docs: def _mark_entities(self, c, markers):
          """
          Convert Snorkel candidates to marked up sequences
  
          :param c:
          :param markers:
          :return:
  
          """
          sent = c.get_parent().words
          positions = [
              [c[i].get_word_start(), c[i].get_word_end()]
              for i in range(self.cardinality)
          ]
          seq = mark_entities(sent, positions, markers=markers, style="insert")
          return [w for w in seq if w.strip()]