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 implementation of splitWithProportionchanged between PyBrain versions 0.3.2 and 0.3.3., introducing this bug that breaks polymorphism.
As of now, the library hasn't been updated since January 2015, so using some kind of workaround is the only course of action at the moment.

You can check the responsible commit here: https://github.com/pybrain/pybrain/commit/2f02b8d9e4e9d6edbc135a355ab387048a00f1af