code: def val_dataloader(self):
      return self.datamodule.val_dataloader()
  
file_path: opacus/opacus/lightning.py
imports: from typing import Any, Optional
  import pytorch_lightning
  import torch
  from opacus.data_loader import DPDataLoader
label_desc: Use image node_id 5 for calling the DPLightningDataModule obj's underlying member method code with example usage: obj.val_dataloader() and returns: self