title: ModuleNotFoundError: No module named 'past' when installing tensorboard with pytorch 1.2
body: <p>I'm trying out tensorboard with pytorch by following this: <a href="https://pytorch.org/docs/stable/tensorboard.html" rel="noreferrer">https://pytorch.org/docs/stable/tensorboard.html</a></p>
  
  <p>I've installed tensorboard with <code>pip install tb-nightly</code></p>
  
  <p>The command <code>tensorboard --logdir=runs</code> starts ok.</p>
  
  <p>But the line <code>self.writer = SummaryWriter()</code></p>
  
  <p>Gives the following error:</p>
  
  <pre><code>ModuleNotFoundError: No module named 'past'
  </code></pre>
  
  <p>How do I fix this?</p>