def METHOD_NAME(
    root: str,
    *,
    include_movies_data: bool = False,
    # pyre-ignore[2]
    row_mapper: Optional[Callable[[List[str]], Any]] = _default_row_mapper,
    # pyre-ignore[2]
    **open_kw,
) -> IterDataPipe:
    ratings_path = os.path.join(root, RATINGS_FILENAME)
    datapipe = LoadFiles((ratings_path,), mode="r", **open_kw)
    datapipe = ReadLinesFromCSV(datapipe, skip_first_line=True, delimiter=",")
    if include_movies_data:
        datapipe = _join_with_movies(datapipe, root)
    if row_mapper:
        datapipe = datapipe.map(row_mapper)
    return datapipe