Re: [Scikit-learn-general] Question about the FactorAnalysis implementation

2014-12-05 Thread Sturla Molden
João Felipe Santos wrote: > To give this a bit of context, I implemented Barber’s algorithm in Julia > and used the scikit-learn implementation to check my results (and also to > get hints for fixing numerical instability issues). I think the main > source of confusion here was that both in stand

Re: [Scikit-learn-general] Question about the FactorAnalysis implementation

2014-12-05 Thread João Felipe Santos
Hi Michael and Kyle, thanks to you both for the fast replies! (and Kyle, nice to see you here too!) To give this a bit of context, I implemented Barber’s algorithm in Julia and used the scikit-learn implementation to check my results (and also to get hints for fixing numerical instability iss

Re: [Scikit-learn-general] Question about the FactorAnalysis implementation

2014-12-05 Thread Kyle Kastner
I haven't looked closely, but is Barber's data format considered to be examples as columns, or examples as rows? That difference is usually what I see in a bunch of different SVD based algorithms. It is very annoying when reading the literature. aka. what Michael said On Fri, Dec 5, 2014 at 10:2

Re: [Scikit-learn-general] Question about the FactorAnalysis implementation

2014-12-05 Thread Michael Eickenberg
I am not sure if this is the exact issue here, but note that data in sklearn is represented row-wise: One data point per row. This means that the feature names are indicated by the columns. Now, after SVD, U is a matrix that lives in sample space and VT is a matrix that lives in feature space. The