code: def main(unused_argv):
    
    make_dir(FLAGS.raw_dir)
    make_dir(FLAGS.data_dir)
  
    # Get paths of download/extracted training and evaluation files.
    print("Step 1/4: Downloading data from source")
    train_files = get_raw_files(FLAGS.raw_dir, _TRAIN_DATA_SOURCES)
    eval_files = get_raw_files(FLAGS.raw_dir, _EVAL_DATA_SOURCES)
docs: Obtain training and evaluation data for the Transformer model.