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Is it necessary to normalize a training data for KPCA?

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K M Ibrahim Khalilullah
编辑： K M Ibrahim Khalilullah 2017-12-5
I download some code from matlab file exchange. But nobody ensures about the data normalization that the data has zero-mean(approximately). The link to the code of matlab file exchange is here: https://www.mathworks.com/matlabcentral/fileexchange/39715-kernel-pca-and-pre-image-reconstruction

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