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Can Large Language Models (LLMs) be trained to avoid hallucinating factual statements, and can Retrieval-Augmented Generation (RAG) be triggered only when necessary to reduce retrieval and computation costs? In this work, we address both…

Retrieval-Augmented Generation (RAG) systems typically face constraints because of their inherent mechanism: a simple top-k semantic search [1]. The approach often leads to the incorporation of irrelevant or redundant information in the…

Computation and Language · Computer Science 2025-09-03 Andreas Ottem

Retrieval-Augmented Generation (RAG) effectively improves the accuracy of Large Language Models (LLMs). However, retrieval noises significantly undermine the quality of LLMs' generation, necessitating the development of denoising…

Computation and Language · Computer Science 2026-04-21 Xinping Zhao , Shouzheng Huang , Yan Zhong , Xinshuo Hu , Meishan Zhang , Baotian Hu , Min Zhang

The rapid development of large language models has led to the widespread adoption of Retrieval-Augmented Generation (RAG), which integrates external knowledge to alleviate knowledge bottlenecks and mitigate hallucinations. However, the…

Computation and Language · Computer Science 2024-10-10 Ruotong Pan , Boxi Cao , Hongyu Lin , Xianpei Han , Jia Zheng , Sirui Wang , Xunliang Cai , Le Sun

Large language models (LLMs) are known to hallucinate, producing natural language outputs that are not grounded in the input, reference materials, or real-world knowledge. In enterprise applications where AI features support business…

Computation and Language · Computer Science 2025-08-05 Hagyeong Shin , Binoy Robin Dalal , Iwona Bialynicka-Birula , Navjot Matharu , Ryan Muir , Xingwei Yang , Samuel W. K. Wong

State-of-the-art abstractive summarization systems often generate \emph{hallucinations}; i.e., content that is not directly inferable from the source text. Despite being assumed incorrect, we find that much hallucinated content is factual,…

Computation and Language · Computer Science 2021-12-07 Meng Cao , Yue Dong , Jackie Chi Kit Cheung

Large Language Models (LLMs) achieve impressive performance across many tasks but remain prone to hallucination, especially in long-form generation where redundant retrieved contexts and lengthy reasoning chains amplify factual errors.…

Computation and Language · Computer Science 2026-05-29 Yujie Feng , Jian Li , Zhihan Zhou , Pengfei Xu , Yujia Zhang , Xiaoyu Li , Xiaohui Zhou , Alan Zhao , Xi Chen , Xiao-Ming Wu

Knowledge-to-text generators often struggle to faithfully generate descriptions for the input facts: they may produce hallucinations that contradict the input, or describe facts not present in the input. To reduce hallucinations, we propose…

Computation and Language · Computer Science 2024-04-04 Yifu Qiu , Varun Embar , Shay B. Cohen , Benjamin Han

Large language models (LLMs), especially when instruction-tuned for chat, have become part of our daily lives, freeing people from the process of searching, extracting, and integrating information from multiple sources by offering a…

Computation and Language · Computer Science 2024-11-01 Yuxia Wang , Minghan Wang , Muhammad Arslan Manzoor , Fei Liu , Georgi Georgiev , Rocktim Jyoti Das , Preslav Nakov

Retrieval-Augmented Generation (RAG) models are critically undermined by citation hallucinations, a deceptive failure where a model cites a source that fails to support its claim. While existing work attributes hallucination to a simple…

Computation and Language · Computer Science 2026-03-31 Maxime Dassen , Rebecca Kotula , Kenton Murray , Andrew Yates , Dawn Lawrie , Efsun Kayi , James Mayfield , Kevin Duh

Large Language Models are now key assistants in human decision-making processes. However, a common note always seems to follow: "LLMs can make mistakes. Be careful with important info." This points to the reality that not all outputs from…

Computation and Language · Computer Science 2025-05-16 Longchao Da , Parth Mitesh Shah , Kuan-Ru Liou , Jiaxing Zhang , Hua Wei

Hallucination is a key roadblock for applications of Large Language Models (LLMs), particularly for enterprise applications that are sensitive to information accuracy. To address this issue, two general approaches have been explored:…

Computation and Language · Computer Science 2024-10-15 Xinxi Chen , Li Wang , Wei Wu , Qi Tang , Yiyao Liu

Large Language Models have demonstrated remarkable capabilities across diverse tasks, yet they frequently generate hallucinations outputs that are fluent but factually incorrect or unsupported. We propose Counterfactual Probing, a novel…

Computation and Language · Computer Science 2025-08-05 Yijun Feng

Large language models (LLMs) embed extensive knowledge and utilize it to perform exceptionally well across various tasks. Nevertheless, outdated knowledge or factual errors within LLMs can lead to misleading or incorrect responses, causing…

Computation and Language · Computer Science 2024-10-21 Li Zeng , Yingyu Shan , Zeming Liu , Jiashu Yao , Yuhang Guo

Large Language Models (LLMs) require efficient knowledge editing (KE) to update factual information, yet existing methods exhibit significant performance decay in multi-hop factual recall. This failure is particularly acute when edits…

Computation and Language · Computer Science 2026-03-10 Jiayu Yang , Yuxuan Fan , Songning Lai , Shengen Wu , Jiaqi Tang , Chun Kang , Zhijiang Guo , Yutao Yue

Retrieval Augmented Generation (RAG) has become prevalent in question-answering (QA) tasks due to its ability of utilizing search engine to enhance the quality of long-form question-answering (LFQA). Despite the emergence of various open…

Computation and Language · Computer Science 2024-07-02 Tianchi Cai , Zhiwen Tan , Xierui Song , Tao Sun , Jiyan Jiang , Yunqi Xu , Yinger Zhang , Jinjie Gu

Detecting factual errors in textual information, whether generated by large language models (LLM) or curated by humans, is crucial for making informed decisions. LLMs' inability to attribute their claims to external knowledge and their…

Computation and Language · Computer Science 2023-10-27 Farima Fatahi Bayat , Kun Qian , Benjamin Han , Yisi Sang , Anton Belyi , Samira Khorshidi , Fei Wu , Ihab F. Ilyas , Yunyao Li

Despite the remarkable ability of large language models (LMs) to comprehend and generate language, they have a tendency to hallucinate and create factually inaccurate output. Augmenting LMs by retrieving information from external knowledge…

Computation and Language · Computer Science 2023-10-24 Zhengbao Jiang , Frank F. Xu , Luyu Gao , Zhiqing Sun , Qian Liu , Jane Dwivedi-Yu , Yiming Yang , Jamie Callan , Graham Neubig

Large Language Models (LLMs) often struggle with producing factually consistent answers due to limitations in their parametric memory. Retrieval-Augmented Generation (RAG) paradigms mitigate this issue by incorporating external knowledge at…

Computation and Language · Computer Science 2026-05-05 Shanglin Wu , Lihui Liu , Jinho D. Choi , Kai Shu

Large language models (LLMs) have demonstrated strong capabilities in text understanding and generation. However, they often lack factuality, producing a mixture of true and false information, especially in long-form generation. In this…

Computation and Language · Computer Science 2025-09-26 Lifu Tu , Rui Meng , Shafiq Joty , Yingbo Zhou , Semih Yavuz