def get_word_counter(self):
        c = Counter(token.lower() for sent in self.sentences for token, _ in sent)
        return c
Modifies |path| in place: If |path| is a directory containing exactly
dataset/ETHPy150Open erickrf/nlpnet/nlpnet/reader.py/TaggerReader.get_word_counter--crossover with--dataset/ETHPy150Open codalab/codalab-cli/codalab/lib/upload_manager.py/UploadManager._simplify_archive