Key points are not available for this paper at this time.
Guo Zhipeng, Xiaoyuan Yi, Maosong Sun, Wenhao Li, Cheng Yang, Jiannan Liang, Huimin Chen, Yuhui Zhang, Ruoyu Li. Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics: System Demonstrations. 2019.
Guo et al. (Tue,) studied this question.