[pymvpa] Searchlights and additional measures

Yaroslav Halchenko debian at onerussian.com
Wed Aug 19 03:08:39 UTC 2009

> I am new to PyMVPA, but so far I am really enjoying it.
Glad to hear it! Especially since you are coming with concrete questions
on somewhat novel usecases, not with bug reports that something crashed
upon you ;)

> (2) Construct confusion matrix for each searchlight and save them all.
> (3) Save averaged (across the folds) SVM weights for all of the searchlights.
I could only wonder what you would do with those ;) but yeah -- we don't
have such functionality available "out of the box".

But there are 2 possible ways "to accomplish the mission"

#1 with our intervention: adjust searchlight's __call__ to provide
callbacks to your custom function or similar harvest_attribs,
which would simply collect anything you like from results of running cv
on each sphere

#2 without our intervention: just look at the code of searchlight -- it
is very very short and self-explanatory. So, you could craft that loop
yourself by simply copy/pasting it and extending the way you like (can't
resist giving  a pride to benefits of scripting and open-source)

I guess, in the long run, #1 is preferable, but #2 could be the faster
track for you just to get the job done.

P.S. to look at the code of searchlight, if you use ipython, the
simplest way is to call


Let us know if we should proceed with #1 ;)

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