title: Can't import sklearn.metrics.accuracy_score
body: <p>I have successfully installed <code>sklearn</code>. However, when I run <code>sklearn.metrics.accuracy_score</code>, it givies an error <code>ImportError: No module named 'sklearn.metrics.accuracy_score'</code></p>
  
  <p><code>sklearn</code> version is <code>0.17</code></p>
  
  <p><code>numpy</code> version is <code>1.8.2</code></p>
  
  <p><code>scipy</code> version is <code>0.13.3</code></p>
  
  <p>Btw I'm using <code>python3</code>. Thanks.</p>