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Related papers: LoBAM: LoRA-Based Backdoor Attack on Model Merging

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Model merging for Large Language Models (LLMs) directly fuses the parameters of different models finetuned on various tasks, creating a unified model for multi-domain tasks. However, due to potential vulnerabilities in models available on…

Cryptography and Security · Computer Science 2025-05-30 Zenghui Yuan , Yangming Xu , Jiawen Shi , Pan Zhou , Lichao Sun

Fine-tuning pre-trained models for downstream tasks has led to a proliferation of open-sourced task-specific models. Recently, Model Merging (MM) has emerged as an effective approach to facilitate knowledge transfer among these…

Cryptography and Security · Computer Science 2024-09-04 Jinghuai Zhang , Jianfeng Chi , Zheng Li , Kunlin Cai , Yang Zhang , Yuan Tian

Finetuning LLMs with LoRA has gained significant popularity due to its simplicity and effectiveness. Often, users may even find pluggable, community-shared LoRAs to enhance their base models for a specific downstream task of interest;…

Fine-tuning large language models (LMs) for individual tasks yields strong performance but is expensive for deployment and storage. Recent works explore model merging to combine multiple task-specific models into a single multi-task model…

Computation and Language · Computer Science 2025-05-30 Haobo Zhang , Jiayu Zhou

Model merging has gained significant attention as a cost-effective approach to integrate multiple single-task fine-tuned models into a unified one that can perform well on multiple tasks. However, existing model merging techniques primarily…

Cryptography and Security · Computer Science 2025-02-28 Jinluan Yang , Anke Tang , Didi Zhu , Zhengyu Chen , Li Shen , Fei Wu

Model merging has emerged as a powerful technique for combining specialized capabilities from multiple fine-tuned LLMs without additional training costs. However, the security implications of this widely-adopted practice remain critically…

Cryptography and Security · Computer Science 2026-04-02 Jiaqing Li , Zhibo Zhang , Shide Zhou , Yuxi Li , Tianlong Yu , Kailong Wang

Low-Rank Adaptation (LoRA) has emerged as an efficient method for fine-tuning large language models (LLMs) and is widely adopted within the open-source community. However, the decentralized dissemination of LoRA adapters through platforms…

Cryptography and Security · Computer Science 2025-12-23 Linzhi Chen , Yang Sun , Hongru Wei , Yuqi Chen

Large language models (LLMs) have demonstrated superior performance compared to previous methods on various tasks, and often serve as the foundation models for many researches and services. However, the untrustworthy third-party LLMs may…

Cryptography and Security · Computer Science 2024-04-02 Hai Huang , Zhengyu Zhao , Michael Backes , Yun Shen , Yang Zhang

The democratization of pre-trained language models through open-source initiatives has rapidly advanced innovation and expanded access to cutting-edge technologies. However, this openness also brings significant security risks, including…

Computation and Language · Computer Science 2024-06-04 Ansh Arora , Xuanli He , Maximilian Mozes , Srinibas Swain , Mark Dras , Qiongkai Xu

Model merging has emerged as a crucial technique in Deep Learning, enabling the integration of multiple models into a unified system while preserving perfor-mance and scalability. In this respect, the compositional properties of low-rank…

Machine Learning · Computer Science 2025-03-11 Riccardo Salami , Pietro Buzzega , Matteo Mosconi , Jacopo Bonato , Luigi Sabetta , Simone Calderara

Low-Rank Adaptation (LoRA) has emerged as a leading technique for efficiently fine-tuning text-to-image diffusion models, and its widespread adoption on open-source platforms has fostered a vibrant culture of model sharing and…

Computer Vision and Pattern Recognition · Computer Science 2026-04-27 Liangwei Lyu , Jiaqi Xu , Jianwei Ding , Qiyao Deng

Low-Rank Adaptation (LoRA) is a popular technique for parameter-efficient fine-tuning of Large Language Models (LLMs). We study how different LoRA modules can be merged to achieve skill composition -- testing the performance of the merged…

Computation and Language · Computer Science 2024-12-03 Akshara Prabhakar , Yuanzhi Li , Karthik Narasimhan , Sham Kakade , Eran Malach , Samy Jelassi

Federated Learning (FL) has received increasing attention due to its privacy protection capability. However, the base algorithm FedAvg is vulnerable when it suffers from so-called backdoor attacks. Former researchers proposed several robust…

Cryptography and Security · Computer Science 2022-12-29 Jianyi Zhang , Fangjiao Zhang , Qichao Jin , Zhiqiang Wang , Xiaodong Lin , Xiali Hei

Merging Large Language Models (LLMs) is a cost-effective technique for combining multiple expert LLMs into a single versatile model, retaining the expertise of the original ones. However, current approaches often overlook the importance of…

Computation and Language · Computer Science 2024-06-21 Hasan Abed Al Kader Hammoud , Umberto Michieli , Fabio Pizzati , Philip Torr , Adel Bibi , Bernard Ghanem , Mete Ozay

Model Merging (MM) has emerged as a promising alternative to multi-task learning, where multiple fine-tuned models are combined, without access to tasks' training data, into a single model that maintains performance across tasks. Recent…

Machine Learning · Computer Science 2025-09-30 Ankit Gangwal , Aaryan Ajay Sharma

Large models adaptation through Federated Learning (FL) addresses a wide range of use cases and is enabled by Parameter-Efficient Fine-Tuning techniques such as Low-Rank Adaptation (LoRA). However, this distributed learning paradigm faces…

Machine Learning · Computer Science 2026-02-19 Bastien Vuillod , Pierre-Alain Moellic , Jean-Max Dutertre

Model merging aims to combine multiple fine-tuned models into a single set of weights that performs well across all source tasks. While prior work has shown that merging can approximate the performance of individual fine-tuned models for…

Machine Learning · Computer Science 2025-10-17 Mohammadsajad Alipour , Mohammad Mohammadi Amiri

Large Language Models (LLMs), which bridge the gap between human language understanding and complex problem-solving, achieve state-of-the-art performance on several NLP tasks, particularly in few-shot and zero-shot settings. Despite the…

Cryptography and Security · Computer Science 2025-01-07 Shuai Zhao , Meihuizi Jia , Zhongliang Guo , Leilei Gan , Xiaoyu Xu , Xiaobao Wu , Jie Fu , Yichao Feng , Fengjun Pan , Luu Anh Tuan

In this paper, we address the challenges associated with merging low-rank adaptations of large neural networks. With the rise of parameter-efficient adaptation techniques, such as Low-Rank Adaptation (LoRA), model fine-tuning has become…

Computer Vision and Pattern Recognition · Computer Science 2026-02-02 Aniello Panariello , Daniel Marczak , Simone Magistri , Angelo Porrello , Bartłomiej Twardowski , Andrew D. Bagdanov , Simone Calderara , Joost van de Weijer

Model merging (MM) recently emerged as an effective method for combining large deep learning models. However, it poses significant security risks. Recent research shows that it is highly susceptible to backdoor attacks, which introduce a…

Machine Learning · Computer Science 2025-10-10 Stanisław Pawlak , Jan Dubiński , Daniel Marczak , Bartłomiej Twardowski
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