title: How to calculate Precision ,Recall and F1 of specific target class in Orange?
body: <p>in Test &amp; Score widget, we can change target class (if we do clasification).</p>
  <p><a href="https://i.stack.imgur.com/eo7kN.png" rel="nofollow noreferrer">Image</a></p>
  <p>But i want to do Test &amp; Score by using Python script widget.</p>
  <blockquote>
  <p>Orange.evaluation.Precision(results=None, **kwargs)</p>
  <p>Orange.evaluation.Recall(results=None, **kwargs)</p>
  <p>Orange.evaluation.F1(results=None, **kwargs)</p>
  </blockquote>
  <p>How to change target class  ?</p>