[pymvpa] hang on poly_detrend

Yaroslav Halchenko debian at onerussian.com
Thu Apr 7 16:07:51 UTC 2011

well -- probably the problem in numpy's linalg.lstsq which uses lapack's
SVD... it is very unlikely that it doesn't converge on reasonable data,
but I guess could happen... so -- do feature by feature and find on
which it gets stuck -- share the data -- lets try with different numpy
versions/lapack builds to see if it is reproducible

On Thu, 07 Apr 2011, Brian Murphy wrote:

> Hi,

> I've been using poly_detrend on a range of datasets and
> classification tasks recently, with success. But on my latest script
> it hangs, and never completes (the step that usually takes ~1s on a
> dataset of ~500 cases by ~1000 features, didn't complete after
> several hours). This only happens with a very particular set of
> parameters (certain datasets, and dimensionalities). Any suggestions
> why, or how to proceed in tracking the problem down?

> Brian

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