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• W3022415429 abstract "Principal component analysis (PCA) is a widely used unsupervised method for dimensionality reduction. The kernelized version is called kernel principal component analysis (KPCA), which can capture the nonlinear data structure. KPCA is derived from the Gram matrix, which is not robust when outliers exist in the data. This may yield the principal axis in the feature space deviated by outliers, leading to misinterpretation of the principal components. In this paper, we propose a robust method for KPCA with a reformulation in Euclidean space to construct a robust KPCA method, where an error measurement is introduced into the loss function, and l 2,1-regularization is added to the loss function. The idea of l 2,1-regularization of the proposed method is motivated by sparse PCA via variable projection. However, because orthogonality is not satisfied in the proposed method, orthonormal bases are obtained by using the Gram-Schmidt orthonormalization process. In the experiments, a toy example and real data are used for outlier detection to verify the method's performance and effectiveness. In the toy example, the proposed method reduces the influence of outliers and detects more outliers than KPCA. For the real data, the proposed method improves detection in comparison to other existing methods." @default.
• W3022415429 created "2020-05-13" @default.
• W3022415429 creator A5059015629 @default.
• W3022415429 creator A5082578225 @default.
• W3022415429 date "2020-01-01" @default.
• W3022415429 modified "2023-09-24" @default.
• W3022415429 title "Robust Kernel Principal Component Analysis With ℓ_2,1-Regularized Loss Minimization" @default.
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• W3022415429 doi "https://doi.org/10.1109/access.2020.2990493" @default.
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