:param words: origin vacabulary :param n_gram: number of letters to make a n_gram term :param marks: the character added in the starting and ending position of a word :param load_from_file: load n_gram index map dict from file or not :param load_file: load f
(self, words, n_gram=3, marks='#', load_from_file=False, dump_to_file=False, file=None)
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