用AI预测印度保释结果,提升司法公平与效率
IBPS: Indian Bail Prediction System
- 基于15万份法院判决数据训练大模型,结合法律条文进行保释预测
- 引入法规增强后模型准确率显著提升,专家验证通过率达92%
- 适合司法改革研究者、法律科技开发者使用
保释裁决是印度法院最常见的案件类型之一,但长期存在主观性强、拖延严重和标准不一等问题。目前印度75%以上的在押人员为未决犯,多来自社会经济弱势群体,缺乏及时公正的保释裁定加剧了人权问题并导致司法积压。本文提出印度保释预测系统(IBPS),一个基于人工智能的辅助决策框架,仅依据案件事实属性与法律规定,预测保释结果并生成合法合理解释。我们构建并公开了一个包含150,430份高等法院保释判决的大规模数据集,涵盖年龄、健康状况、犯罪记录、罪名类别、羁押时长、适用法条及法官说理等结构化标注。通过参数高效微调技术对大语言模型进行训练,并在有无法条上下文、是否采用RAG等多种配置下评估性能。结果表明,融入法律知识的模型显著优于基线,具备高准确率与高质量解释能力,在由法律专家独立标注的测试集上表现良好。IBPS提供透明、可扩展、可复现的解决方案,有助于推动数据驱动的法律援助,减少保释延迟,促进程序正义。
原文摘要 · Abstract (English)
Bail decisions are among the most frequently adjudicated matters in Indian courts, yet they remain plagued by subjectivity, delays, and inconsistencies. With over 75% of India's prison population comprising undertrial prisoners, many from socioeconomically disadvantaged backgrounds, the lack of timely and fair bail adjudication exacerbates human rights concerns and contributes to systemic judicial backlog. In this paper, we present the Indian Bail Prediction System (IBPS), an AI-powered framework designed to assist in bail decision-making by predicting outcomes and generating legally sound rationales based solely on factual case attributes and statutory provisions. We curate and release a large-scale dataset of 150,430 High Court bail judgments, enriched with structured annotations such as age, health, criminal history, crime category, custody duration, statutes, and judicial reasoning. We fine-tune a large language model using parameter-efficient techniques and evaluate its performance across multiple configurations, with and without statutory context, and with RAG. Our results demonstrate that models fine-tuned with statutory knowledge significantly outperform baselines, achieving strong accuracy and explanation quality, and generalize well to a test set independently annotated by legal experts. IBPS offers a transparent, scalable, and reproducible solution to support data-driven legal assistance, reduce bail delays, and promote procedural fairness in the Indian judicial system.
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