title: sklearn ImportError: cannot import name plot_roc_curve
body: <p>I am trying to plot a Receiver Operating Characteristics (ROC) curve with cross validation, following the <a href="https://scikit-learn.org/stable/auto_examples/model_selection/plot_roc_crossval.html" rel="noreferrer">example</a> provided in sklearn's documentation. However, the following import gives an <code>ImportError</code>, in both <code>python2</code> and <code>python3</code>.</p>
  
  <pre><code>from sklearn.metrics import plot_roc_curve
  </code></pre>
  
  <p><strong>Error:</strong></p>
  
  <pre><code>Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: cannot import name plot_roc_curve
  </code></pre>
  
  <p><code>python-2.7</code> sklearn version: <code>0.20.2.</code></p>
  
  <p><code>python-3.6</code> sklearn version: <code>0.21.3.</code></p>
  
  <p>I found that the following import works fine, but it's not quite the same as <code>plot_roc_curve</code>.</p>
  
  <pre><code>from sklearn.metrics import roc_curve
  </code></pre>
  
  <p>Is <code>plot_roc_curve</code> deprecated? Could somebody try the code and let me know the sklearn version if it works?</p>