[pymvpa] Saturation in SOM

[Michael Hanke]

Hey,

On Mon, Dec 23, 2013 at 03:39:12PM -0200, Felipe Duque wrote:
> Hello. I've used SOM in MVPA2 for some academic works before and have never
> run into any kind of trouble. However, in my most recent work, I'm running
> into overflow issues. My input data is [0, 1] normalized.
> 
> Delving into som.py code, I'm afraid I didn't notice any kind of
> 'forgetting' term in the training methods. Is this so? Why is this
> saturation taking place?

I am not 100% sure what kind of issue you are seeing. Numerical
overflow? The SOM code is pretty simplistic -- once we know what the
issue is, it should be possible to determine its origin.

Do you maybe have some demo data and code to reproduce the problem?

Michael

-- 
Michael Hanke
http://mih.voxindeserto.de