def _clean(self, label_value: str) -> str:
    if self.clean_up_labels:
        return label_value.replace('_', ' ')
    else:
        return label_value
def _clean(self, label_value: str) -> str:
    if self.clean_up_labels:
        return label_value.replace('_', ' ')
    else:
        return label_value