code: def create_example_mar():
      # Create only if not already present
      if not os.path.exists(DCGAN_MAR_FILE):
          create_mar_cmd = (
              "cd " + DCGAN_EXAMPLE_DIR + ";./create_mar.sh"
          )
          subprocess.check_call(create_mar_cmd, shell=True)
  
file_path: serve/test/pytest/test_example_dcgan.py
imports: import os
  import subprocess
  import requests
  import test_utils
  from shutil import copy
  from PIL import Image
  from io import BytesIO
label_desc: Use image node_id 3 for calling a global function with example usage: create_example_mar() without return types