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    <abstract>ISCAS participated in two subtasks of SemEval 2020 Task 5: detecting counterfactual statements and detecting antecedent and consequence. This paper describes our system which is based on pretrained transformers. For the first subtask, we train several transformer-based classifiers for detecting counterfactual statements. For the second subtask, we formulate antecedent and consequence extraction as a query-based question answering problem. The two subsystems both achieved third place in the evaluation. Our system is openly released at https://github.com/casnlu/ISCASSemEval2020Task5.</abstract>
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%0 Conference Proceedings
%T ISCAS at SemEval-2020 Task 5: Pre-trained Transformers for Counterfactual Statement Modeling
%A Lu, Yaojie
%A Li, Annan
%A Lin, Hongyu
%A Han, Xianpei
%A Sun, Le
%S Proceedings of the Fourteenth Workshop on Semantic Evaluation
%D 2020
%8 dec
%I International Committee for Computational Linguistics
%C Barcelona (online)
%F lu-etal-2020-iscas
%X ISCAS participated in two subtasks of SemEval 2020 Task 5: detecting counterfactual statements and detecting antecedent and consequence. This paper describes our system which is based on pretrained transformers. For the first subtask, we train several transformer-based classifiers for detecting counterfactual statements. For the second subtask, we formulate antecedent and consequence extraction as a query-based question answering problem. The two subsystems both achieved third place in the evaluation. Our system is openly released at https://github.com/casnlu/ISCASSemEval2020Task5.
%R 10.18653/v1/2020.semeval-1.85
%U https://aclanthology.org/2020.semeval-1.85
%U https://doi.org/10.18653/v1/2020.semeval-1.85
%P 658-663

Markdown (Informal)

[ISCAS at SemEval-2020 Task 5: Pre-trained Transformers for Counterfactual Statement Modeling](https://aclanthology.org/2020.semeval-1.85) (Lu et al., SemEval 2020)

• ISCAS at SemEval-2020 Task 5: Pre-trained Transformers for Counterfactual Statement Modeling (Lu et al., SemEval 2020)

ACL

• Yaojie Lu, Annan Li, Hongyu Lin, Xianpei Han, and Le Sun. 2020. ISCAS at SemEval-2020 Task 5: Pre-trained Transformers for Counterfactual Statement Modeling. In Proceedings of the Fourteenth Workshop on Semantic Evaluation, pages 658–663, Barcelona (online). International Committee for Computational Linguistics.