docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'name') and self.name is not None:
              _dict['name'] = self.name
          if hasattr(self, 'out_of_vocabulary_words'
                    ) and self.out_of_vocabulary_words is not None:
              _dict['out_of_vocabulary_words'] = self.out_of_vocabulary_words
          if hasattr(self, 'status') and self.status is not None:
              _dict['status'] = self.status
          if hasattr(self, 'error') and self.error is not None:
              _dict['error'] = self.error
          return _dict