def METHOD_NAME(swde_path, pack_path, cut_off):
    """Packs the swde dataset to a single file.
    Args:
      swde_path: The path to SWDE dataset pages (http://shortn/_g22KuARPAi).
      pack_path: The path to save packed SWDE dataset file.
      cut_off: To shorten the list for testing.
    Returns:
      None
    """
    # Get all website names for each vertical.
    #   The SWDE dataset fold is structured as follows:
    #     - swde/                                    # The root folder.
    #       - swde/auto/                             # A certain vertical.
    #         - swde/auto/auto-aol(2000)/            # A certain website.
    #           - swde/auto/auto-aol(2000)/0000.htm  # A page.
    # Get all vertical names.
    vertical_to_websites_map = constants.VERTICAL_WEBSITES
    """
    for `auto`, that is --->
    [
        "msn", "aol", "kbb", "cars", "yahoo", "autoweb", "autobytel",
        "automotive", "carquotes", "motortrend"
    ]
    """
    # The data dict initialized with the path of each html file of SWDE.
    swde_data = list()
    print("Start loading data...")
    for v in vertical_to_websites_map:
        for w in os.listdir(os.path.join(swde_path, v)):
            page_count = 0
            filenames = os.listdir(os.path.join(swde_path, v, w))
            filenames.sort()
            for filename in filenames:
                print(os.path.join(swde_path, v, w, filename))
                page = dict(vertical=v, website=w, path=os.path.join(v, w, filename))
                # path is something like `book/book-amazon(2000)/0000.htm`
                swde_data.append(page)
                page_count += 1
                if cut_off > 0 and page_count == cut_off:
                    break
    # Load the html data.
    with tqdm.tqdm(total=len(swde_data), file=sys.stdout) as progressbar:
        for page in swde_data:
            with open(os.path.join(swde_path, page["path"])) as webpage:
                page["html_str"] = webpage.read()
            progressbar.set_description("processed")
            progressbar.update(1)
    # now, the swde_data is a list
    # for each page in it
    # we have it as
    # {"vertical":'book',"website":'book-amazon(2000)',"path:'book/book-amazon(2000)/0000.htm',"html_str":xx}
    # and finally these info are dumped into the swde.pickle file
    # Save the html_str data.
    with open(pack_path, "wb") as gfo:
        pickle.dump(swde_data, gfo)