def __init__()

in learn_bpe.py [0:0]


    def __init__(self, fp_ins, is_dict=False):
        self.forward_index = {}
        self.inverse_index = []
        self.counter = []

        for fp in fp_ins:
            for l in fp:
                fields = l.strip('\r\n ').split(' ')
                if is_dict:
                    assert len(fields) == 2
                    self._add_word(fields[0], count=int(fields[1]))
                else:
                    for w in fields:
                        if w:
                            self._add_word(w)