The sklearn.linear_model.LassoCV.fit is a method in the Python library scikit-learn (sklearn) that fits a Lasso model with cross-validated alpha selection. It can be used to train a Lasso regression model, which is a linear model that performs both variable selection and regularization by adding a penalty term to the loss function. This method uses cross-validation to automatically select the best alpha (regularization parameter) for the Lasso model. By calling this method, the LassoCV model is trained on the given training data, and the optimum alpha value is determined through cross-validation.
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