title: Sklearn won't properly import plot_confusion_matrix
body: <p>I am currently trying to follow <a href="https://scikit-learn.org/stable/auto_examples/model_selection/plot_confusion_matrix.html" rel="noreferrer">this scikit-learn example</a> to plot a confusion matrix for a classifier I have. However, I get an import error whenever I try and import with this line from my terminal:</p>
  
  <pre><code> &gt;&gt;&gt; from sklearn.metrics import plot_confusion_matrix
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: cannot import name 'plot_confusion_matrix' from 'sklearn.metrics' (/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/sklearn/metrics/__init__.py)
  </code></pre>
  
  <p>The main goal is to get this to work on a jupyter notebook (currently being run on Google Colab). The same import line gets this error: </p>
  
  <p><code>ImportError: cannot import name 'plot_confusion_matrix'</code></p>
  
  <p>Note that I have re-updated my sklearn, scipy, and numpy on my terminal and gotten the same error. <a href="https://scikit-learn.org/stable/modules/generated/sklearn.metrics.plot_confusion_matrix.html?highlight=plot_confusion_matrix" rel="noreferrer">Here</a> is the documentation for plot_confusion_matrix.</p>