title: difference between accuracy_score and jaccard_similarity_score
body: <p>What is the difference between sklearn.metrics.jaccard_similarity_score and sklearn.metrics.accuracy_score ? </p>
  
  <p>1.When do we use accuracy_score ?</p>
  
  <p>2.When do we use jaccard ?</p>
  
  <p>3.I know the formula.Could someone explain the algorithm behind these metrics.</p>
  
  <p>4.How can  I calculate jaccard on my dataframes?</p>
  
  <p><code>array([[1, 1, 1, 1, 2, 0, 1, 0],
         [2, 1, 1, 0, 1, 1, 0, 1]], dtype=int64)</code></p>
  
  <p>thanks</p>