Whether the estimator fails to provide a “reasonable” test-set score, which currently for classification is an accuracy of 0.83 on make_blobs(n_samples=300, random_state=0). The datasets and values are based on current estimators in scikit-learn and might be replaced by something more systematic.
multi_classbool, default=True
Whether the classifier can handle multi-class classification. Note that all classifiers support binary classification. Therefore this flag indicates whether the classifier is a binary-classifier-only or not.