sklearn.preprocessing.MultiLabelBinarizer
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多标签二值化:sklearn.preprocessing.MultiLabelBinarizer(classes=None, sparse_output=False)
classes_属性:若设置classes参数时,其值等于classes参数值,否则从训练集统计标签值
①classes默认值,classes_属性值从训练集中统计标签值
In [1]: from sklearn.preprocessing import MultiLabelBinarizer ...: mlb = MultiLabelBinarizer() ...: mlb.fit_transform([(1, 2), (3,4),(5,)]) ...:Out[1]:array([[1, 1, 0, 0, 0], [0, 0, 1, 1, 0], [0, 0, 0, 0, 1]])In [2]: mlb.classes_Out[2]: array([1, 2, 3, 4, 5])
In [5]: from sklearn.preprocessing import MultiLabelBinarizer ...: mlb = MultiLabelBinarizer(sparse_output=True) ...: mlb.fit_transform([set(['sci-fi', 'thriller']), set(['comedy'])]).toarr ...: ay() ...:Out[5]:array([[0, 1, 1], [1, 0, 0]])
②设置classes参数,classes_属性值等于classes参数值
In [3]: from sklearn.preprocessing import MultiLabelBinarizer ...: mlb = MultiLabelBinarizer(classes = [2,3,4,5,6,1]) ...: mlb.fit_transform([(1, 2), (3,4),(5,)]) ...:Out[3]:array([[1, 0, 0, 0, 0, 1], [0, 1, 1, 0, 0, 0], [0, 0, 0, 1, 0, 0]])In [4]: mlb.classes_Out[4]: array([2, 3, 4, 5, 6, 1])
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