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The development of large language models (LLMs) depends on trustworthy evaluation. However, most current evaluations rely on public benchmarks, which are prone to data contamination issues that significantly compromise fairness. Previous…

Computation and Language · Computer Science 2025-06-05 Kejian Zhu , Shangqing Tu , Zhuoran Jin , Lei Hou , Juanzi Li , Jun Zhao

Data contamination presents a critical barrier preventing widespread industrial adoption of advanced software engineering techniques that leverage code language models (CLMs). This phenomenon occurs when evaluation data inadvertently…

Software Engineering · Computer Science 2024-11-19 Jialun Cao , Songqiang Chen , Wuqi Zhang , Hau Ching Lo , Shing-Chi Cheung

Benchmark datasets are critical for reproducible, reliable, and discriminative evaluation of LLMs. However, recent studies reveal that many benchmark datasets are included in pretraining corpora, i.e., $\textit{contaminated}$, which…

Machine Learning · Computer Science 2026-05-20 Ali Al-Lawati , Jason Lucas , Dongwon Lee , Suhang Wang

With the rise of Large Language Models (LLMs) in recent years, abundant new opportunities are emerging, but also new challenges, among which contamination is quickly becoming critical. Business applications and fundraising in Artificial…

Computation and Language · Computer Science 2025-07-11 Mathieu Ravaut , Bosheng Ding , Fangkai Jiao , Hailin Chen , Xingxuan Li , Ruochen Zhao , Chengwei Qin , Caiming Xiong , Shafiq Joty

Despite remarkable advancements in mitigating hallucinations in large language models (LLMs) by retrieval augmentation, it remains challenging to measure the reliability of LLMs using static question-answering (QA) data. Specifically, given…

Computation and Language · Computer Science 2024-06-04 Xiaodong Yu , Hao Cheng , Xiaodong Liu , Dan Roth , Jianfeng Gao

The problem of data contamination is now almost inevitable during the development of large language models (LLMs), with the training data commonly integrating those evaluation benchmarks even unintentionally. This problem subsequently makes…

Computation and Language · Computer Science 2025-09-19 Ruijie Hou , Yueyang Jiao , Hanxu Hu , Yingming Li , Wai Lam , Huajian Zhang , Hongyuan Lu

We propose the Data Contamination Quiz (DCQ), a simple and effective approach to detect data contamination in large language models (LLMs) and estimate the amount of it. Specifically, we frame data contamination detection as a series of…

Computation and Language · Computer Science 2025-04-29 Shahriar Golchin , Mihai Surdeanu

We present Contamination Detection via Context (CoDeC), a practical and accurate method to detect and quantify training data contamination in large language models. CoDeC distinguishes between data memorized during training and data outside…

Computation and Language · Computer Science 2026-05-13 Michał Zawalski , Meriem Boubdir , Klaudia Bałazy , Besmira Nushi , Pablo Ribalta

The rapid advancement of multimodal large language models (MLLMs) has significantly enhanced performance across benchmarks. However, data contamination-unintentional memorization of benchmark data during model training-poses critical…

Computer Vision and Pattern Recognition · Computer Science 2025-09-23 Dingjie Song , Sicheng Lai , Mingxuan Wang , Shunian Chen , Lichao Sun , Benyou Wang

The rapid development of large language model (LLM) evaluation methodologies and datasets has led to a profound challenge: integrating state-of-the-art evaluation techniques cost-effectively while ensuring reliability, reproducibility, and…

Computation and Language · Computer Science 2024-04-10 Zhuohao Yu , Chang Gao , Wenjin Yao , Yidong Wang , Zhengran Zeng , Wei Ye , Jindong Wang , Yue Zhang , Shikun Zhang

Data contamination, i.e., the presence of test data from downstream tasks in the training data of large language models (LLMs), is a potential major issue in measuring LLMs' real effectiveness on other tasks. We propose a straightforward…

Computation and Language · Computer Science 2024-02-23 Shahriar Golchin , Mihai Surdeanu

Recent claims about the impressive abilities of large language models (LLMs) are often supported by evaluating publicly available benchmarks. Since LLMs train on wide swaths of the internet, this practice raises concerns of data…

Computation and Language · Computer Science 2023-10-17 Manley Roberts , Himanshu Thakur , Christine Herlihy , Colin White , Samuel Dooley

Data contamination poses a significant threat to the reliable evaluation of Large Language Models (LLMs). This issue arises when benchmark samples may inadvertently appear in training sets, compromising the validity of reported performance.…

Computation and Language · Computer Science 2026-03-19 Yongding Tao , Tian Wang , Yihong Dong , Huanyu Liu , Kechi Zhang , Xiaolong Hu , Ge Li

Benchmark-based evaluation is the de facto standard for comparing large language models (LLMs). However, its reliability is increasingly threatened by test set contamination, where test samples or their close variants leak into training…

Computation and Language · Computer Science 2026-01-28 Jianzhe Chai , Yu Zhe , Jun Sakuma

LLM-based automatic survey systems are transforming how users acquire information from the web by integrating retrieval, organization, and content synthesis into end-to-end generation pipelines. While recent works focus on developing new…

Computation and Language · Computer Science 2025-12-03 Jiahao Zhao , Shuaixing Zhang , Nan Xu , Lei Wang

Data contamination undermines the validity of Large Language Model evaluation by enabling models to rely on memorized benchmark content rather than true generalization. While prior work has proposed contamination detection methods, these…

Computation and Language · Computer Science 2026-01-22 Chaymaa Abbas , Nour Shamaa , Mariette Awad

Large Language Models (LLMs) have recently emerged as a powerful paradigm for Knowledge Graph Completion (KGC), offering strong reasoning and generalization capabilities beyond traditional embedding-based approaches. However, existing…

Computation and Language · Computer Science 2025-10-14 Wenbin Guo , Xin Wang , Jiaoyan Chen , Lingbing Guo , Zhao Li , Zirui Chen

Data contamination has received increasing attention in the era of large language models (LLMs) due to their reliance on vast Internet-derived training corpora. To mitigate the risk of potential data contamination, LLM benchmarking has…

Machine Learning · Computer Science 2025-10-01 Simin Chen , Yiming Chen , Zexin Li , Yifan Jiang , Zhongwei Wan , Yixin He , Dezhi Ran , Tianle Gu , Haizhou Li , Tao Xie , Baishakhi Ray

Entity linkage (EL) is a critical problem in data cleaning and integration. In the past several decades, EL has typically been done by rule-based systems or traditional machine learning models with hand-curated features, both of which…

Databases · Computer Science 2020-12-04 Zhengyang Wang , Bunyamin Sisman , Hao Wei , Xin Luna Dong , Shuiwang Ji

While hallucinations of large language models could been alleviated through retrieval-augmented generation and citation generation, how the model utilizes internal knowledge is still opaque, and the trustworthiness of its generated answers…

Computation and Language · Computer Science 2025-04-22 Jiajun Shen , Tong Zhou , Yubo Chen , Delai Qiu , Shengping Liu , Kang Liu , Jun Zhao