On 7-Jun-09, at 6:12 AM, Gael Varoquaux wrote: > Well, I do bootstrapping of PCAs, that is SVDs. I can tell you, it > makes > a big difference, especially since I have 8 cores. Just curious Gael: how many PC's are you retaining? Have you tried iterative methods (i.e. the EM algorithm for PCA)? David