title: How can I downgrade the version pytorch from 0.4 to 0.31 with anaconda?
body: <p>I'm using anaconda now and due to some code error I need to downgrade the pytorch from version 0.4 to version 0.31.<br />
  However, as I use anaconda as my python package management tool, I used the instruction below to downgrade it and encountered the following error:</p>
  <p><code> conda install pytorch=0.31 cuda80 -c soumith</code></p>
  <blockquote>
  <p>PackagesNotFoundError: The following packages are not available from current channels:</p>
  <ul>
  <li>pytorch=0.31</li>
  </ul>
  </blockquote>
  <p>And I also have tried some normal method to revert the package into previous verion in anaconda, but they failed either.</p>
  <p>Could anyone tell me how to downgrade it? Thank you so much!!</p>