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A fine-grained data recipe is crucial for pre-training large language models, as it can significantly enhance training efficiency and model performance. One important ingredient in the recipe is to select samples based on scores produced by…

Computation and Language · Computer Science 2026-01-01 Ziqing Fan , Yuqiao Xian , Yan Sun , Li Shen

Quality and diversity are two critical metrics for the training data of large language models (LLMs), positively impacting performance. Existing studies often optimize these metrics separately, typically by first applying quality filtering…

Computation and Language · Computer Science 2025-04-29 Fengze Liu , Weidong Zhou , Binbin Liu , Zhimiao Yu , Yifan Zhang , Haobin Lin , Yifeng Yu , Bingni Zhang , Xiaohuan Zhou , Taifeng Wang , Yong Cao

Oversampling is one of the most widely used approaches for addressing imbalanced classification. The core idea is to generate additional minority samples to rebalance the dataset. Most existing methods, such as SMOTE, require converting…

Machine Learning · Computer Science 2025-10-14 Dang Nguyen , Sunil Gupta , Kien Do , Thin Nguyen , Taylor Braund , Alexis Whitton , Svetha Venkatesh

The training of large language models (LLMs) is expensive. In this paper, we study data-efficient approaches for pre-training LLMs, i.e., techniques that aim to optimize the Pareto frontier of model quality and training resource/data…

This research explores a hybrid approach to fine-tuning large language models (LLMs) by integrating real-world and synthetic data to boost model performance, particularly in generating accurate and contextually relevant responses. By…

Computation and Language · Computer Science 2024-10-15 Alexey Zhezherau , Alexei Yanockin

Large foundation models are typically trained on data from multiple domains, with the data mixture--the proportion of each domain used--playing a critical role in model performance. The standard approach to selecting this mixture relies on…

Machine Learning · Computer Science 2025-10-03 Mustafa Shukor , Louis Bethune , Dan Busbridge , David Grangier , Enrico Fini , Alaaeldin El-Nouby , Pierre Ablin

The rise of Large Language Models (LLMs) has accentuated the need for diverse, high-quality pre-training data. Synthetic data emerges as a viable solution to the challenges of data scarcity and inaccessibility. While previous literature has…

Computation and Language · Computer Science 2024-10-24 Hao Chen , Abdul Waheed , Xiang Li , Yidong Wang , Jindong Wang , Bhiksha Raj , Marah I. Abdin

Pretraining datasets for large language models (LLMs) have grown to trillions of tokens composed of large amounts of CommonCrawl (CC) web scrape along with smaller, domain-specific datasets. It is expensive to understand the impact of these…

Machine Learning · Computer Science 2024-06-06 Cody Blakeney , Mansheej Paul , Brett W. Larsen , Sean Owen , Jonathan Frankle

Large language models (LLMs) are commonly trained on multi-domain datasets, where domain sampling strategies significantly impact model performance due to varying domain importance across downstream tasks. Existing approaches for optimizing…

Computation and Language · Computer Science 2025-08-25 Weijie Shi , Jipeng Zhang , Yaguang Wu , Jingzhi Fang , Ruiyuan Zhang , Jiajie Xu , Jia Zhu , Hao Chen , Yao Zhao , Sirui Han , Xiaofang Zhou

Optimizing data mixtures is essential for unlocking the full potential of large language models (LLMs), yet identifying the optimal composition remains computationally prohibitive due to reliance on heuristic trials or expensive proxy…

Machine Learning · Computer Science 2026-01-27 Jiapeng Wang , Changxin Tian , Kunlong Chen , Ziqi Liu , Jiaxin Mao , Wayne Xin Zhao , Zhiqiang Zhang , Jun Zhou

Multi-domain fine-tuning of large language models requires improving performance on target domains while preserving performance on constrained domains, such as general knowledge, instruction following, or safety evaluations. Existing data…

Machine Learning · Computer Science 2026-05-12 Eleonora Gualdoni , Sonia Laguna , Louis Bethune , Joao Monteiro , Pierre Ablin , Marco Cuturi

Data augmentation plays a crucial role in enhancing the robustness and performance of machine learning models across various domains. In this study, we introduce a novel mixed-sample data augmentation method called RandoMix. RandoMix is…

Computer Vision and Pattern Recognition · Computer Science 2023-12-01 Xiaoliang Liu , Furao Shen , Jian Zhao , Changhai Nie

The performance emergence of large language models (LLMs) driven by data scaling laws makes the selection of pre-training data increasingly important. However, existing methods rely on limited heuristics and human intuition, lacking…

Computation and Language · Computer Science 2025-04-09 Ru Peng , Kexin Yang , Yawen Zeng , Junyang Lin , Dayiheng Liu , Junbo Zhao

Finetuning on domain-specific data is a well-established method for enhancing LLM performance on downstream tasks. Training on each dataset produces a new set of model weights, resulting in a multitude of checkpoints saved in-house or on…

Machine Learning · Computer Science 2026-03-12 Sofia Maria Lo Cicero Vaina , Artem Chumachenko , Max Ryabinin

Large Language Models (LLMs) have shown remarkable ability to generalize effectively across numerous industry domains while executing a range of tasks. Many of these competencies are obtained from the data utilized during the pre-training…

Data-centric training has emerged as a promising direction for improving large language models (LLMs) by optimizing not only model parameters but also the selection, composition, and weighting of training data during optimization. However,…

In the training of large deep neural networks, there is a need for vast amounts of training data. To meet this need, data is collected from multiple domains, such as Wikipedia and GitHub. These domains are heterogeneous in both data quality…

Machine Learning · Computer Science 2025-11-11 Mahdi Salmani , Pratik Worah , Meisam Razaviyayn , Vahab Mirrokni

Finetuning large language models on instruction data is crucial for enhancing pre-trained knowledge and improving instruction-following capabilities. As instruction datasets proliferate, selecting optimal data for effective training becomes…

Computation and Language · Computer Science 2024-09-18 Simon Yu , Liangyu Chen , Sara Ahmadian , Marzieh Fadaee

Adapting general large language models (LLMs) to specialized domains presents great challenges due to varied data distributions. This adaptation typically requires continual pre-training on massive domain-specific corpora to facilitate…

Computation and Language · Computer Science 2024-07-16 Jinhao Jiang , Junyi Li , Wayne Xin Zhao , Yang Song , Tao Zhang , Ji-Rong Wen

Large Language Models have demonstrated remarkable progress in general-purpose capabilities and can achieve strong performance in specific domains through fine-tuning on domain-specific data. However, acquiring high-quality data for target…

Artificial Intelligence · Computer Science 2026-05-29 Tong Ye , Hang Yu , Tengfei Ma , Xuhong Zhang , Jianguo Li , Peng Di , Peiyu Liu , Jianwei Yin , Wenhai Wang