code: def train_dataloader(self):
      dataloader = self.datamodule.train_dataloader()
      return DPDataLoader.from_data_loader(
          dataloader, distributed=False
      )
  
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 4 for calling the DPLightningDataModule obj's underlying member method code with example usage: obj.train_dataloader() and returns: DPDataLoader