Legal Information Retrieval and Entailment Using Transformer-based Approaches

Mi-Young Kim (), Juliano Rabelo (), Housam Khalifa Bashier Babiker (), Md Abed Rahman () and Randy Goebel ()
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Mi-Young Kim: University of Alberta
Juliano Rabelo: University of Alberta
Housam Khalifa Bashier Babiker: University of Alberta
Md Abed Rahman: University of Alberta
Randy Goebel: University of Alberta

The Review of Socionetwork Strategies, 2024, vol. 18, issue 1, 101-121

Abstract: Abstract The challenge of information overload in the legal domain increases every day. The COLIEE competition has created four challenge tasks that are intended to encourage the development of systems and methods to alleviate some of that pressure: a case law retrieval (Task 1) and entailment (Task 2), and a statute law retrieval (Task 3) and entailment (Task 4). Here we describe our methods for Task 1 and Task 4. In Task 1, we used a sentence-transformer model to create a numeric representation for each case paragraph. We then created a histogram of the similarities between a query case and a candidate case. The histogram is used to build a binary classifier that decides whether a candidate case should be noticed or not. In Task 4, our approach relies on fine-tuning a pre-trained DeBERTa large language model (LLM) trained on SNLI and MultiNLI datasets. Our method for Task 4 was ranked third among eight participating teams in the COLIEE 2023 competition. For Task 4, We also compared the performance of the DeBERTa model with those of a knowledge distillation model and ensemble methods including Random Forest and Voting.

Keywords: COLIEE 2023; Legal information retrieval; Legal information entailment; Transformer-based legal information extraction (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s12626-023-00153-z

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