python 通过删除均值和缩放到单位方差来标准化特征

Posted 2021-05-09

from sklearn import preprocessing

scaler = preprocessing.StandardScaler()
# or scaler = preprocessing.StandardScaler().fit(X_train)

# Using the fit method, StandardScaler estimated the parameters: sample mean and STDEV for each feature dimension
scaler.fit(X_train)

# Return mean
scaler.mean_                                      

# Return scaled sample
scaler.scale_                                       

# standardize the training data using those estimated parameters
X_train_std = scaler.transform(X_train)