def __init__(self, *args):
    """Create a hand transitions predictor.

    :param version_number: (int) Version of the predictor system.

    """
    self._models = dict()
    self._model = None
    self._version = BaseWhereModelPredictor.DEFAULT_VERSION

def version_numbers(self) -> list:
    """Return the whole list of supported version numbers."""
    return list(self._models.keys())

def get_version_number(self) -> int:
    """Return the version number of the selected predictor (int)."""
    return self._version

def set_version_number(self, version_number: int) -> None:
    """Change the predictor version number.

        :param version_number: (int) One of the supported versions.
        :raises: sppasKeyError: if invalid version number
        :raises: sppasTypeError: invalid type for given version_number

        """
    try:
        v = int(version_number)
    except ValueError:
        raise sppasTypeError('int', str(type(version_number)))
    authorized = self.version_numbers()
    try:
        if v not in authorized:
            raise sppasKeyError(str(authorized), version_number)
    except ValueError:
        logging.error('{}: Invalid predictor version {}. Expected one of: {}'.format(self.__name__, version_number, authorized))
        raise sppasKeyError(str(authorized), version_number)
    self._version = v
    self._model = self._models[self._version]()

def vowel_codes(self) -> tuple:
    """Return the list of vowel codes the class can predict.

        """
    if self._model is None:
        return ()
    if hasattr(self._model, 'vowel_codes') is False:
        return ()
    return self._model.vowel_codes()