title: ValueError: labels ['timestamp'] not contained in axis
body: <p>I am learning machine learning and I came across this <a href="https://github.com/azabet/Machine-Learning" rel="nofollow noreferrer">code</a>.
  I am trying to run the file <code>&quot;Recommender-Systems.py&quot;</code> from the above source. But it throws an error <br>
  <code>ValueError: labels ['timestamp'] not contained in axis.</code><br> How can it be removed?</p>
  <p>Here's a dropbox <a href="https://www.dropbox.com/s/4cksq4dwgbaqd07/u.data?dl=0" rel="nofollow noreferrer">link</a> of <code>u.data</code> file.</p>