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The rapid advancement of large language models (LLMs) has heightened concerns about benchmark data contamination (BDC), where models inadvertently memorize evaluation data during the training process, inflating performance metrics, and…

Computation and Language · Computer Science 2025-09-23 Cheng Xu , Nan Yan , Shuhao Guan , Changhong Jin , Yuke Mei , Yibing Guo , M-Tahar Kechadi

While large language models have achieved remarkable performance on various code generation benchmarks, there have been growing concerns regarding potential contamination of these benchmarks as they may be leaked into pretraining and…

Software Engineering · Computer Science 2024-03-11 Martin Riddell , Ansong Ni , Arman Cohan

Recent advancements in Large Language Models (LLMs) have demonstrated significant progress in various areas, such as text generation and code synthesis. However, the reliability of performance evaluation has come under scrutiny due to data…

Computation and Language · Computer Science 2025-06-06 Yuxing Cheng , Yi Chang , Yuan Wu

Public benchmarks play an essential role in the evaluation of large language models. However, data contamination can lead to inflated performance, rendering them unreliable for model comparison. It is therefore crucial to detect…

Computation and Language · Computer Science 2024-05-28 Jasper Dekoninck , Mark Niklas Müller , Martin Vechev

Data contamination in model evaluation has become increasingly prevalent with the growing popularity of large language models. It allows models to "cheat" via memorisation instead of displaying true capabilities. Therefore, contamination…

Computation and Language · Computer Science 2024-01-30 Yucheng Li , Frank Guerin , Chenghua Lin

Large language models (LLMs) are increasingly exposed to data contamination, i.e., performance gains driven by prior exposure of test datasets rather than generalization. However, in the context of tabular data, this problem is largely…

Computation and Language · Computer Science 2026-03-31 Matteo Silvestri , Fabiano Veglianti , Flavio Giorgi , Fabrizio Silvestri , Gabriele Tolomei

As large language models achieve impressive scores on traditional benchmarks, an increasing number of researchers are becoming concerned about benchmark data leakage during pre-training, commonly known as the data contamination problem. To…

Computation and Language · Computer Science 2024-06-27 Kun Qian , Shunji Wan , Claudia Tang , Youzhi Wang , Xuanming Zhang , Maximillian Chen , Zhou Yu

The opacity in developing large language models (LLMs) is raising growing concerns about the potential contamination of public benchmarks in the pre-training data. Existing contamination detection methods are typically based on the text…

Computation and Language · Computer Science 2024-10-31 Feng Yao , Yufan Zhuang , Zihao Sun , Sunan Xu , Animesh Kumar , Jingbo Shang

Data contamination has garnered increased attention in the era of large language models (LLMs) due to the reliance on extensive internet-derived training corpora. The issue of training corpus overlap with evaluation benchmarks--referred to…

Computation and Language · Computer Science 2024-06-24 Chunyuan Deng , Yilun Zhao , Yuzhao Heng , Yitong Li , Jiannan Cao , Xiangru Tang , Arman Cohan

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

In this position paper, we argue that the classical evaluation on Natural Language Processing (NLP) tasks using annotated benchmarks is in trouble. The worst kind of data contamination happens when a Large Language Model (LLM) is trained on…

Computation and Language · Computer Science 2023-10-30 Oscar Sainz , Jon Ander Campos , Iker García-Ferrero , Julen Etxaniz , Oier Lopez de Lacalle , Eneko Agirre

Imbalanced data occurs in a wide range of scenarios. The skewed distribution of the target variable elicits bias in machine learning algorithms. One of the popular methods to combat imbalanced data is to artificially balance the data…

Machine Learning · Computer Science 2021-10-26 Firuz Kamalov , Ashraf Elnagar

Diffusion models show promise for image restoration, but existing methods often struggle with inconsistent fidelity and undesirable artifacts. To address this, we introduce Kernel Density Steering (KDS), a novel inference-time framework…

Computer Vision and Pattern Recognition · Computer Science 2025-10-28 Yuyang Hu , Kangfu Mei , Mojtaba Sahraee-Ardakan , Ulugbek S. Kamilov , Peyman Milanfar , Mauricio Delbracio

The rapid evolution of code largelanguage models underscores the need for effective and transparent benchmarking of their reasoning capabilities. However, the current benchmarking approach heavily depends on publicly available,…

Software Engineering · Computer Science 2025-06-05 Simin Chen , Pranav Pusarla , Baishakhi Ray

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

Data contamination in model evaluation is getting increasingly prevalent as the massive training corpora of large language models often unintentionally include benchmark samples. Therefore, contamination analysis has became an inevitable…

Computation and Language · Computer Science 2023-09-28 Yucheng Li

Large language models are widespread, with their performance on benchmarks frequently guiding user preferences for one model over another. However, the vast amount of data these models are trained on can inadvertently lead to contamination…

Machine Learning · Computer Science 2024-02-13 Jasper Dekoninck , Mark Niklas Müller , Maximilian Baader , Marc Fischer , Martin Vechev

Amid the expanding use of pre-training data, the phenomenon of benchmark dataset leakage has become increasingly prominent, exacerbated by opaque training processes and the often undisclosed inclusion of supervised data in contemporary…

Computation and Language · Computer Science 2024-04-30 Ruijie Xu , Zengzhi Wang , Run-Ze Fan , Pengfei Liu

Synthetic data has become essential for training foundation models, yet benchmark contamination threatens evaluation integrity. Although existing detection methods identify token-level overlap, they fail to detect semantic-level…

Machine Learning · Computer Science 2025-11-25 Sushant Mehta

Large language models (LLMs) are known to be trained on vast amounts of data, which may unintentionally or intentionally include data from commonly used benchmarks. This inclusion can lead to cheatingly high scores on model leaderboards,…

Computation and Language · Computer Science 2025-03-19 Huixuan Zhang , Yun Lin , Xiaojun Wan
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