Vocabulary Pyramid Network: Multi-Pass Encoding and Decoding with Multi-Level Vocabularies for Response Generation Cao Liu author Shizhu He author Kang Liu author Jun Zhao author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics Anna Korhonen editor David Traum editor Lluís Màrquez editor Association for Computational Linguistics Florence, Italy conference publication liu-etal-2019-vocabulary 10.18653/v1/P19-1367 https://aclanthology.org/P19-1367/ 2019-07 3774 3783