code: def maybe_wait_stream(self) -> None:
      if self.stream is not None:
          self.module.current_stream().wait_stream(self.stream)
  
file_path: pytorch_geometric/torch_geometric/loader/prefetch.py
imports: import warnings
  from contextlib import nullcontext
  from functools import partial
  from typing import Any, Optional
  import torch
  from torch.utils.data import DataLoader
  from torch_geometric.typing import WITH_IPEX
label_desc: Use image node_id 3 for calling the DeviceHelper obj's underlying member method code with example usage: obj.maybe_wait_stream() without return types