original space. The experimental results on synthesized and real-world datasets demonstrate that the proposed method successfully selects an appropriate kernel and the number of components in kernel PCA in terms of visualization and classification errors on the principal components. The results imply that the proposed method enables automatic design of hyperparameters in kernel PCA." @default.
• W2071570209 created "2016-06-24" @default.
• W2071570209 creator A5012922872 @default.
• W2071570209 creator A5049423717 @default.
• W2071570209 date "2014-07-01" @default.
• W2071570209 modified "2023-10-18" @default.
• W2071570209 title "HYPERPARAMETER SELECTION IN KERNEL PRINCIPAL COMPONENT ANALYSIS" @default.
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• W2071570209 doi "https://doi.org/10.3844/jcssp.2014.1139.1150" @default.
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