YNU-oxz at SemEval-2020 Task 5: Detecting Counterfactuals Based on Ordered Neurons LSTM and Hierarchical Attention Network Xiaozhi Ou author Shengyan Liu author Hongling Li author 2020-12 text Proceedings of the Fourteenth Workshop on Semantic Evaluation Aurelie Herbelot editor Xiaodan Zhu editor Alexis Palmer editor Nathan Schneider editor Jonathan May editor Ekaterina Shutova editor International Committee for Computational Linguistics Barcelona (online) conference publication ou-etal-2020-ynu 10.18653/v1/2020.semeval-1.89 https://aclanthology.org/2020.semeval-1.89/ 2020-12 683 689