title: Python, ROC curve
body: <p>I used roc_curve from sklearn.metrics. I see this error:</p>
  
  <p>I have the results of a binary classifier (true_labels ={0,1}). I need to plot the ROC curve. So I wrote:</p>
  
  <pre class="lang-py prettyprint-override"><code>X, Y, thresholds = sklearn.metrics.roc_curve(true_labels, prediction_scores, pos_label=1)
  </code></pre>
  
  <p>I see this error:</p>
  
  <pre class="lang-py prettyprint-override"><code>raise ValueError("{0} format is not supported".format(y_type))
  
  ValueError: multilabel-indicator format is not supported
  </code></pre>
  
  <p>Any helps would be appreciated!</p>