利用 sklearn 生成交叉特征：

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源码贴在下面，欢迎相互交流

import numpy as np
from sklearn.preprocessing import PolynomialFeatures
x = np.arange(9).reshape(3,3)
print(x)
poly = PolynomialFeatures(2)
poly.fit_transform(x)

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import numpy as np
from sklearn.preprocessing import PolynomialFeatures
print(x)
poly = PolynomialFeatures(degree=3,interaction_only=True)
poly.fit_transform(x)