Utils.py 文件源码

def FeatureCombination(Df,s='',num_feature=2): 
    feature_set = []
    for c in Df.columns:
        if c.startswith(s): feature_set.append(c)
    print('combining', len(feature_set), 'features')
    data = Df[feature_set].values

    for c in Df.columns:
        if Df[c].dtype == 'object':
            lbl = preprocessing.LabelEncoder()
            lbl.fit(list(Df[c].values))
            Df[c] = lbl.transform(list(Df[c].values))

    imp = preprocessing.Imputer()
    data = imp.fit_transform(data)
    data = preprocessing.scale(data)
    pca = PCA(num_feature)
    pca.fit(data)
    print('explained_variance_ratio_:', pca.explained_variance_ratio_)
    trans = pca.transform(data)
    for i in range(0,num_feature):
        Df[s+'_%d'%(i+1)] = trans[:,i]
    Df.drop(feature_set,1,inplace=True)
    return Df