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Benchmark contamination poses a significant challenge to the reliability of Large Language Models (LLMs) evaluations, as it is difficult to assert whether a model has been trained on a test set. We introduce a solution to this problem by…

Cryptography and Security · Computer Science 2025-07-22 Tom Sander , Pierre Fernandez , Saeed Mahloujifar , Alain Durmus , Chuan Guo

CDD, or Contamination Detection via output Distribution, identifies data contamination by measuring the peakedness of a model's sampled outputs. We study the conditions under which this approach succeeds and fails on small language models…

Artificial Intelligence · Computer Science 2026-03-12 Omer Sela

There has been significant research on propagandistic content detection across different modalities and languages. However, most studies have primarily focused on detection, with little attention given to explanations justifying the…

Computation and Language · Computer Science 2025-09-30 Maram Hasanain , Md Arid Hasan , Mohamed Bayan Kmainasi , Elisa Sartori , Ali Ezzat Shahroor , Giovanni Da San Martino , Firoj Alam

Recent work suggests that large language models (LLMs) can improve performance of speech tasks compared to existing systems. To support their claims, results on LibriSpeech and Common Voice are often quoted. However, this work finds that a…

Audio and Speech Processing · Electrical Eng. & Systems 2025-06-06 Yuan Tseng , Titouan Parcollet , Rogier van Dalen , Shucong Zhang , Sourav Bhattacharya

Despite notable advances in large language models (LLMs), reliable evaluation of text generation tasks such as text style transfer (TST) remains an open challenge. Existing research has shown that automatic metrics often correlate poorly…

Computation and Language · Computer Science 2026-03-05 Vitaly Protasov , Nikolay Babakov , Daryna Dementieva , Alexander Panchenko

Pretrained language models are typically trained on massive web-based datasets, which are often "contaminated" with downstream test sets. It is not clear to what extent models exploit the contaminated data for downstream tasks. We present a…

Computation and Language · Computer Science 2022-03-17 Inbal Magar , Roy Schwartz

Large language models are increasingly trained on all the data ever produced by humans. Many have raised concerns about the trustworthiness of public benchmarks due to potential contamination in pre-training or fine-tuning datasets. While…

Computation and Language · Computer Science 2023-11-14 Shuo Yang , Wei-Lin Chiang , Lianmin Zheng , Joseph E. Gonzalez , Ion Stoica

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

In recent years, Large Language Models have revolutionized the field of natural language processing, showcasing an impressive rise predominantly in English-centric domains. These advancements have set a global benchmark, inspiring…

Computation and Language · Computer Science 2024-05-06 Manel Aloui , Hasna Chouikhi , Ghaith Chaabane , Haithem Kchaou , Chehir Dhaouadi

Evaluating large language models (LLMs) is increasingly confounded by \emph{variant contamination}: the training corpus contains semantically equivalent yet lexically or syntactically altered versions of test items. Unlike verbatim leakage,…

Artificial Intelligence · Computer Science 2026-01-09 Renzhao Liang , Jingru Chen , Bo Jia , Bo Deng , Chenggang Xie , Yidong Wang , Ke Jin , Xin Wang , Linfeng Zhang , Cunxiang Wang

The success of Large Language Models (LLMs) relies heavily on the huge amount of pre-training data learned in the pre-training phase. The opacity of the pre-training process and the training data causes the results of many benchmark tests…

Computation and Language · Computer Science 2025-03-03 Shiwen Ni , Xiangtao Kong , Chengming Li , Xiping Hu , Ruifeng Xu , Jia Zhu , Min Yang

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

We are currently in an era of fierce competition among various large language models (LLMs) continuously pushing the boundaries of benchmark performance. However, genuinely assessing the capabilities of these LLMs has become a challenging…

Computation and Language · Computer Science 2024-06-04 Wenhong Zhu , Hongkun Hao , Zhiwei He , Yunze Song , Yumeng Zhang , Hanxu Hu , Yiran Wei , Rui Wang , Hongyuan Lu

Large language models (LLMs) are widely used, but concerns about data contamination challenge the reliability of LLM evaluations. Existing contamination detection methods are often task-specific or require extra prerequisites, limiting…

Computation and Language · Computer Science 2024-10-22 Yi Zhao , Jing Li , Linyi Yang

Large language models (LLMs) have demonstrated impressive reasoning abilities across a wide range of tasks, but data contamination undermines the objective evaluation of these capabilities. This problem is further exacerbated by malicious…

Machine Learning · Computer Science 2026-05-22 Yifan Lan , Yuanpu Cao , Hanyu Wang , Lu Lin , Jinghui Chen

Large Language Models (LLMs) have revolutionized code generation, achieving exceptional results on various established benchmarking frameworks. However, concerns about data contamination - where benchmark data inadvertently leaks into…

Hardware Architecture · Computer Science 2025-06-13 Zeng Wang , Minghao Shao , Jitendra Bhandari , Likhitha Mankali , Ramesh Karri , Ozgur Sinanoglu , Muhammad Shafique , Johann Knechtel

Machine Translation (MT) is widely employed to address resource scarcity in low-resource languages by generating synthetic data from high-resource counterparts. While sentiment preservation in translation has long been studied, a critical…

Computation and Language · Computer Science 2026-04-30 Mohsinul Kabir , Tasnim Ahmed , Md Mezbaur Rahman , Polydoros Giannouris , Sophia Ananiadou

In this paper, we show that knowledge distillation can be subverted to manipulate language model benchmark scores, revealing a critical vulnerability in current evaluation practices. We introduce "Data Laundering," a process that enables…

Computation and Language · Computer Science 2025-06-05 Jonibek Mansurov , Akhmed Sakip , Alham Fikri Aji

Recent generative large language models (LLMs) show remarkable performance in non-English languages, but when prompted in those languages they tend to express higher harmful social biases and toxicity levels. Prior work has shown that…

Computation and Language · Computer Science 2025-06-03 Vera Neplenbroek , Arianna Bisazza , Raquel Fernández

If LLM training data is polluted with benchmark test data, then benchmark performance gives biased estimates of out-of-distribution (OOD) generalization. Typical decontamination filters use n-gram matching which fail to detect semantic…

Machine Learning · Computer Science 2026-02-16 Ari Spiesberger , Juan J. Vazquez , Nicky Pochinkov , Tomáš Gavenčiak , Peli Grietzer , Gavin Leech , Nandi Schoots