code: def buildir() -> str:
      return os.path.join(get_mxnet_root(), "build")
  
file_path: mxnet/ci/build.py
imports: import argparse
  import pprint
  import os
  import signal
  import subprocess
  from itertools import chain
  from subprocess import check_call
  from typing import *
  import yaml
  from util import *
label_desc: Use image node_id 4 for calling a global function with example usage: buildir() and returns: os