def _annotate_second_pass(self, tokens):
        for t1, t2 in _pair_iter(tokens):
            self._second_pass_annotation(t1, t2)
            yield t1
Performs a token-based classification (section 4) over the given
dataset/ETHPy150Open nltk/nltk/nltk/tokenize/punkt.py/PunktSentenceTokenizer._annotate_second_pass