[pymvpa] No samples of a class in a chunk

[Jan Derrfuss]

Hello,

I would like to run an exploratory analysis where the presence of 
samples in the chunks was not under experimental control. As a result, 
there are chunks where only one of the two target classes I'm decoding 
is present in the chunk the classifier is tested on (there is also a 
single chunk in one subject where neither of the two classes is 
present). I'm running a searchlight analysis with 6-fold 
cross-validation, use a linear SVM, and compute the mean true positive rate.

Is there a preferred way to deal with such a situation?

Jan

PS. The temperature here in the Lower Rhine region is currently 33 °C 
(91 °F). Wherever you are, I hope it's colder there! :-)