code: def _to_dict(self):
          
          _dict = {}
          if hasattr(self, 'class_name') and self.class_name is not None:
              _dict['class'] = self.class_name
          if hasattr(self, 'score') and self.score is not None:
              _dict['score'] = self.score
          if hasattr(self, 'type_hierarchy') and self.type_hierarchy is not None:
              _dict['type_hierarchy'] = self.type_hierarchy
          return _dict
docs: Return a json dictionary representing this model.