sklearn.preprocessing.StandardScaler采用的是哪种标准化的方法？

在默认的情况下 StandardScaler就是减去均值，然后除以标准差

from sklearn.preprocessing import StandardScaler
sc = StandardScaler()

相当于$$\frac{原始数值-均值}{标准差}$$

当然在StandardScaler中也可以设置参数with_mean和with_std

from sklearn.preprocessing import StandardScaler
sc = StandardScaler(with_mean=False)

等价于$$\frac{原始数值}{标准差}$$

类似地

from sklearn.preprocessing import StandardScaler
sc = StandardScaler(with_std=False)

等价于$${原始数值-均值}$$