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Models trained on different datasets can be merged by a weighted-averaging of their parameters, but why does it work and when can it fail? Here, we connect the inaccuracy of weighted-averaging to mismatches in the gradients and propose a…

Machine Learning · Computer Science 2024-08-26 Nico Daheim , Thomas Möllenhoff , Edoardo Maria Ponti , Iryna Gurevych , Mohammad Emtiyaz Khan

Model merging aims to integrate multiple expert models into a single model that inherits their complementary strengths without incurring the inference-time cost of ensembling. Recent progress has shown that merging can be highly effective…

Artificial Intelligence · Computer Science 2026-05-19 Shilian Chen , Jie Zhou , Qin Chen , Wen Wu , Xin Li , Qi Feng , Liang He

As specialized large language models (LLMs) become increasingly prevalent, model merging methods are being used to combine them to create a single multi-task model without requiring any additional data or training. However, these approaches…

Machine Learning · Computer Science 2025-03-11 Hetarth Chopra , Vidhi Rambhia , Vikram Adve

Model merging enables efficient multi-task models by combining task-specific fine-tuned checkpoints. However, storing multiple task-specific checkpoints requires significant memory, limiting scalability and restricting model merging to…

Machine Learning · Computer Science 2025-08-08 Youngeun Kim , Seunghwan Lee , Aecheon Jung , Bogon Ryu , Sungeun Hong

Model merging has shown great promise at combining expert models, but the benefit of merging is unclear when merging "generalist" models trained on many tasks. We explore merging in the context of large (~100B) models, by recycling…

Computation and Language · Computer Science 2025-02-05 Muhammad Khalifa , Yi-Chern Tan , Arash Ahmadian , Tom Hosking , Honglak Lee , Lu Wang , Ahmet Üstün , Tom Sherborne , Matthias Gallé

The rapid expansion of the open-source language model landscape presents an opportunity to merge the competencies of these model checkpoints by combining their parameters. Advances in transfer learning, the process of fine-tuning pretrained…

Computation and Language · Computer Science 2025-01-13 Charles Goddard , Shamane Siriwardhana , Malikeh Ehghaghi , Luke Meyers , Vlad Karpukhin , Brian Benedict , Mark McQuade , Jacob Solawetz

Globally operating enterprises selling large and complex products and services often have to deal with situations where variability models are locally developed to take into account the requirements of local markets. For example, cars sold…

Artificial Intelligence · Computer Science 2021-02-16 Mathias Uta , Alexander Felfernig , Gottfried Schenner , Johannes Spoecklberger

Transfer learning has become a powerful tool to initialize deep learning models to achieve faster convergence and higher performance. This is especially useful in the medical imaging analysis domain, where data scarcity limits possible…

Computer Vision and Pattern Recognition · Computer Science 2025-04-16 Ibrahim Almakky , Santosh Sanjeev , Anees Ur Rehman Hashmi , Mohammad Areeb Qazi , Hu Wang , Mohammad Yaqub

Model merging has emerged as an effective approach to combine multiple single-task models into a multitask model. This process typically involves computing a weighted average of the model parameters without any additional training. Existing…

Machine Learning · Computer Science 2025-04-28 Lu Li , Tianyu Zhang , Zhiqi Bu , Suyuchen Wang , Huan He , Jie Fu , Yonghui Wu , Jiang Bian , Yong Chen , Yoshua Bengio

Model merging is a flexible and computationally tractable approach to merge single-task checkpoints into a multi-task model. Prior work has solely focused on constrained multi-task settings where there is a one-to-one mapping between a…

Computer Vision and Pattern Recognition · Computer Science 2025-04-16 Juan Garcia Giraldo , Nikolaos Dimitriadis , Ke Wang , Pascal Frossard

With the development of large language models, fine-tuning has emerged as an effective method to enhance performance in specific scenarios by injecting domain-specific knowledge. In this context, model merging techniques provide a solution…

Computation and Language · Computer Science 2025-09-18 Zijian Li , Xiaocheng Feng , Huixin Liu , Yichong Huang , Ting Liu , Bing Qin

Model merging has attracted attention as an effective path toward multi-task adaptation by integrating knowledge from multiple task-specific models. Among existing approaches, dynamic merging mitigates performance degradation caused by…

Machine Learning · Computer Science 2026-05-01 Junqi Gao , Dazhi Zhang , Zhichang Guo , Biqing Qi , Yi Ran , Wangmeng Zuo

Model merging aims to combine multiple fine-tuned models into a single multi-task model without access to training data. Existing task-vector merging methods such as TIES, TSV-M, and Iso-C/CTS differ in their aggregation rules but treat all…

Computer Vision and Pattern Recognition · Computer Science 2026-02-11 Xinyu Wang , Ke Deng , Fei Dou , Jinbo Bi , Jin Lu

Model merging has emerged as a promising solution to accommodate multiple large models within constrained memory budgets. We present StatsMerging, a novel lightweight learning-based model merging method guided by weight distribution…

Machine Learning · Computer Science 2025-06-06 Ranjith Merugu , Bryan Bo Cao , Shubham Jain

Mixture of expert (MoE) models are a promising approach to increasing model capacity without increasing inference cost, and are core components of many state-of-the-art language models. However, current MoE models typically use only few…

Machine Learning · Computer Science 2025-07-31 Ryo Bertolissi , Jonas Hübotter , Ido Hakimi , Andreas Krause

Model ensemble is an effective strategy in continual learning, which alleviates catastrophic forgetting by interpolating model parameters, achieving knowledge fusion learned from different tasks. However, existing model ensemble methods…

Computer Vision and Pattern Recognition · Computer Science 2025-09-25 Yuchuan Mao , Zhi Gao , Xiaomeng Fan , Yuwei Wu , Yunde Jia , Chenchen Jing

Model merging has emerged as a promising technique for combining multiple fine-tuned models into a single multitask model without retraining. However, the factors that determine whether merging will succeed or fail remain poorly understood.…

Computation and Language · Computer Science 2026-01-13 Adir Rahamim , Asaf Yehudai , Boaz Carmeli , Leshem Choshen , Yosi Mass , Yonatan Belinkov

Recent research advocates deploying smaller, specialized code LLMs in agentic frameworks alongside frontier models, sparking interest in efficient strategies for multi-task learning that balance performance, constraints, and costs. We…

Computation and Language · Computer Science 2026-01-30 Mingzhi Zhu , Boris Sobolev , Rahul Krishna , Raju Pavuluri , Stacy Patterson , Michele Merler

Large language models, such as ChatGPT, Claude, or LLaMA, are gigantic, monolithic, and possess the superpower to simultaneously support thousands of tasks. However, high-throughput applications often prefer smaller task-specific models…

Computation and Language · Computer Science 2025-02-17 Haoyu Yang , Zheng Zhang , Saket Sathe

With the rapid growth of deep learning, there is an increasing availability of open-source models for various tasks. However, single fine-tuned models often fall short of meeting the diverse needs of users. Model merging has thus emerged as…

Computer Vision and Pattern Recognition · Computer Science 2025-07-29 Shenghe Zheng , Hongzhi Wang