ModuleNotFoundError: No module named ‘sklearn‘

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
~AppDataLocalTemp/ipykernel_14052/3342078676.py in 
----> 1 from sklearn import preprocessing
      2 input_features = preprocessing.StandardScaler().fit_transform(features)

ModuleNotFoundError: No module named 'sklearn'

安装sklearn：

 pip install scikit-learn -i https://pypi.douban.com/simple/

 使用国内的源安装速度较快。