【数据处理】OneHotEncoder编码

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# OneHotEncoder编码

     OneHotEncoder编码称为“哑编码”或“独热编码”，是将表示分类的数据扩维度，由列向量扩展为稀疏矩阵

# OneHotEncoder例子

# -*- coding: utf-8 -*-
from sklearn.preprocessing import OneHotEncoder
ohe = OneHotEncoder()
ohe.fit([[1],[2],[3],[4],[7],[9]])
ohe_transform = ohe.transform([[1],[2],[3],[4],[7],[9]]).toarray()
print(ohe_transform)
"""
[[ 1.  0.  0.  0.  0.  0.]
 [ 0.  1.  0.  0.  0.  0.]
 [ 0.  0.  1.  0.  0.  0.]
 [ 0.  0.  0.  1.  0.  0.]
 [ 0.  0.  0.  0.  1.  0.]
 [ 0.  0.  0.  0.  0.  1.]]
"""