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Kris Villez

Purdue University

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04 Apr 2013 Kernel PCA and Pre-Image Reconstruction standard PCA, Gaussian kernel PCA, polynomial kernel PCA, pre-image reconstruction Author: Quan Wang

Dear Quan Wang,

Thanks for sharing your code. However, I am not able to reproduce the results displayed in Figure 3 and 4 of your paper.

For Figure 3, it is not clear what the order of the applied polynomial is.

For Figure 4, the two features are highly correlated while the should in fact be uncorrelated. I wondered if this is a mistake in the paper or in the code.

Thanks for your comments,

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