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In tasks like summarization and open-book question answering (QA), Large Language Models (LLMs) often encounter "contextual hallucination", where they produce irrelevant or incorrect responses despite having access to accurate source…

Computation and Language · Computer Science 2025-07-08 Yu Wang , Kamalika Das , Xiang Gao , Wendi Cui , Peng Li , Jiaxin Zhang

While the problem of hallucinations in neural machine translation has long been recognized, so far the progress on its alleviation is very little. Indeed, recently it turned out that without artificially encouraging models to hallucinate,…

Computation and Language · Computer Science 2022-12-21 David Dale , Elena Voita , Loïc Barrault , Marta R. Costa-jussà

The emergence of large language models (LLMs) has significantly advanced the development of natural language processing (NLP), especially in text generation tasks like question answering. However, model hallucinations remain a major…

Computation and Language · Computer Science 2025-12-01 Zhongxin Liu , Zhiwei Wang , Jun Niu , Ying Li , Hongyu Sun , Meng Xu , He Wang , Gaofei Wu , Yuqing Zhang

Large language models (LLMs) frequently generate hallucinations-content that deviates from factual accuracy or provided context-posing challenges for diagnosis due to the complex interplay of underlying causes. This paper introduces a…

Computation and Language · Computer Science 2025-04-18 Yiyou Sun , Yu Gai , Lijie Chen , Abhilasha Ravichander , Yejin Choi , Dawn Song

Score-based diffusion models have achieved incredible performance in generating realistic images, audio, and video data. While these models produce high-quality samples with impressive details, they often introduce unrealistic artifacts,…

Machine Learning · Computer Science 2025-03-06 Rui Lu , Runzhe Wang , Kaifeng Lyu , Xitai Jiang , Gao Huang , Mengdi Wang

Large language models (LLMs) hallucinate: they produce fluent outputs that are factually incorrect. We present a geometric dynamical systems framework in which hallucinations arise from task-dependent basin structure in latent space. Using…

Computation and Language · Computer Science 2026-04-07 Kalyan Cherukuri , Lav R. Varshney

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

With the rapid development of large language models (LLMs), LLM-as-a-judge has emerged as a widely adopted approach for text quality evaluation, including hallucination evaluation. While previous studies have focused exclusively on…

Computation and Language · Computer Science 2025-03-04 Siya Qi , Rui Cao , Yulan He , Zheng Yuan

Hallucination refers to the inaccurate, irrelevant, and inconsistent text generated from large language models (LLMs). While the LLMs have shown great promise in a variety of tasks, the issue of hallucination still remains a major challenge…

Computation and Language · Computer Science 2025-02-26 Junhyun Lee , Harshith Goka , Hyeonmok Ko

Despite impressive advances in Natural Language Generation (NLG) and Large Language Models (LLMs), researchers are still unclear about important aspects of NLG evaluation. To substantiate this claim, I examine current classifications of…

Computation and Language · Computer Science 2024-01-17 Kees van Deemter

This theoretical work examines 'hallucinations' in both human cognition and large language models, comparing how each system can produce perceptions or outputs that deviate from reality. Drawing on neuroscience and machine learning…

Neurons and Cognition · Quantitative Biology 2025-03-11 Sebastian Barros

Abstractive summarization has enjoyed renewed interest in recent years, thanks to pre-trained language models and the availability of large-scale datasets. Despite promising results, current models still suffer from generating factually…

Computation and Language · Computer Science 2024-01-08 Roee Aharoni , Shashi Narayan , Joshua Maynez , Jonathan Herzig , Elizabeth Clark , Mirella Lapata

Hallucination is a known issue for neural abstractive summarization models. Recent work suggests that the degree of hallucination may depend on errors in the training data. In this work, we propose a new method called Contrastive Parameter…

Computation and Language · Computer Science 2022-05-23 Prafulla Kumar Choubey , Alexander R. Fabbri , Jesse Vig , Chien-Sheng Wu , Wenhao Liu , Nazneen Fatema Rajani

Abstractive summarization systems today produce fluent and relevant output, but often "hallucinate" statements not supported by the source text. We analyze the connection between hallucinations and training data, and find evidence that…

Computation and Language · Computer Science 2023-11-20 Daniel King , Zejiang Shen , Nishant Subramani , Daniel S. Weld , Iz Beltagy , Doug Downey

We investigate the problem of generating instructions to guide humans to navigate in simulated residential environments. A major issue with current models is hallucination: they generate references to actions or objects that are…

Computation and Language · Computer Science 2023-10-25 Lingjun Zhao , Khanh Nguyen , Hal Daumé

Large Language Models (LLMs) have become increasingly important in natural language processing, enabling advanced data analytics through natural language queries. However, these models often generate "hallucinations"-inaccurate or…

Computation and Language · Computer Science 2024-10-29 Mikhail Rumiantsau , Aliaksei Vertsel , Ilya Hrytsuk , Isaiah Ballah

With the advent of rich visual representations and pre-trained language models, video captioning has seen continuous improvement over time. Despite the performance improvement, video captioning models are prone to hallucination.…

Computer Vision and Pattern Recognition · Computer Science 2022-09-29 Nasib Ullah , Partha Pratim Mohanta

Typical user-friendly renderings of knowledge graphs are visualisations and natural language text. Within the latter HCI solution approach, data-driven natural language generation systems receive increased attention, but they are often…

Computation and Language · Computer Science 2021-06-29 Zola Mahlaza , C. Maria Keet , Jarryd Dunn , Matthew Poulter

Despite their powerful chat, coding, and reasoning abilities, Large Language Models (LLMs) frequently hallucinate. Conventional wisdom suggests that hallucinations are a consequence of a balance between creativity and factuality, which can…

Multimodal language models can exhibit hallucinations in their outputs, which limits their reliability. The ability to automatically detect these errors is important for mitigating them, but has been less explored and existing efforts do…

Computation and Language · Computer Science 2024-09-04 Spencer Whitehead , Jacob Phillips , Sean Hendryx