SelectKBest

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https://www.e-learn.cn/content/python/2198918from sklearn.feature_selection import SelectKBest,f_classif   #数据预处理过滤式特征选取SelectKBest模型 def test_SelectKBest():     X=[[1,2,3,4,5],           [5,4,3,2,1],           [3,3,3,3,3,],           [1,1,1,1,1]]     y=[0,1,0,1]     print("before transform:",X)     selector=SelectKBest(score_func=f_classif,k=3)     selector.fit(X,y)     print("scores_:",selector.scores_)     print("pvalues_:",selector.pvalues_)     print("selected index:",selector.get_support(True))     print("after transform:",selector.transform(X))       #调用test_SelectKBest() test_SelectKBest()