def print_statistics(self, train_stat: Dict, valid_stat: Dict, test_stat: Dict) -> None:
        """ Print out the relation statistics as a markdown table """
        df = pd.DataFrame([self.rel2relid, train_stat, valid_stat, test_stat]).T
        df.columns = ['d{}'.format(i) for i, col in enumerate(df, 1)]
        logger.info("\n")
        logger.info(df)
 Print out the relation statistics as a markdown table 
deeppavlov/dataset_readers/docred_reader.py