Ahmed, Mahtab, and Robert E. Mercer. “Modelling Sentence Pairs via Reinforcement Learning: An Actor-Critic Approach to Learn the Irrelevant Words”. Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 05 (April 3, 2020): 7358-7366. Accessed April 23, 2021. https://ojs.aaai.org/index.php/AAAI/article/view/6230.