title: Python import error: cannot import name 'six' from 'sklearn.externals'
body: <p>I'm using numpy and mlrose, and all i have written so far is:</p>
  
  <pre><code>import numpy as np
  import mlrose
  </code></pre>
  
  <p>However, when i run it, it comes up with an error message:</p>
  
  <pre><code> File "C:\Users\&lt;my username&gt;\AppData\Local\Programs\Python\Python38-32\lib\site-packages\mlrose\neural.py", line 12, in &lt;module&gt;
      from sklearn.externals import six
  ImportError: cannot import name 'six' from 'sklearn.externals' (C:\Users\&lt;my username&gt;\AppData\Local\Programs\Python\Python38-32\lib\site-packages\sklearn\externals\__init__.py)
  </code></pre>
  
  <p>Any help on sorting this problem will be greatly appreciated.</p>