Clicker Questions MT 1

A you would get an approximation to the zero meaned

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Unformatted text preview: hat would happen if you used all D eigenvectors ? A) You would get an approximation to the zero-meaned pattern B) You would perfectly reconstruct the zero-meaned pattern 5 Clicker K-means code 6 IN THE FOLLOWING CODE SNIPPET Why is the LAST line needed %%%% faces are stored as COLUMNS in the matrix faces facesz=faces-repmat(meanface,1,48); [Vp, Dp]=eig(facesz’*facesz); %%% sort them in order of decreasing eigenvalues [V,D]=eigsort(Vp,Dp); %%% This is the second part of the trick -- make sure you understand w %%% this is necessary. U=facesz*V; A) To normalize the eigenfaces B) Because V are the eigenvectors of Z’Z not ZZ’ Remember to get the eigenvectors of ZZ’ you take the eigenvectors of Z’Z and multiply (on the left by Z) Clicker question 1) Which of these options will be the NEXT step With this starting configuration: A) B) C) D) 7 Clicker question 2) Which of these options will be the NEXT step With this starting configuration: A) B) C) D) 8 PCA of natural images PCA of aligned f...
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