Ferryman as SemEval-2020 Task 5: Optimized BERT for Detecting Counterfactuals Weilong Chen author Yan Zhuang author Peng Wang author Feng Hong author Yan Wang author Yanru Zhang 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 chen-etal-2020-ferryman-semeval 10.18653/v1/2020.semeval-1.84 https://aclanthology.org/2020.semeval-1.84/ 2020-12 653 657