How to use the epitran.ppprocessor.PrePostProcessor function in epitran

self.puncnorm = PuncNorm()
        self.ft = panphon.FeatureTable()
        self.num_panphon_fts = len(self.ft.names)
        self.preprocessor = PrePostProcessor(code, 'pre', False)
        self.postprocessor = PrePostProcessor(code, 'post', False)
        self.strip_diacritics = StripDiacritics(code)
        self.preproc = preproc
        self.postproc = postproc
        self.ligatures = ligatures
        self.rev_preproc = rev_preproc
        self.rev_postproc = rev_postproc
        if rev:
            self.rev_g2p = self._load_g2p_map(code, True)
            self.rev_regexp = self._construct_regex(self.rev_g2p.keys())
            self.rev_preprocessor = PrePostProcessor(code, 'pre', True)
            self.rev_postprocessor = PrePostProcessor(code, 'post', True)

        self.nils = defaultdict(int)

self.regexp = self._construct_regex(self.g2p.keys())
        self.puncnorm = PuncNorm()
        self.ft = panphon.FeatureTable()
        self.num_panphon_fts = len(self.ft.names)
        self.preprocessor = PrePostProcessor(code, 'pre', False)
        self.postprocessor = PrePostProcessor(code, 'post', False)
        self.strip_diacritics = StripDiacritics(code)
        self.preproc = preproc
        self.postproc = postproc
        self.ligatures = ligatures
        self.rev_preproc = rev_preproc
        self.rev_postproc = rev_postproc
        if rev:
            self.rev_g2p = self._load_g2p_map(code, True)
            self.rev_regexp = self._construct_regex(self.rev_g2p.keys())
            self.rev_preprocessor = PrePostProcessor(code, 'pre', True)
            self.rev_postprocessor = PrePostProcessor(code, 'post', True)

        self.nils = defaultdict(int)

code (str): ISO 639-3 code and ISO 15924 code joined with a hyphen
            preproc (bool): if True, apply preprocessor
            postproc (bool): if True, apply postprocessors
            ligatures (bool): if True, use phonetic ligatures for affricates
                              instead of standard IPA
            rev (bool): if True, load reverse transliteration
            rev_preproc (bool): if True, apply preprocessor when reverse transliterating
            rev_postproc (bool): if True, apply postprocessor when reverse transliterating
        """
        self.rev = rev
        self.g2p = self._load_g2p_map(code, False)
        self.regexp = self._construct_regex(self.g2p.keys())
        self.puncnorm = PuncNorm()
        self.ft = panphon.FeatureTable()
        self.num_panphon_fts = len(self.ft.names)
        self.preprocessor = PrePostProcessor(code, 'pre', False)
        self.postprocessor = PrePostProcessor(code, 'post', False)
        self.strip_diacritics = StripDiacritics(code)
        self.preproc = preproc
        self.postproc = postproc
        self.ligatures = ligatures
        self.rev_preproc = rev_preproc
        self.rev_postproc = rev_postproc
        if rev:
            self.rev_g2p = self._load_g2p_map(code, True)
            self.rev_regexp = self._construct_regex(self.rev_g2p.keys())
            self.rev_preprocessor = PrePostProcessor(code, 'pre', True)
            self.rev_postprocessor = PrePostProcessor(code, 'post', True)

        self.nils = defaultdict(int)

preproc (bool): if True, apply preprocessor
            postproc (bool): if True, apply postprocessors
            ligatures (bool): if True, use phonetic ligatures for affricates
                              instead of standard IPA
            rev (bool): if True, load reverse transliteration
            rev_preproc (bool): if True, apply preprocessor when reverse transliterating
            rev_postproc (bool): if True, apply postprocessor when reverse transliterating
        """
        self.rev = rev
        self.g2p = self._load_g2p_map(code, False)
        self.regexp = self._construct_regex(self.g2p.keys())
        self.puncnorm = PuncNorm()
        self.ft = panphon.FeatureTable()
        self.num_panphon_fts = len(self.ft.names)
        self.preprocessor = PrePostProcessor(code, 'pre', False)
        self.postprocessor = PrePostProcessor(code, 'post', False)
        self.strip_diacritics = StripDiacritics(code)
        self.preproc = preproc
        self.postproc = postproc
        self.ligatures = ligatures
        self.rev_preproc = rev_preproc
        self.rev_postproc = rev_postproc
        if rev:
            self.rev_g2p = self._load_g2p_map(code, True)
            self.rev_regexp = self._construct_regex(self.rev_g2p.keys())
            self.rev_preprocessor = PrePostProcessor(code, 'pre', True)
            self.rev_postprocessor = PrePostProcessor(code, 'post', True)

        self.nils = defaultdict(int)