/scikit-learn

sklearn.model_selection.RepeatedKFold

class sklearn.model_selection.RepeatedKFold(n_splits=5, n_repeats=10, random_state=None) [source]

Repeated K-Fold cross validator.

Repeats K-Fold n times with different randomization in each repetition.

Read more in the User Guide.

Parameters: n_splits : int, default=5 Number of folds. Must be at least 2. n_repeats : int, default=10 Number of times cross-validator needs to be repeated. random_state : int, RandomState instance or None, optional, default=None If int, random_state is the seed used by the random number generator; If RandomState instance, random_state is the random number generator; If None, the random number generator is the RandomState instance used by np.random.

RepeatedStratifiedKFold
Repeats Stratified K-Fold n times.

Notes

Randomized CV splitters may return different results for each call of split. You can make the results identical by setting random_state to an integer.

Examples

>>> from sklearn.model_selection import RepeatedKFold
>>> X = np.array([[1, 2], [3, 4], [1, 2], [3, 4]])
>>> y = np.array([0, 0, 1, 1])
>>> rkf = RepeatedKFold(n_splits=2, n_repeats=2, random_state=2652124)
>>> for train_index, test_index in rkf.split(X):
...     print("TRAIN:", train_index, "TEST:", test_index)
...     X_train, X_test = X[train_index], X[test_index]
...     y_train, y_test = y[train_index], y[test_index]
...
TRAIN: [0 1] TEST: [2 3]
TRAIN: [2 3] TEST: [0 1]
TRAIN: [1 2] TEST: [0 3]
TRAIN: [0 3] TEST: [1 2]

Methods

 get_n_splits([X, y, groups]) Returns the number of splitting iterations in the cross-validator split(X[, y, groups]) Generates indices to split data into training and test set.
__init__(n_splits=5, n_repeats=10, random_state=None) [source]
get_n_splits(X=None, y=None, groups=None) [source]

Returns the number of splitting iterations in the cross-validator

Parameters: X : object Always ignored, exists for compatibility. np.zeros(n_samples) may be used as a placeholder. y : object Always ignored, exists for compatibility. np.zeros(n_samples) may be used as a placeholder. groups : array-like, with shape (n_samples,), optional Group labels for the samples used while splitting the dataset into train/test set. n_splits : int Returns the number of splitting iterations in the cross-validator.
split(X, y=None, groups=None) [source]

Generates indices to split data into training and test set.

Parameters: X : array-like, shape (n_samples, n_features) Training data, where n_samples is the number of samples and n_features is the number of features. y : array-like, of length n_samples The target variable for supervised learning problems. groups : array-like, with shape (n_samples,), optional Group labels for the samples used while splitting the dataset into train/test set. train : ndarray The training set indices for that split. test : ndarray The testing set indices for that split.