examples/legacy/multiple_choice/utils_multiple_choice.py/RaceProcessor/get_train_examples
class RaceProcessor:    def get_train_examples(self, data_dir):
        """See base class."""
        logger.info("LOOKING AT {} train".format(data_dir))
        high = os.path.join(data_dir, "train/high")
        middle = os.path.join(data_dir, "train/middle")
        high = self._read_txt(high)
        middle = self._read_txt(middle)
        return self._create_examples(high + middle, "train")