2013/8/29 Will Buckner <wbuck...@beatsmusic.com>: > Er, it looks like safe_sparse_dot() returns sparse unless dense_output=True.
No, it returns dense output when one of its two arguments is dense. dense_output only exists to force dense output in the sparse-sparse case. safe_sparse_norm(X - safe_sparse_dot(W, H)) would not work because sparse matrices don't support subtraction, but this should be close to something that might work (thinking out loud): W, H = csr_matrix(H), csr_matrix(W) reconstruction_err = euclidean_distances(X, W * H).sum() W * H is now a sparse × sparse → sparse matrix multiplication. Unfortunately, only of the tests seems to fail when I try this. -- Lars Buitinck Scientific programmer, ILPS University of Amsterdam ------------------------------------------------------------------------------ Learn the latest--Visual Studio 2012, SharePoint 2013, SQL 2012, more! Discover the easy way to master current and previous Microsoft technologies and advance your career. Get an incredible 1,500+ hours of step-by-step tutorial videos with LearnDevNow. Subscribe today and save! http://pubads.g.doubleclick.net/gampad/clk?id=58040911&iu=/4140/ostg.clktrk _______________________________________________ Scikit-learn-general mailing list Scikit-learn-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
