code: def download_datasets(root: str):
      """
      Download the Imagenet-A dataset archives and expand them
      in the folder provided as parameter
      """
      IMAGENET_A_URL = (
          "https://people.eecs.berkeley.edu/~hendrycks/imagenet-a.tar"
      )
      download_and_extract_archive(
          url=IMAGENET_A_URL, download_root=root
      )
  
file_path: vissl/extra_scripts/datasets/create_imagenet_a_data_files.py
imports: import argparse
  import os
  import numpy
  import torchvision.datasets
  from iopath.common.file_io import g_pathmgr
  from tqdm import tqdm
  from vissl.utils.download import download_and_extract_archive
  from vissl.utils.io import cleanup_dir
label_desc: Use image node_id 3 for calling a global function with example usage: download_datasets(root) without return types