code: def _get_encoding(format: str, subtype: str):
      if format == "FLAC":
          return "FLAC"
      return _SUBTYPE_TO_ENCODING.get(subtype, "UNKNOWN")
  
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 2 for calling a global function with example usage: _get_encoding(format, subtype) and returns: _SUBTYPE_TO_ENCODING, str