code: def setup_dir(dpath, dir_name):
      if not isdir(pjoin(dpath, dir_name)):
          subprocess.run(["mkdir", pjoin(dpath, dir_name)])
  
imports: from parlai.core.build_data import DownloadableFile
  import parlai.core.build_data
  import subprocess
  from os.path import join
  from os.path import isfile, isdir
label_desc: Use image node_id 1 for calling a global function with example usage: setup_dir(dpath, dir_name) without return types