def log_info(self, logger):
logger.info('<STR_LIT>' % self._words_in_train_data)<EOL>logger.info("<STR_LIT>" % (self.vocab_size, self.tag_size, self.rel_size))<EOL>
Print statistical information via the provided logger

        Parameters
        ----------
        logger : logging.Logger
            logger created using logging.getLogger()