code: def _get_bit_depth(subtype):
      if subtype not in _SUBTYPE_TO_BITS_PER_SAMPLE:
          warnings.warn(
              f"The {subtype} subtype is unknown to TorchAudio. As a result, the bits_per_sample "
              "attribute will be set to 0. If you are seeing this warning, please "
              "report by opening an issue on github (after checking for existing/closed ones). "
              "You may otherwise ignore this warning."
          )
      return _SUBTYPE_TO_BITS_PER_SAMPLE.get(subtype, 0)
  
file_path: audio/src/torchaudio/_backend/soundfile_backend.py
imports: import warnings
  from typing import Optional, Tuple
  import torch
  from torchaudio._internal import module_utils
  from .common import AudioMetaData
label_desc: Use image node_id 1 for calling a global function with example usage: _get_bit_depth(subtype) and returns: _SUBTYPE_TO_BITS_PER_SAMPLE