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Training LLMs on data containing unfamiliar knowledge during the instruction tuning stage can encourage hallucinations. To address this challenge, we introduce NOVA, a novel framework designed to identify high-quality data that aligns well…

Computation and Language · Computer Science 2025-05-27 Shuzheng Si , Haozhe Zhao , Gang Chen , Cheng Gao , Yuzhuo Bai , Zhitong Wang , Kaikai An , Kangyang Luo , Chen Qian , Fanchao Qi , Baobao Chang , Maosong Sun

Despite recent advances in multimodal pre-training for visual description, state-of-the-art models still produce captions containing errors, such as hallucinating objects not present in a scene. The existing prominent metric for object…

Computer Vision and Pattern Recognition · Computer Science 2024-04-04 Suzanne Petryk , David M. Chan , Anish Kachinthaya , Haodi Zou , John Canny , Joseph E. Gonzalez , Trevor Darrell

Object level hallucination remains a central reliability challenge for vision language models (VLMs), particularly in binary object existence verification. Existing benchmarks emphasize aggregate accuracy but rarely disentangle whether…

Computer Vision and Pattern Recognition · Computer Science 2026-04-28 JiYang Wang , Jiawei Chen , Mengqi Xiao , Yu Cheng , Yangfu Li , Zhaoxia Yin

Multimodal Large Language Models (MLLMs) have demonstrated strong performance in visual understanding tasks, yet they often suffer from object hallucinations--generating descriptions of objects that are inconsistent with or entirely absent…

Artificial Intelligence · Computer Science 2025-05-27 Xinmiao Hu , Chun Wang , Ruihe An , ChenYu Shao , Xiaojun Ye , Sheng Zhou , Liangcheng Li

Large Audio-Language Models (LALMs) have recently achieved strong performance across various audio-centric tasks. However, hallucination, where models generate responses that are semantically incorrect or acoustically unsupported, remains…

Sound · Computer Science 2026-04-22 Feiyu Zhao , Yiming Chen , Wenhuan Lu , Daipeng Zhang , Xianghu Yue , Jianguo Wei

The rapidly developing Large Vision Language Models (LVLMs) have shown notable capabilities on a range of multi-modal tasks, but still face the hallucination phenomena where the generated texts do not align with the given contexts,…

Computer Vision and Pattern Recognition · Computer Science 2025-01-07 Wenyi Xiao , Ziwei Huang , Leilei Gan , Wanggui He , Haoyuan Li , Zhelun Yu , Fangxun Shu , Hao Jiang , Linchao Zhu

In standard large vision-language models (LVLMs) pre-training, the model typically maximizes the joint probability of the caption conditioned on the image via next-token prediction (NTP); however, since only a small subset of caption tokens…

Computer Vision and Pattern Recognition · Computer Science 2025-05-15 Yangyi Chen , Hao Peng , Tong Zhang , Heng Ji

Large Vision-Language Models (VLMs) have achieved remarkable success across diverse multimodal tasks but remain vulnerable to hallucinations rooted in inherent language bias. Despite recent progress, existing hallucination mitigation…

Computer Vision and Pattern Recognition · Computer Science 2026-02-12 Yilin Yang , Zhenghui Guo , Yuke Wang , Omprakash Gnawali , Sheng Di , Chengming Zhang

Multimodal large language models (MLLMs) contribute a powerful mechanism to understanding visual information building on large language models. However, MLLMs are notorious for suffering from hallucinations, especially when generating…

Computer Vision and Pattern Recognition · Computer Science 2024-06-03 Kai Wu , Boyuan Jiang , Zhengkai Jiang , Qingdong He , Donghao Luo , Shengzhi Wang , Qingwen Liu , Chengjie Wang

While Multimodal Large Language Models (MLLMs) have achieved remarkable success across diverse tasks, their practical deployment is severely hindered by hallucination issues, which become particularly acute during Reinforcement Learning…

Computer Vision and Pattern Recognition · Computer Science 2026-01-14 Miao Pan , Wangjie Gan , Jintao Chen , Wenqi Zhang , Bing Sun , Jianwei Yin , Xuhong Zhang

Model hallucination is one of the most critical challenges faced by Large Language Models (LLMs), especially in high-stakes code intelligence tasks. As LLMs become increasingly integrated into software engineering tasks, understanding and…

Software Engineering · Computer Science 2025-11-04 Cuiyun Gao , Guodong Fan , Chun Yong Chong , Shizhan Chen , Chao Liu , David Lo , Zibin Zheng , Qing Liao

Reducing the `$\textit{hallucination}$' problem of Large Language Models (LLMs) is crucial for their wide applications. A comprehensive and fine-grained measurement of the hallucination is the first key step for the governance of this issue…

Computation and Language · Computer Science 2024-05-31 Ziwei Ji , Yuzhe Gu , Wenwei Zhang , Chengqi Lyu , Dahua Lin , Kai Chen

Vision language models (VLMs) perceive the world through a combination of a visual encoder and a large language model (LLM). The visual encoder, pre-trained on large-scale vision-text datasets, provides zero-shot generalization to visual…

Computer Vision and Pattern Recognition · Computer Science 2024-07-19 Moon Ye-Bin , Nam Hyeon-Woo , Wonseok Choi , Tae-Hyun Oh

Despite progress in Large Vision Language Models (LVLMs), object hallucination remains a critical issue in image captioning task, where models generate descriptions of non-existent objects, compromising their reliability. Previous work…

Computer Vision and Pattern Recognition · Computer Science 2026-04-09 Shiyu Liu , Xinyi Wen , Zhibin Lan , Ante Wang , Jinsong Su

Video large language models have not yet been widely deployed, largely due to their tendency to hallucinate. Typical benchmarks for Video-LLMs rely simply on multiple-choice questions. Unfortunately, VideoLLMs hallucinate far more…

Computer Vision and Pattern Recognition · Computer Science 2025-06-11 Ruchit Rawal , Reza Shirkavand , Heng Huang , Gowthami Somepalli , Tom Goldstein

Large language models (LLMs) exhibit hallucinations in long-form question-answering tasks across various domains and wide applications. Current hallucination detection and mitigation datasets are limited in domains and sizes, which struggle…

Computation and Language · Computer Science 2024-12-20 Yuzhe Gu , Ziwei Ji , Wenwei Zhang , Chengqi Lyu , Dahua Lin , Kai Chen

Video multimodal large language models (Video-MLLMs) have achieved remarkable progress in video understanding. However, they remain vulnerable to hallucination-producing content inconsistent with or unrelated to video inputs. Previous video…

Computer Vision and Pattern Recognition · Computer Science 2025-09-03 Hao Lu , Jiahao Wang , Yaolun Zhang , Ruohui Wang , Xuanyu Zheng , Yepeng Tang , Dahua Lin , Lewei Lu

Large Language Models (LLMs) have transformed natural language processing (NLP) tasks, but they suffer from hallucination, generating plausible yet factually incorrect content. This issue extends to Video-Language Models (VideoLLMs), where…

Computer Vision and Pattern Recognition · Computer Science 2025-04-22 Ahmad Khalil , Mahmoud Khalil , Alioune Ngom

Large Language Models (LLMs) have transformed the Natural Language Processing (NLP) landscape with their remarkable ability to understand and generate human-like text. However, these models are prone to ``hallucinations'' -- outputs that do…

This survey presents a comprehensive analysis of the phenomenon of hallucination in multimodal large language models (MLLMs), also known as Large Vision-Language Models (LVLMs), which have demonstrated significant advancements and…

Computer Vision and Pattern Recognition · Computer Science 2025-04-03 Zechen Bai , Pichao Wang , Tianjun Xiao , Tong He , Zongbo Han , Zheng Zhang , Mike Zheng Shou