AttributeError using pyBrain _splitWithPortion - object type changed?

Question

I\'m testing out pybrain following the basic classification tutorial here and a different take on it with some more realistic data here. However I receive this error when applyi

Answer 1

The simplest workaround that I found was to do first the splitWithProportion(), update the number of classes and then do the _convertToOneOfMany().

tstdata, trndata = alldata.splitWithProportion( 0.25 )
tstdata.nClasses = alldata.nClasses
trndata.nClasses = alldata.nClasses
tstdata._convertToOneOfMany(bounds=[0, 1])
trndata._convertToOneOfMany(bounds=[0, 1])

And with the update of nClasses of both testdata and trndata, it is guarantee that you don't get different dimensions in the target fields.

I was geting errors either if I did first _convertToOneOfMany and second splitWithProportion or the other way around when working with a ClassificationDataSet. So, I suggested and update in the splitWithProportion function. You can see the whole code in this pullRequest.