code: def setup(self, stage: Optional[str] = None) -> None:
      self.datamodule.setup(stage)
  
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 3 for calling the DPLightningDataModule obj's underlying member method code with example usage: obj.setup(stage) without return types