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One Hot Encoding

时间:2023-04-05 23:44:09浏览次数:45  
标签:town categorical OneHotEncoder Encoding Hot dfle import sklearn

One Hot Encoding

one method converting categorical variables to convenient variables (e.g. 0-1) using dummy variables

Pandas

Get dummy columns

dummies = pd.get_dummies(df.town)

merged = pd.concat([df, dummies], axis='columns')

Drop one of the variables

防止变量出现完全共线性情况使参数无法估计

final = merged.drop(['town', 'west windsor'], axis='columns')

Sklearn

from sklearn.preprocessing import LabelEncoder
le = LabelEncoder()

dfle = df
dfle.town = le.fit_transform(dfle.town)

X = dfle[['town', 'area']].values
y = dfle.price
from sklearn.preprocessing import OneHotEncoder
ohe = OneHotEncoder(categorical_features=[0])

"""
报错如下:
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In [28], line 2
      1 from sklearn.preprocessing import OneHotEncoder
----> 2 ohe = OneHotEncoder(categorical_features=[0])

TypeError: __init__() got an unexpected keyword argument 'categorical_features'

原因:新版sklearn删去了"categorical_features"参数

解决:from sklearn.compose import ColumnTransformer
"""
from sklearn.preprocessing import OneHotEncoder
from sklearn.compose import ColumnTransformer
ohe = ColumnTransformer([('encoder', OneHotEncoder(), [0])], remainder='passthrough')

X = ohe.fit_transform(X)

X = X[:,1:] # Take all the rows and drop 0th column

标签:town,categorical,OneHotEncoder,Encoding,Hot,dfle,import,sklearn
From: https://www.cnblogs.com/POLAYOR/p/17291317.html

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