def alts_columns_used(self):
        return list(tz.unique(tz.concatv(
            util.columns_in_filters(self.alts_predict_filters),
            util.columns_in_filters(self.alts_fit_filters))))
Columns from the alternatives table that are used for filtering.
dataset/ETHPy150Open UDST/urbansim/urbansim/models/dcm.py/MNLDiscreteChoiceModel.alts_columns_used