11.5 feature_seleticon_filter.py 文件源码

def test_VarianceThreshold():
    '''
    test the method of VarianceThreshold
    :return:  None
    '''
    X=[[100,1,2,3],
       [100,4,5,6],
       [100,7,8,9],
       [101,11,12,13]]
    selector=VarianceThreshold(1)
    selector.fit(X)
    print("Variances is %s"%selector.variances_)
    print("After transform is %s"%selector.transform(X))
    print("The surport is %s"%selector.get_support(True))
    print("After reverse transform is %s"%
            selector.inverse_transform(selector.transform(X)))