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Legal Case Retrieval (LCR), which retrieves relevant cases from a query case, is a fundamental task for legal professionals in research and decision-making. However, existing studies on LCR face two major limitations. First, they are…

Computation and Language · Computer Science 2025-10-07 Chaeeun Kim , Jinu Lee , Wonseok Hwang

Statutory law retrieval is a typical problem in legal language processing, that has various practical applications in law engineering. Modern deep learning-based retrieval methods have achieved significant results for this problem. However,…

Computation and Language · Computer Science 2024-10-17 Hai-Long Nguyen , Tan-Minh Nguyen , Duc-Minh Nguyen , Thi-Hai-Yen Vuong , Ha-Thanh Nguyen , Xuan-Hieu Phan

Legal case retrieval (LCR) aims to automatically scour for comparable legal cases based on a given query, which is crucial for offering relevant precedents to support the judgment in intelligent legal systems. Due to similar goals, it is…

Computation and Language · Computer Science 2025-02-26 Nuo Xu , Pinghui Wang , Zi Liang , Junzhou Zhao , Xiaohong Guan

Legal case retrieval for sourcing similar cases is critical in upholding judicial fairness. Different from general web search, legal case retrieval involves processing lengthy, complex, and highly specialized legal documents. Existing…

Information Retrieval · Computer Science 2024-07-01 Chenlong Deng , Kelong Mao , Zhicheng Dou

In this paper, we address the issue of using logic rules to explain the results from legal case retrieval. The task is critical to legal case retrieval because the users (e.g., lawyers or judges) are highly specialized and require the…

Information Retrieval · Computer Science 2024-03-05 Zhongxiang Sun , Kepu Zhang , Weijie Yu , Haoyu Wang , Jun Xu

Legal case retrieval (LCR) is a specialised information retrieval task aimed at identifying relevant cases given a query case. LCR holds pivotal significance in facilitating legal practitioners to locate legal precedents. Existing LCR…

Information Retrieval · Computer Science 2026-03-06 Yanran Tang , Ruihong Qiu , Yilun Liu , Xue Li , Zi Huang

Legal case retrieval (LCR) aims to provide similar cases as references for a given fact description. This task is crucial for promoting consistent judgments in similar cases, effectively enhancing judicial fairness and improving work…

Information Retrieval · Computer Science 2024-10-10 Cheng Gao , Chaojun Xiao , Zhenghao Liu , Huimin Chen , Zhiyuan Liu , Maosong Sun

Retrieval-Augmented Generation (RAG) enhances Large Language Model (LLM) output by providing prior knowledge as context to input. This is beneficial for knowledge-intensive and expert reliant tasks, including legal question-answering, which…

Large language models (LLMs) often struggle with context fidelity, producing inconsistent answers when responding to questions based on provided information. Existing approaches either rely on expensive supervised fine-tuning to generate…

Computation and Language · Computer Science 2025-09-18 Suyuchen Wang , Jinlin Wang , Xinyu Wang , Shiqi Li , Xiangru Tang , Sirui Hong , Xiao-Wen Chang , Chenglin Wu , Bang Liu

Legal retrieval techniques play an important role in preserving the fairness and equality of the judicial system. As an annually well-known international competition, COLIEE aims to advance the development of state-of-the-art retrieval…

Information Retrieval · Computer Science 2024-04-02 Haitao Li , You Chen , Zhekai Ge , Qingyao Ai , Yiqun Liu , Quan Zhou , Shuai Huo

Determining which legal cases are relevant to a given query involves navigating lengthy texts and applying nuanced legal reasoning. Traditionally, this task has demanded significant time and domain expertise to identify key Legal Facts and…

Artificial Intelligence · Computer Science 2025-08-15 Shengjie Ma , Qi Chu , Jiaxin Mao , Xuhui Jiang , Haozhe Duan , Chong Chen

Legal case retrieval plays an important role for legal practitioners to effectively retrieve relevant cases given a query case. Most existing neural legal case retrieval models directly encode the whole legal text of a case to generate a…

Information Retrieval · Computer Science 2023-09-07 Yanran Tang , Ruihong Qiu , Xue Li

Semantic textual similartiy (STS) and information retrieval tasks (IR) tasks have been the two major avenues to record the progress of embedding models in the past few years. Under the emerging Retrieval-augmented Generation (RAG) paradigm,…

Computation and Language · Computer Science 2024-05-14 Chenghao Xiao , G Thomas Hudson , Noura Al Moubayed

The tasks of legal case retrieval have received growing attention from the IR community in the last decade. Relevance feedback techniques with implicit user feedback (e.g., clicks) have been demonstrated to be effective in traditional…

Information Retrieval · Computer Science 2024-03-21 Ruizhe Zhang , Qingyao Ai , Ziyi Ye , Yueyue Wu , Xiaohui Xie , Yiqun Liu

Legal precedent retrieval is a cornerstone of the common law system, governed by the principle of stare decisis, which demands consistency in judicial decisions. However, the growing complexity and volume of legal documents challenge…

Computation and Language · Computer Science 2025-08-04 Shubham Kumar Nigam , Tanmay Dubey , Noel Shallum , Arnab Bhattacharya

We present our method for tackling the legal case retrieval task of the Competition on Legal Information Extraction/Entailment 2019. Our approach is based on the idea that summarization is important for retrieval. On one hand, we adopt a…

Computation and Language · Computer Science 2020-09-30 Vu Tran , Minh Le Nguyen , Ken Satoh

Learned Sparse Retrieval (LSR) methods construct sparse lexical representations of queries and documents that can be efficiently searched using inverted indexes. Existing LSR approaches have relied almost exclusively on uncased backbone…

Information Retrieval · Computer Science 2026-01-27 Emmanouil Georgios Lionis , Jia-Huei Ju , Angelos Nalmpantis , Casper Thuis , Sean MacAvaney , Andrew Yates

As the legal community increasingly examines the use of large language models (LLMs) for various legal applications, legal AI developers have turned to retrieval-augmented LLMs ("RAG" systems) to improve system performance and robustness.…

Computation and Language · Computer Science 2025-05-08 Lucia Zheng , Neel Guha , Javokhir Arifov , Sarah Zhang , Michal Skreta , Christopher D. Manning , Peter Henderson , Daniel E. Ho

Case-based reasoning (CBR) is an experience-based approach to problem solving, where a repository of solved cases is adapted to solve new cases. Recent research shows that Large Language Models (LLMs) with Retrieval-Augmented Generation…

Artificial Intelligence · Computer Science 2025-01-10 Ofir Marom

Retrieval-Augmented Generation (RAG) systems are showing promising potential, and are becoming increasingly relevant in AI-powered legal applications. Existing benchmarks, such as LegalBench, assess the generative capabilities of Large…

Artificial Intelligence · Computer Science 2024-08-21 Nicholas Pipitone , Ghita Houir Alami
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