Web Reference: Dec 17, 2025 · Cross-validation is a technique used to check how well a machine learning model performs on unseen data while preventing overfitting. It works by: Splitting the dataset into several parts. Training the model on some parts and testing it on the remaining part. Learn how to use cross-validation to avoid overfitting and estimate the generalization performance of a machine learning model. See examples of k-fold cross-validation, scoring parameters, and custom cross-validation strategies. Cross-validation is a machine learning validation procedure to evaluate the performance of a model using multiple subsets of data, as opposed to relying on only one subset.
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