nd the method given by the `method` parameter. X : {array-like, sparse matrix} of shape (n_samples, n_features) The data to fit. Can be, for example a list, or an array at least 2d. y : {array-like, sparse matrix} of shape (n_samples,) or (n_samples, n_outputs), default=None The target variable to try to predict in the case of supervised learning. groups : array-like of shape (n_samples,), default=None Group labels for the samples used while splitting the dataset into train/test set. Only used in conjunction with a "Group" :term:`cv` instance (e.g., :class:`GroupKFold`). .. versionchanged:: 1.4 ``groups`` can only be passed if metadata routing is not enabled via ``sklearn.set_config(enable_metadata_routing=True)``. When routing is enabled, pass ``groups`` alongside other metadata via the ``params`` argument instead. E.g.: ``cross_val_predict(..., params={'groups': groups})``. cv : int, cross-validation generator or an iterable, default=None Determines the cross-validation splitting strategy. Possible inputs for cv are: - None, to use the default 5-fold cross validation, - int, to specify the number of folds in a `(Stratified)KFold`, - :term:`CV splitter`, - An iterable that generates (train, test) splits as arrays of indices. For int/None inputs, if the estimator is a classifier and ``y`` is either binary or multiclass, :class:`StratifiedKFold` is used. In all other cases, :class:`KFold` is used. These splitters are instantiated with `shuffle=False` so the splits will be the same across calls. Refer :ref:`User Guide ` for the various cross-validation strategies that can be used here. .. versionchanged:: 0.22 ``cv`` default value if None changed from 3-fold to 5-fold. n_jobs : int, default=None Number of jobs to run in parallel. Training the estimator and predicting are parallelized over the cross-validation splits. ``None`` means 1 unless in a :obj:`joblib.parallel_backend` context. ``-1`` means using all processors. See :term:`Glossary ` for more details. verbose : int, default=0 The verbosity level. params : dict, default=None Parameters to pass to the underlying estimator's ``fit`` and the CV splitter. .. versionadded:: 1.4 pre_dispatch : int or str, default='2*n_jobs' Controls the number of jobs that get dispatched during parallel execution. Reducing this number can be useful to avoid an explosion of memory consumption when more jobs get dispatched than CPUs can process. This parameter can be: - None, in which case all the jobs are immediately created and spawned. Use this for lightweight and fast-running jobs, to avoid delays due to on-demand spawning of the jobs - An int, giving the exact number of total jobs that are spawned - A str, giving an expression as a function of n_jobs, as in '2*n_jobs' method : {'predict', 'predict_proba', 'predict_log_proba', 'decision_function'}, default='predict' The method to be invoked by `estimator`. Returns ------- predictions : ndarray This is the result of calling `method`. Shape: - When `method` is 'predict' and in special case where `method` is 'decision_function' and the target is binary: (n_samples,) - When `method` is one of {'predict_proba', 'predict_log_proba', 'decision_function'} (unless special case above): (n_samples, n_classes) - If `estimator` is :term:`multioutput`, an extra dimension 'n_outputs' is added to the end of each shape above. See Also -------- cross_val_score : Calculate score for each CV split. cross_validate : Calculate one or more scores and timings for each CV split. Notes ----- In the case that one or more classes are absent in a training portion, a default score needs to be assigned to all instances for that class if ``method`` produces columns per class, as in {'decision_function', 'predict_proba', 'predict_log_proba'}. For ``predict_proba`` this value is 0. In order to ensure finite output, we approximate negative infinity by the minimum finite float value for the dtype in other cases. Examples -------- >>> from sklearn import datasets, linear_model >>> from sklearn.model_selection import cross_val_predict >>> diabetes = datasets.load_diabetes() >>> X = diabetes.data[:150] >>> y = diabetes.target[:150] >>> lasso = linear_model.Lasso() >>> y_pred = cross_val_predict(lasso, X, y, cv=3) Nr(