LexicalAT: Lexical-Based Adversarial Reinforcement Training for Robust Sentiment Classification Jingjing Xu author Liang Zhao author Hanqi Yan author Qi Zeng author Yun Liang author Xu Sun author 2019-11 text Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP) Kentaro Inui editor Jing Jiang editor Vincent Ng editor Xiaojun Wan editor Association for Computational Linguistics Hong Kong, China conference publication xu-etal-2019-lexicalat 10.18653/v1/D19-1554 https://aclanthology.org/D19-1554/ 2019-11 5518 5527