def _load_lang_mapping_data(self):
        if isinstance(self.root, ZipFilePathPointer):
            raise RuntimeError("Please install the 'crubadan' corpus first, use nltk.download()")
        
        mapper_file = path.join(self.root, self._LANG_MAPPER_FILE)
        if self._LANG_MAPPER_FILE not in self.fileids():
            raise RuntimeError("Could not find language mapper file: " + mapper_file)

        if PY3:
            raw = open(mapper_file, 'r', encoding='utf-8').read().strip()
        else:
            raw = open(mapper_file, 'rU').read().decode('utf-8').strip()

        self._lang_mapping_data = [row.split('\t') for row in raw.split('\n')]
Return a list of node types presently loaded.
dataset/ETHPy150Open nltk/nltk/nltk/corpus/reader/crubadan.py/CrubadanCorpusReader._load_lang_mapping_data--crossover with--dataset/ETHPy150Open andrew-gardner/dependsworkflow/depends/depends_node.py/dagNodeTypes