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Large Language Models (LLMs) have demonstrated remarkable effectiveness in adapting to downstream tasks through fine-tuning. Federated Learning (FL) extends this capability by enabling collaborative fine-tuning across distributed clients…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-02-20 Zikai Zhang , Rui Hu , Jiahao Xu

Parameter-efficient fine-tuning techniques such as low-rank adaptation (LoRA) enable large language models (LLMs) to adapt to downstream tasks efficiently. Federated learning (FL) further facilitates this process by enabling collaborative…

Machine Learning · Computer Science 2026-03-09 Chuiyang Meng , Ming Tang , Vincent W. S. Wong

Transfer learning via fine-tuning pre-trained transformer models has gained significant success in delivering state-of-the-art results across various NLP tasks. In the absence of centralized data, Federated Learning (FL) can benefit from…

Low-Rank Adaptation (LoRA) has become ubiquitous for efficiently fine-tuning foundation models. However, federated fine-tuning using LoRA is challenging due to suboptimal updates arising from traditional federated averaging of individual…

Machine Learning · Computer Science 2025-10-07 Raghav Singhal , Kaustubh Ponkshe , Rohit Vartak , Lav R. Varshney , Praneeth Vepakomma

Federated Learning (FL) has emerged as a promising approach for privacy-preserving model training across decentralized devices. However, it faces challenges such as statistical heterogeneity and susceptibility to adversarial attacks, which…

Machine Learning · Computer Science 2024-12-13 Jialuo He , Wei Chen , Xiaojin Zhang

Federated learning (FL) aims to train machine learning models in the decentralized system consisting of an enormous amount of smart edge devices. Federated averaging (FedAvg), the fundamental algorithm in FL settings, proposes on-device…

Machine Learning · Computer Science 2020-12-17 Xin Yao , Tianchi Huang , Rui-Xiao Zhang , Ruiyu Li , Lifeng Sun

Large Language Models (LLMs) have demonstrated impressive capabilities across various tasks, but fine-tuning them for domain-specific applications often requires substantial domain-specific data that may be distributed across multiple…

Machine Learning · Computer Science 2025-10-13 Lei Wang , Jieming Bian , Letian Zhang , Jie Xu

This paper revisits alternating low-rank updates for federated fine-tuning and examines their behavior in decentralized federated learning (DFL). While alternating the LoRA matrices has been shown to stabilize aggregation in centralized FL,…

Machine Learning · Computer Science 2025-11-25 Xiaoyu Wang , Xiaotian Li , Zhixiang Zhou , Chen Li , Yong Liu

Federated learning (FL) enables multiple clients to collaboratively train models without sharing their local data, and becomes an important privacy-preserving machine learning framework. However, classical FL faces serious security and…

Cryptography and Security · Computer Science 2023-07-27 Jingwei Yi , Fangzhao Wu , Huishuai Zhang , Bin Zhu , Tao Qi , Guangzhong Sun , Xing Xie

Federated efficient fine-tuning has emerged as an approach that leverages distributed data and computational resources across nodes to address the challenges of large-scale fine-tuning and privacy preservation. The Low-Rank Adaptation…

Machine Learning · Computer Science 2025-10-14 Jianzhe Zhao , Hailin Zhu , Yu Zhang , Ziqi Chen , Guibing Guo

Federated fine-tuning of foundation models with Low-Rank Adaptation (LoRA) provides an efficient solution for reducing communication and computation costs while preserving data locality. However, the direct combination of FedAvg and LoRA…

Computer Vision and Pattern Recognition · Computer Science 2026-05-29 Zehao Wang , Guanglei Yang , Yihan Zeng , Hang Xu , Hongzhi Zhang , Wangmeng Zuo , Chun-Mei Feng

Low-Rank Adaptation (LoRA) is widely used for federated fine-tuning. Yet under non-IID settings, it can substantially underperform full-parameter fine-tuning. Through with-high-probability robustness analysis, we uncover that this gap can…

Machine Learning · Computer Science 2026-02-03 Hongyi Peng , Han Yu , Xiaoxiao Li , Qiang Yang

Federated learning (FL) has emerged as a powerful approach to safeguard data privacy by training models across distributed edge devices without centralizing local data. Despite advancements in homogeneous data scenarios, maintaining…

Computer Vision and Pattern Recognition · Computer Science 2024-11-26 Yuting Ma , Shengeng Tang , Xiaohua Xu , Lechao Cheng

Low-Rank Adaptation (LoRA) methods have gained popularity in efficient parameter fine-tuning of models containing hundreds of billions of parameters. In this work, instead, we demonstrate the application of LoRA methods to train…

Machine Learning · Computer Science 2024-06-27 Lucas Grativol Ribeiro , Mathieu Leonardon , Guillaume Muller , Virginie Fresse , Matthieu Arzel

Federated Learning (FL) with Low-Rank Adaptation (LoRA) has become a standard for privacy-preserving LLM fine-tuning. However, existing personalized methods predominantly operated under a restrictive Flat-Model Assumption: they addressed…

Machine Learning · Computer Science 2026-05-27 Jieming Bian , Lei Wang , Letian Zhang , Jie Xu

We address the relatively unexplored problem of hyper-parameter optimization (HPO) for federated learning (FL-HPO). We introduce Federated Loss SuRface Aggregation (FLoRA), a general FL-HPO solution framework that can address use cases of…

Machine Learning · Computer Science 2022-02-18 Yi Zhou , Parikshit Ram , Theodoros Salonidis , Nathalie Baracaldo , Horst Samulowitz , Heiko Ludwig

Decentralized federated learning (DFL) based on low-rank adaptation (LoRA) enables mobile devices with multi-task datasets to collaboratively fine-tune a large language model (LLM) by exchanging locally updated parameters with a subset of…

Machine Learning · Computer Science 2026-02-25 Nuocheng Yang , Sihua Wang , Ouwen Huan , Mingzhe Chen , Tony Q. S. Quek , Changchuan Yin

The federated learning (FL) framework trains a machine learning model using decentralized data stored at edge client devices by periodically aggregating locally trained models. Popular optimization algorithms of FL use vanilla (stochastic)…

Machine Learning · Computer Science 2021-06-07 Jianyu Wang , Zheng Xu , Zachary Garrett , Zachary Charles , Luyang Liu , Gauri Joshi

Fine-tuning large language models (LLMs) in federated settings enables privacy-preserving adaptation but suffers from cross-client interference due to model aggregation. Existing federated LoRA fine-tuning methods, primarily based on…

Machine Learning · Computer Science 2025-11-17 Jieming Bian , Lei Wang , Letian Zhang , Jie Xu

We investigate LoRA in federated learning through the lens of the asymmetry analysis of the learned $A$ and $B$ matrices. In doing so, we uncover that $A$ matrices are responsible for learning general knowledge, while $B$ matrices focus on…

Machine Learning · Computer Science 2025-03-24 Pengxin Guo , Shuang Zeng , Yanran Wang , Huijie Fan , Feifei Wang , Liangqiong Qu