code: def audio_reference(self) -> tp.Optional[tp.Tuple[torch.Tensor, int]]:
      return (
          audio_read(self.reference.path)
          if self.reference is not None
          else None
      )
  
imports: from concurrent.futures import ThreadPoolExecutor
  from dataclasses import asdict, dataclass
  from functools import lru_cache
  import hashlib
  import json
  import logging
  from pathlib import Path
  import re
  import typing
  import unicodedata
  import uuid
  import dora
  import torch
  from ...data.audio import audio_read, audio_write
label_desc: Use image node_id 4 for calling the Sample obj's underlying member method code with example usage: obj.audio_reference() and returns: unknown