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When the chi-square test is used for feature selection, SelectKBest and _____ function or class must be imported from the sklearn.feature_selection module. (Enter the function interface name.) chi2 Explanation: In feature selection for classification tasks, thechi-square (#²)statistical test can be applied to evaluate the independence between features and target labels. In Python's scikit-learn library, this is implemented using:
Correct Answer:
python CopyEdit from sklearn.feature_selection import SelectKBest, chi2 SelectKBest selects the top K features based on scores returned by the chi2 function. Exact Extract from HCIP-AI EI Developer V2.5: "In scikit-learn, SelectKBest with chi2 can be used for feature selection by scoring features according to the chi-square statistic." Reference:HCIP-AI EI Developer V2.5 Official Study Guide - Chapter: Feature Selection Methods
