code: def download_diagnostic(data_dir):
      print("Downloading and extracting diagnostic...")
      if not os.path.isdir(os.path.join(data_dir, "diagnostic")):
          os.mkdir(os.path.join(data_dir, "diagnostic"))
      data_file = os.path.join(data_dir, "diagnostic", "diagnostic.tsv")
      urllib.request.urlretrieve(TASK2PATH["diagnostic"], data_file)
      print("\tCompleted!")
      return
  
file_path: texar/examples/bert/data/download_glue_data.py
imports: import argparse
  import os
  import sys
  import urllib.request
  import zipfile
label_desc: Use image node_id 3 for calling a global function with example usage: download_diagnostic(data_dir) without return types