code: def append_nvcc_threads(nvcc_extra_args):
      if not FORCE_SINGLE_THREAD:
          return nvcc_extra_args + ["--threads", "4"]
      else:
          return nvcc_extra_args + ["--threads", "2"]
  
imports: import sys
  import warnings
  import os
  import re
  import ast
  from pathlib import Path
  from packaging.version import parse, Version
  import platform
  from setuptools import setup, find_packages
  import subprocess
  import urllib.request
  import urllib.error
  from wheel.bdist_wheel import bdist_wheel
  import torch
  from torch.utils.cpp_extension import BuildExtension, CppExtension, CUDAExtension, CUDA_HOME
label_desc: Use image node_id 4 for calling a global function with example usage: append_nvcc_threads(nvcc_extra_args) and returns: unknown, unknown