title: What does the last row mean in classification_report in scikit learn
body: <p>I wonder what the last line which says avg / total mean in scikit-learn classification report? Is it macro average or micro average? For example in the following table taken from the documentation, what is the </p>
  
  <pre><code>         precision    recall  f1-score   support
  
  class 0       0.50      1.00      0.67         1
  class 1       0.00      0.00      0.00         1
  class 2       1.00      0.67      0.80         3
  
  avg / total       0.70      0.60      0.61     5
  </code></pre>