def __init__(self, train_text=None, verbose=False,
            lang_vars=PunktLanguageVars(), token_cls=PunktToken):
        PunktBaseClass.__init__(self, lang_vars=lang_vars,
                token_cls=token_cls)

        if train_text:
            self._params = self.train(train_text, verbose)
train_text can either be the sole training text for this sentence
dataset/ETHPy150Open nltk/nltk/nltk/tokenize/punkt.py/PunktSentenceTokenizer.__init__