[Pkg-exppsy-pymvpa] New splitter?

Per B. Sederberg persed at princeton.edu
Mon Apr 21 15:59:14 UTC 2008

Howdy Michael:

I having a little trouble with the new splitter.  I think everything
is there to do what I'd like, but I can't figure it out based on the
Splitter code.

I have a custom dataset attribute called tasks and each TR's task is
set to be 0,1, or 2 depending on what task the participant was
performing at that time.  I'd like to return a single split of the
data, training on the 0 and 1 tasks and testing on the 2 task.  I'd
also like to ensure that the same number of each task are in the
training dataset, but I don't care about the testing dataset.

I think I have almost what I want with the following custom splitter:


However, it looks like the nperlabel is getting applied to both the
training and the testing samples.  The old splitter allowed you to
apply this separately for the first and second samples via
nfirstsamples and nsecondsamples, but it looks like this functionality
was removed with the latest other improvements, which are totally
awesome, BTW.

Thanks for any pointers,

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