code: def _add_missing_extension(file_name: str) -> str:
      if not file_name.endswith(".jpg"):
          return file_name + ".jpg"
      return file_name
  
file_path: vissl/extra_scripts/datasets/create_caltech101_data_files.py
imports: import argparse
  import os
  import shutil
  import numpy
  from torchvision.datasets.utils import extract_archive
  from tqdm import tqdm
  from vissl.utils.download import download_google_drive_url, get_redirected_url, to_google_drive_download_url
  from vissl.utils.io import cleanup_dir
label_desc: Use image node_id 4 for calling a global function with example usage: _add_missing_extension(file_name) and returns: file_name, unknown