code: def _update_pbar(self, pbar_num=1, pbar_msg=None):
          
          if not isinstance(self._pbar, type(None)):
              if self.verbosity > 2 and pbar_msg is not None:
                  self._pbar.write(pbar_msg, file=self._file)
              if not self._pbar.disable:
                  self._pbar.update(pbar_num)
docs: Update self._pbar and error message during pipeline evaluation.
  
          Parameters
          ----------
          pbar_num: int
              How many pipelines has been processed
          pbar_msg: None or string
              Error message
  
          Returns
          -------
          None