def get_fixed_var_descr(self, model, data):
        self.get_data_specs(model)[0].validate(data)
        fixed_var_descr = FixedVarDescr()
        return fixed_var_descr
Subclasses should override this if they need variables held
dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/costs/cost.py/Cost.get_fixed_var_descr