def __init__(self, custom_rules=None):
        self.custom_rules = custom_rules or {}
:return: the given file(s) as a list of
dataset/ETHPy150Open erikrose/parsimonious/parsimonious/grammar.py/RuleVisitor.__init__--crossover with--dataset/ETHPy150Open nltk/nltk/nltk/corpus/reader/tagged.py/TaggedCorpusReader.tagged_paras