One Law, Many Languages: Benchmarking Multilingual Legal Reasoning for Judicial Support

• URL: http://arxiv.org/abs/2306.09237v3
• Date: Wed, 21 Aug 2024 10:36:44 GMT
• Title: One Law, Many Languages: Benchmarking Multilingual Legal Reasoning for Judicial Support
• Authors: Ronja Stern, Vishvaksenan Rasiah, Veton Matoshi, Srinanda Brügger Bose, Matthias Stürmer, Ilias Chalkidis, Daniel E. Ho, Joel Niklaus,
• Abstract summary: This work introduces a novel NLP benchmark for the legal domain. It challenges LLMs in five key dimensions: processing emphlong documents (up to 50K tokens), using emphdomain-specific knowledge (embodied in legal texts) and emphmultilingual understanding (covering five languages) Our benchmark contains diverse datasets from the Swiss legal system, allowing for a comprehensive study of the underlying non-English, inherently multilingual legal system.
• Score: 18.810320088441678
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recent strides in Large Language Models (LLMs) have saturated many Natural Language Processing (NLP) benchmarks, emphasizing the need for more challenging ones to properly assess LLM capabilities. However, domain-specific and multilingual benchmarks are rare because they require in-depth expertise to develop. Still, most public models are trained predominantly on English corpora, while other languages remain understudied, particularly for practical domain-specific NLP tasks. In this work, we introduce a novel NLP benchmark for the legal domain that challenges LLMs in five key dimensions: processing \emph{long documents} (up to 50K tokens), using \emph{domain-specific knowledge} (embodied in legal texts), \emph{multilingual} understanding (covering five languages), \emph{multitasking} (comprising legal document-to-document Information Retrieval, Court View Generation, Leading Decision Summarization, Citation Extraction, and eight challenging Text Classification tasks) and \emph{reasoning} (comprising especially Court View Generation, but also the Text Classification tasks). Our benchmark contains diverse datasets from the Swiss legal system, allowing for a comprehensive study of the underlying non-English, inherently multilingual legal system. Despite the large size of our datasets (some with hundreds of thousands of examples), existing publicly available multilingual models struggle with most tasks, even after extensive in-domain pre-training and fine-tuning. We publish all resources (benchmark suite, pre-trained models, code) under permissive open CC BY-SA licenses.

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