The `sklearn.linear_model.LassoCV.score` function is a method in the scikit-learn library in Python that is used to calculate the coefficient of determination (R^2) for a Lasso model with cross-validation. The coefficient of determination indicates the proportion of the variance in the dependent variable that can be predicted by the independent variables. The `score` method returns a floating-point number, which represents the R^2 score of the Lasso model. A higher score indicates a better fit and higher predictability of the model.
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