def __init__(self, lang, additional_langs=None, **kwargs):
        """
        Args:
            lang: string, language for the input text
            **kwargs: keyword arguments forwarded to super.
        """
        super(XFUNConfig, self).__init__(**kwargs)
        self.lang = lang
        self.additional_langs = additional_langs

        Args:
            lang: string, language for the input text
            **kwargs: keyword arguments forwarded to super.
        
xdoc/fine_tuning/funsd/layoutlmft/data/datasets/xfun.py