HittER: Hierarchical Transformers for Knowledge Graph Embeddings Sanxing Chen author Xiaodong Liu author Jianfeng Gao author Jian Jiao author Ruofei Zhang author Yangfeng Ji author 2021-11 text Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Online and Punta Cana, Dominican Republic conference publication chen-etal-2021-hitter 10.18653/v1/2021.emnlp-main.812 https://aclanthology.org/2021.emnlp-main.812/ 2021-11 10395 10407