def METHOD_NAME(output_dir):
    print("Downloading and extracting diagnostic...")
    if not os.path.isdir(os.path.join(output_dir, "diagnostic")):
        os.mkdir(os.path.join(output_dir, "diagnostic"))
    data_file = os.path.join(output_dir, "diagnostic", "diagnostic.tsv")
    urllib.request.urlretrieve(TASK2PATH["diagnostic"], data_file)
    print("\tCompleted!")
    return