How to use the epitran.cedict function in epitran

rules_file='pinyin-to-ipa.txt'):
        """Construct epitran object for Chinese

        Args:
            ligatures (bool): if True, use ligatures instead of standard IPA
            cedict_file (str): path to CC-CEDict dictionary file
            rules_file (str): name of file with rules for converting pinyin to
                              IPA
        """
        # If no cedict_file is specified, raise and error
        if not cedict_file:
            raise MissingData('Please specify a location ' +
                              'for the CC-CEDict file.')
        rules_file = os.path.join('data', 'rules', rules_file)
        rules_file = pkg_resources.resource_filename(__name__, rules_file)
        self.cedict = cedict.CEDictTrie(cedict_file)
        self.rules = rules.Rules([rules_file])
        self.regexp = re.compile(r'\p{Han}')