class sklearn.feature_selection.RFECV(estimator, step=1, cv=None, scoring=None, verbose=0, n_jobs=1)
sklearn.feature_selection.chi2(X, y)
class sklearn.feature_selection.SelectPercentile(score_func=, percentile=10)
class sklearn.feature_selection.SelectFwe(score_func=, alpha=0.05)
class sklearn.feature_selection.SelectFromModel(estimator, threshold=None, prefit=False)
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