code: def get_ext_modules():
      modules = [
          Extension(name="torchaudio.lib.libtorchaudio", sources=[]),
          Extension(name="torchaudio.lib._torchaudio", sources=[]),
      ]
      if _BUILD_SOX:
          modules.extend(
              [
                  Extension(
                      name="torchaudio.lib.libtorchaudio_sox",
                      sources=[],
                  ),
                  Extension(
                      name="torchaudio.lib._torchaudio_sox", sources=[]
                  ),
              ]
          )
      if _BUILD_CUDA_CTC_DECODER:
          modules.extend(
              [
                  Extension(
                      name="torchaudio.lib.libctc_prefix_decoder",
                      sources=[],
                  ),
                  Extension(
                      name="torchaudio.lib.pybind11_prefixctc",
                      sources=[],
                  ),
              ]
          )
      if _USE_FFMPEG:
          if "FFMPEG_ROOT" in os.environ:
              # single version ffmpeg mode
              modules.extend(
                  [
                      Extension(
                          name="torio.lib.libtorio_ffmpeg", sources=[]
                      ),
                      Extension(
                          name="torio.lib._torio_ffmpeg", sources=[]
                      ),
                  ]
              )
          else:
              modules.extend(
                  [
                      Extension(
                          name="torio.lib.libtorio_ffmpeg4", sources=[]
                      ),
                      Extension(
                          name="torio.lib._torio_ffmpeg4", sources=[]
                      ),
                      Extension(
                          name="torio.lib.libtorio_ffmpeg5", sources=[]
                      ),
                      Extension(
                          name="torio.lib._torio_ffmpeg5", sources=[]
                      ),
                      Extension(
                          name="torio.lib.libtorio_ffmpeg6", sources=[]
                      ),
                      Extension(
                          name="torio.lib._torio_ffmpeg6", sources=[]
                      ),
                  ]
              )
      return modules
  
file_path: audio/tools/setup_helpers/extension.py
imports: import distutils.sysconfig
  import os
  import platform
  import subprocess
  from pathlib import Path
  import torch
  from setuptools import Extension
  from setuptools.command.build_ext import build_ext
  from torch.utils.cpp_extension import CUDA_HOME
label_desc: Use image node_id 2 for calling a global function with example usage: get_ext_modules() and returns: modules