title: ImportError: No module named sklearn.preprocessing
body: <p>I installed scikit-learn successfully on Ubuntu following these <a href="http://scikit-learn.org/0.13/install.html#install-official-release" rel="noreferrer">instructions</a>.</p>
  
  <p>However, I get this error when I run a program that uses it:</p>
  
  <pre><code>Traceback (most recent call last):
    File "begueradj.py", line 10, in &lt;module&gt;
      from sklearn.preprocessing import normalize
  ImportError: No module named sklearn.preprocessing
  </code></pre>
  
  <p>How do I fix this?</p>