Method fit

sklearn/utils/tests/test_validation.py:933–935

(self, **kwargs)

def test_check_is_fitted_with_is_fitted():
    class Estimator(BaseEstimator):
        def fit(self, **kwargs):
            self._is_fitted = True
            return self

        def __sklearn_is_fitted__(self):
            return hasattr(self, "_is_fitted") and self._is_fitted