def get_item_at(self, index):
        raise NotImplementedError
The main method of this class. It runs the crossvalidation process
dataset/ETHPy150Open enthought/pyface/pyface/list_box_model.py/ListBoxModel.get_item_at--crossover with--dataset/ETHPy150Open pybrain/pybrain/pybrain/tools/validation.py/CrossValidator.validate