def _annotator(self, ann_id):
        return self.DEFAULT_ANNOTATOR_ID if ann_id is None else ann_id
Check parallel regression.
dataset/ETHPy150Open dossier/dossier.web/dossier/web/label_folders.py/Folders._annotator--crossover with--dataset/ETHPy150Open scikit-learn/scikit-learn/sklearn/ensemble/tests/test_iforest.py/test_iforest_parallel_regression