code: def model_weights_ckpt(self) -> str:
      return self._model_weights_ckpt
  
imports: from __future__ import annotations
  import os
  import shutil
  import tarfile
  import tempfile
  import uuid
  from typing import Optional, Set, Union
  import torch
  from omegaconf import DictConfig, OmegaConf
  from omegaconf.omegaconf import open_dict
  from pytorch_lightning.trainer.trainer import Trainer
  from nemo.core import classes
  from nemo.utils import logging, model_utils
  from nemo.utils.app_state import AppState
  from nemo.utils.get_rank import is_global_rank_zero
  from nemo.utils.model_utils import inject_model_parallel_rank
label_desc: Use image node_id 19 for calling the SaveRestoreConnector obj's underlying member method code with example usage: obj.model_weights_ckpt() and returns: self