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We present our method for tackling a legal case retrieval task by introducing our method of encoding documents by summarizing them into continuous vector space via our phrase scoring framework utilizing deep neural networks. On the other…

Computation and Language · Computer Science 2023-09-18 Vu Tran , Minh Le Nguyen , Satoshi Tojo , Ken Satoh

Recent research demonstrates the effectiveness of using pre-trained language models for legal case retrieval. Most of the existing works focus on improving the representation ability for the contextualized embedding of the [CLS] token and…

Information Retrieval · Computer Science 2024-03-28 Haitao Li , Qingyao Ai , Xinyan Han , Jia Chen , Qian Dong , Yiqun Liu , Chong Chen , Qi Tian

Legal case retrieval is a critical process for modern legal information systems. While recent studies have utilized pre-trained language models (PLMs) based on the general domain self-supervised pre-training paradigm to build models for…

Information Retrieval · Computer Science 2023-05-10 Yixiao Ma , Yueyue Wu , Weihang Su , Qingyao Ai , Yiqun Liu

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

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 case retrieval aims to help legal workers find relevant cases related to their cases at hand, which is important for the guarantee of fairness and justice in legal judgments. While recent advances in neural retrieval methods have…

Information Retrieval · Computer Science 2024-01-03 Weihang Su , Qingyao Ai , Yueyue Wu , Yixiao Ma , Haitao Li , Yiqun Liu , Zhijing Wu , Min Zhang

Traditionally in the domain of legal research, the retrieval of pertinent citations from intricate case descriptions has demanded manual effort and keyword-based search applications that mandate expertise in understanding legal jargon.…

Information Retrieval · Computer Science 2024-08-16 Akshat Mohan Dasula , Hrushitha Tigulla , Preethika Bhukya

In-context learning is a recent paradigm in natural language understanding, where a large pre-trained language model (LM) observes a test instance and a few training examples as its input, and directly decodes the output without any update…

Computation and Language · Computer Science 2022-05-10 Ohad Rubin , Jonathan Herzig , Jonathan Berant

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

Large language models with billions of parameters, such as GPT-3.5, GPT-4, and LLaMA, are increasingly prevalent. Numerous studies have explored effective prompting techniques to harness the power of these LLMs for various research…

Computation and Language · Computer Science 2024-03-28 Hai-Long Nguyen , Duc-Minh Nguyen , Tan-Minh Nguyen , Ha-Thanh Nguyen , Thi-Hai-Yen Vuong , Ken Satoh

Utilizing large language models (LLMs) for zero-shot document ranking is done in one of two ways: (1) prompt-based re-ranking methods, which require no further training but are only feasible for re-ranking a handful of candidate documents…

Information Retrieval · Computer Science 2024-10-22 Shengyao Zhuang , Xueguang Ma , Bevan Koopman , Jimmy Lin , Guido Zuccon

Legal case retrieval (LCR) is a cornerstone of real-world legal decision making, as it enables practitioners to identify precedents for a given query case. Existing approaches mainly rely on traditional lexical models and pretrained…

Information Retrieval · Computer Science 2025-10-31 Yanran Tang , Ruihong Qiu , Xue Li , Zi Huang

Legal dispute analysis is crucial for intelligent legal assistance systems. However, current LLMs face significant challenges in understanding complex legal concepts, maintaining reasoning consistency, and accurately citing legal sources.…

Artificial Intelligence · Computer Science 2025-09-03 Mingda Zhang , Na Zhao , Jianglong Qing , Qing xu , Kaiwen Pan , Ting luo

Prompting is used to guide or steer a language model in generating an appropriate response that is consistent with the desired outcome. Chaining is a strategy used to decompose complex tasks into smaller, manageable components. In this…

Computation and Language · Computer Science 2023-08-09 Dietrich Trautmann

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

Legal case retrieval, which aims to retrieve relevant cases given a query case, plays an essential role in the legal system. While recent research efforts improve the performance of traditional ad-hoc retrieval models, legal case retrieval…

Computation and Language · Computer Science 2022-10-12 Zhaowei Wang

Large Language Models (LLMs)-based text retrieval retrieves documents relevant to search queries based on vector similarities. Documents are pre-encoded offline, while queries arrive in real-time, necessitating an efficient online query…

Information Retrieval · Computer Science 2026-02-02 Guangyuan Ma , Yongliang Ma , Xuanrui Gou , Zhenpeng Su , Ming Zhou , Songlin Hu

Enabling efficient text-video retrieval on edge-end devices is critical for real-world applications. Yet, existing methods face a critical challenge in balancing accuracy and computational efficiency: uniform frame sampling methods ensure…

Multimedia · Computer Science 2025-07-22 Deyu Zhang , Tingting Long , Jinrui Zhang , Ligeng Chen , Ju Ren , Yaoxue Zhang

In today's legal environment, lawsuits and regulatory investigations require companies to embark upon increasingly intensive data-focused engagements to identify, collect and analyze large quantities of data. When documents are staged for…

Information Retrieval · Computer Science 2019-04-04 Rishi Chhatwal , Peter Gronvall , Nathaniel Huber-Fliflet , Robert Keeling , Jianping Zhang , Haozhen Zhao

Case law retrieval is the retrieval of judicial decisions relevant to a legal question. Case law retrieval comprises a significant amount of a lawyer's time, and is important to ensure accurate advice and reduce workload. We survey methods…

Information Retrieval · Computer Science 2022-02-16 Daniel Locke , Guido Zuccon
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