code: def _update_best_params_link(self):
          
          best_params_path = self.best_params_fname
          actual_best_params_fname = C.PARAMS_NAME % self.state.best_checkpoint
          if os.path.lexists(best_params_path):
              os.remove(best_params_path)
          os.symlink(actual_best_params_fname, best_params_path)
docs: Updates the params.best link to the latest best parameter file.