An Empirical Study of Using Pre-trained BERT Models for Vietnamese Relation Extraction Task at VLSP 2020 Minh Quang Nhat Pham author 2020-12 text Proceedings of the 7th International Workshop on Vietnamese Language and Speech Processing Huyen T M Nguyen editor Xuan-Son Vu editor Chi Mai Luong editor Association for Computational Lingustics Hanoi, Vietnam conference publication pham-2020-empirical https://aclanthology.org/2020.vlsp-1.3/ 2020-12 13 18