docs: def cleanup_all(data_home=None):
      """
      Cleans up all the example datasets in the data directory specified by
      ``get_data_home`` either to clear up disk space or start from fresh.
      """
      removed = 0
      for name, meta in DATASETS.items():
          _, ext = os.path.splitext(meta['url'])
          removed += cleanup_dataset(name, data_home=data_home, ext=ext)
  
      print(
          "Removed {} fixture objects from {}".format(removed, get_data_home(data_home))
      )