code: def increment(self, gold_set, test_set):
          "Add examples from sets."
          self.gold += len(gold_set)
          self.test += len(test_set)
          self.correct += len(gold_set & test_setf increment(self, gold_set, test_set):
          "Add examples from sets."
          self.gold += len(gold_set)
          self.test += len(test_set)
          self.correct += len(gold_set & test_set)
docs: Add examples from sets.