title: AttributeError: module 'sklearn' has no attribute 'model_selection'
body: <p>when I want to use <code>sklearn.model_selection.train_test_split</code> to split train set and test set,it raises error  this like:</p>
  
  <pre><code>AttributeError: module 'sklearn' has no attribute 'model_selection'
  </code></pre>
  
  <p>My code is as follow:</p>
  
  <pre><code>import pandas as pd
  import sklearn
  data = pd.read_csv('SpeedVideoDataforModeling.csv',header=0,)
  data_x = data.iloc[:,1:4]
  data_y = data.iloc[:,4:]
  x_train , x_test, y_train, y_test = 
  sklearn.model_selection.train_test_split(data_x,data_y,test_size = 0.2)
  </code></pre>
  
  <p>In Pycharm,the scikit-learn package version is 0.19.1.
  <a href="https://i.stack.imgur.com/JFEKV.png" rel="noreferrer">enter image description here</a>
  Thank you for your help!</p>