def METHOD_NAME(self, base_model_names):
    if self.problem_type in [MULTICLASS, SOFTCLASS]:
        stack_columns = [model_name + "_" + str(cls) for model_name in base_model_names for cls in range(self.num_classes)]
    elif self.problem_type == QUANTILE:
        stack_columns = [model_name + "_" + str(q) for model_name in base_model_names for q in self.quantile_levels]
    else:
        stack_columns = base_model_names
    return stack_columns