Warning class used if there is an error while fitting the estimator.
This Warning is used in meta estimators GridSearchCV and RandomizedSearchCV and the cross-validation helper function cross_val_score to warn when there is an error while fitting the estimator.
Changed in version 0.18: Moved from sklearn.cross_validation.
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https://scikit-learn.org/1.6/modules/generated/sklearn.exceptions.FitFailedWarning.html