code: def main():
      logging.getLogger().setLevel(logging.INFO)
      logging.basicConfig(format="%(asctime)-15s %(message)s")
      logging.info("MXNet Windows build helper")
      instance_info = ec2_instance_info()
      if instance_info:
          logging.info("EC2: %s", instance_info)
  
      parser = argparse.ArgumentParser()
      parser.add_argument(
          "-o",
          "--output",
          help="output directory",
          default="build",
          type=str,
      )
  
      parser.add_argument(
          "--vcvars",
          help="vcvars batch file location, typically inside vs studio install dir",
          default=KNOWN_VCVARS["VS 2019"],
          type=str,
      )
  
      parser.add_argument(
          "--vcvars_ver",
          help="Optionally specifies the Visual Studio compiler toolset to use.\
              By default, the environment is set to use the current Visual Studio compiler toolset.",
          default=None,
          type=str,
      )
  
      parser.add_argument(
          "--arch", help="architecture", default="x64", type=str
      )
  
      parser.add_argument(
          "-f",
          "--flavour",
          help="build flavour",
          default="WIN_CPU",
          choices=[x.name for x in BuildFlavour],
          type=str,
      )
  
      args = parser.parse_args()
      logging.info("Build flavour: %s", args.flavour)
  
      system = platform.system()
      if system == "Windows":
          logging.info("Detected Windows platform")
          if "OpenBLAS_HOME" not in os.environ:
              os.environ[
                  "OpenBLAS_HOME"
              ] = "C:\\Program Files\\OpenBLAS-v0.2.19"
          if "OpenCV_DIR" not in os.environ:
              os.environ[
                  "OpenCV_DIR"
              ] = "C:\\Program Files\\OpenCV-v3.4.1\\build"
          if "CUDA_PATH" not in os.environ:
              os.environ[
                  "CUDA_PATH"
              ] = "C:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v10.2"
          if "MKLROOT" not in os.environ:
              os.environ[
                  "MKLROOT"
              ] = "C:\\Program Files (x86)\\IntelSWTools\\compilers_and_libraries\\windows\\mkl"
          windows_build(args)
  
      elif system == "Linux" or system == "Darwin":
          nix_build(args)
  
      else:
          logging.error(
              "Don't know how to build for {} yet".format(
                  platform.system()
              )
          )
  
      return 0
  
imports: import argparse
  import datetime
  import glob
  import logging
  import os
  import platform
  import shutil
  import sys
  import tempfile
  import time
  import zipfile
  import requests
  from distutils.dir_util import copy_tree
  from enum import Enum
  from subprocess import check_call, call
  from util import *
label_desc: Use image node_id 4 for calling a global function with example usage: main() and returns: int