ResearchTeam_HCN at SemEval-2023 Task 6: A knowledge enhanced transformers based legal NLP system

Dhanachandra Ningthoujam, Pinal Patel, Rajkamal Kareddula, Ramanand Vangipuram

The 17th International Workshop on Semantic Evaluation (SemEval-2023) Task 6: legaleval: understanding legal texts Paper

TLDR: This paper presents our work on LegalEval (understanding legal text), one of the tasks in SemEval-2023. It comprises of three sub-tasks namely Rhetorical Roles (RR), Legal Named Entity Recognition (L-NER), and Court Judge- ment Prediction with Explanation (CJPE). We developed different deep-learning
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Abstract: This paper presents our work on LegalEval (understanding legal text), one of the tasks in SemEval-2023. It comprises of three sub-tasks namely Rhetorical Roles (RR), Legal Named Entity Recognition (L-NER), and Court Judge- ment Prediction with Explanation (CJPE). We developed different deep-learning models for each sub-tasks. For RR, we developed a multi- task learning model with contextual sequential sentence classification as the main task and non- contextual single sentence prediction as the sec- ondary task. Our model achieved an F1-score of 76.50\% on the unseen test set, and we at- tained the 14th position on the leaderboard. For the L-NER problem, we have designed a hybrid model, consisting of a multi-stage knowledge transfer learning framework and a rule-based system. This model achieved an F1-score of 91.20\% on the blind test set and attained the top position on the final leaderboard. Finally, for the CJPE task, we used a hierarchical ap- proach and could get around 66.67\% F1-score on judgment prediction and 45.83\% F1-score on the explainability of the CJPE task, and we attained 8th position on the leaderboard for this sub-task.