code: def load_optimizer_states(self, fname):
          
          assert self.optimizer_initialized
  
          if self._update_on_kvstore:
              self._kvstore.load_optimizer_states(fname)
          else:
              self._updater.set_states(open(fname, 'rb').read())
docs: Loads optimizer (updater) state from a file.
  
          Parameters
          ----------
          fname : str
              Path to input states file.