code: def _get_build(var, default=False):
      if var not in os.environ:
          return default
  
      val = os.environ.get(var, "0")
      trues = ["1", "true", "TRUE", "on", "ON", "yes", "YES"]
      falses = ["0", "false", "FALSE", "off", "OFF", "no", "NO"]
      if val in trues:
          return True
      if val not in falses:
          print(
              f"WARNING: Unexpected environment variable value `{var}={val}`. "
              f"Expected one of {trues + falses}"
          )
      return False
  
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 1 for calling a global function with example usage: _get_build(var, default) and returns: False, default, True