title: No module named 'sklearn.cross_validation'
body: <p>I'm using anaconda , when I import </p>
  
  <pre><code>import sklearn as sk 
  </code></pre>
  
  <p>It works 
  but when import :</p>
  
  <pre><code>from sklearn.cross_validation import train_test_split
  </code></pre>
  
  <p>It returns:</p>
  
  <pre><code>No module named 'sklearn.cross_validation'
  </code></pre>
  
  <p>I checked the environment and scikit-learn is installed  what do I need
     to do?</p>