Re: [Scikit-learn-general] PCA and SPCA nipals

2014-05-29 Thread bthirion
Dear Luca, In terms of efficiency, do you think that nipals outperforms the RandomizedPCA ? I'm not an expert in these methods, but it sounds like they rely on similar tricks. My suggestion would be to run a benchmark on some dataset of the scikit to compare the accurcay/computat

[Scikit-learn-general] PCA and SPCA nipals

2014-05-28 Thread Luca Puggini
Hi, I was looking to the PCA and SparsePCA implementation of sklearn. They are both based on SVD but I think that the nipals implementation of the same algorithm can really increase the speed in some situations. In particular with sparse PCA we usually use a small number of components and so its s