The sklearn.model_selection.LeaveOneOut function is an iterator for cross-validation where each observation is used once as the test set while the rest of the data is used as the training set. This function is useful when there is limited data available for training and provides a method to validate the model performance without wastage of data.
Example: Suppose we have a dataset 'X' with 10 observations and we want to perform cross-validation using LeaveOneOut.
Code:
from sklearn.model_selection import LeaveOneOut for train_index, test_index in LeaveOneOut().split(X): X_train, X_test = X[train_index], X[test_index] y_train, y_test = y[train_index], y[test_index]
In this example, the LeaveOneOut function is used to split the data into training and testing sets for each iteration. The train_index and test_index variables are iteratively assigned to each observation, and the arrays X_train and y_train contain the training data while the arrays X_test and y_test contain the test data.
Package Library: The sklearn.model_selection.LeaveOneOut function belongs to the sklearn package library. It is used in machine learning applications to perform cross-validation for evaluation of model performance.
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