@staticmethod
def _get_data_multiplier(solution, dmu_code, category):
    """ Helper method that is used for writing weighted data
            to a given output.

            Args:
                solution (Solution): solution.
                dmu_code (str): DMU code.
                category (str): category name.

            Returns:
                int: a scale value to scale weights.
        """
    return solution._input_data.coefficients[dmu_code, category]
