def items_count(self):
        return self._item_ids.size
A fake cost that we differentiate symbolically to derive the SML
dataset/ETHPy150Open muricoca/crab/scikits/crab/models/classes.py/MatrixPreferenceDataModel.items_count--crossover with--dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/costs/ebm_estimation.py/SML._cost