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We consider online convex optimization (OCO) over a heterogeneous network with communication delay, where multiple workers together with a master execute a sequence of decisions to minimize the accumulation of time-varying global costs. The…

Information Theory · Computer Science 2021-07-15 Juncheng Wang , Ben Liang , Min Dong , Gary Boudreau , Hatem Abou-zeid

Traditional deep learning relies on end-to-end backpropagation for training, but it suffers from drawbacks such as high memory consumption and not aligning with biological neural networks. Recent advancements have introduced locally…

Computer Vision and Pattern Recognition · Computer Science 2024-07-10 Junhao Su , Chenghao He , Feiyu Zhu , Xiaojie Xu , Dongzhi Guan , Chenyang Si

Existing alignment techniques for Large Language Models (LLMs), such as Direct Preference Optimization (DPO), typically treat the model as a monolithic entity, applying uniform optimization pressure across all layers. This approach…

Computation and Language · Computer Science 2025-10-15 Yukun Zhang , Qi Dong

Retrieval-Augmented Generation (RAG) has revolutionized natural language processing by dynamically integrating external knowledge into Large Language Models (LLMs), addressing their limitation of static training datasets. Recent…

Computation and Language · Computer Science 2024-09-05 Krish Goel , Mahek Chandak

Distributed Deep Learning (DDL) is essential for large-scale Deep Learning (DL) training. Synchronous Stochastic Gradient Descent (SSGD) 1 is the de facto DDL optimization method. Using a sufficiently large batch size is critical to…

Machine Learning · Computer Science 2021-12-03 Wei Zhang , Mingrui Liu , Yu Feng , Xiaodong Cui , Brian Kingsbury , Yuhai Tu

Heterogeneity in federated learning (FL) is a critical and challenging aspect that significantly impacts model performance and convergence. In this paper, we propose a novel framework by formulating heterogeneous FL as a hierarchical…

Optimization and Control · Mathematics 2025-09-11 Yuyang Qiu , Kibaek Kim , Farzad Yousefian

Large Language Models (LLMs) have revolutionized natural language processing by understanding and generating human-like text. However, the increasing demand for more sophisticated LLMs presents significant computational challenges due to…

Computation and Language · Computer Science 2025-01-14 Ze Yang , Yihong Jin , Xinhe Xu

Scaling up Large Language Model(LLM) training involves fitting a tremendous amount of training parameters across a limited number of workers. However, methods like ZeRO-3 that drastically reduce GPU memory pressure often incur heavy…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-02-05 Lang Xu , Quentin Anthony , Jacob Hatef , Aamir Shafi , Hari Subramoni , Dhabaleswar K. , Panda

Federated learning (FL) is a distributed Machine Learning (ML) framework that is capable of training a new global model by aggregating clients' locally trained models without sharing users' original data. Federated learning as a service…

Distributed, Parallel, and Cluster Computing · Computer Science 2024-10-15 Wentao Gao , Omid Tavallaie , Shuaijun Chen , Albert Zomaya

Federated learning (FL) is a new machine learning framework which trains a joint model across a large amount of decentralized computing devices. Existing methods, e.g., Federated Averaging (FedAvg), are able to provide an optimization…

Machine Learning · Computer Science 2021-02-15 Xingyu Li , Zhe Qu , Bo Tang , Zhuo Lu

Federated Learning (FL) has gained increasing interest in recent years as a distributed on-device learning paradigm. However, multiple challenges remain to be addressed for deploying FL in real-world Internet-of-Things (IoT) networks with…

Machine Learning · Computer Science 2023-04-12 Xiaofan Yu , Ludmila Cherkasova , Harsh Vardhan , Quanling Zhao , Emily Ekaireb , Xiyuan Zhang , Arya Mazumdar , Tajana Rosing

Simultaneous speech translation (SST) generates translations while receiving partial speech input. Recent advances show that large language models (LLMs) can substantially improve SST quality, but at the cost of high computational overhead.…

Computation and Language · Computer Science 2026-04-24 Siqi Ouyang , Shuoyang Ding , Oleksii Hrinchuk , Vitaly Lavrukhin , Brian Yan , Boris Ginsburg , Lei Li

Large Language Models (LLMs) have recently emerged as effective surrogate models and candidate generators within global optimization frameworks for expensive blackbox functions. Despite promising results, LLM-based methods often struggle in…

Machine Learning · Computer Science 2026-01-28 Andrej Schwanke , Lyubomir Ivanov , David Salinas , Fabio Ferreira , Aaron Klein , Frank Hutter , Arber Zela

Since the introduction of the GRPO algorithm, reinforcement learning (RL) has attracted increasing attention for LLM post-training, yet training efficiency remains a critical challenge. In mainstream RL frameworks, inference and training…

Machine Learning · Computer Science 2026-05-05 Jian Lu

To alleviate hardware scarcity in training large deep neural networks (DNNs), particularly large language models (LLMs), we present FusionLLM, a decentralized training system designed and implemented for training DNNs using geo-distributed…

Distributed, Parallel, and Cluster Computing · Computer Science 2024-10-17 Zhenheng Tang , Xueze Kang , Yiming Yin , Xinglin Pan , Yuxin Wang , Xin He , Qiang Wang , Rongfei Zeng , Kaiyong Zhao , Shaohuai Shi , Amelie Chi Zhou , Bo Li , Bingsheng He , Xiaowen Chu

Federated Learning (FL) is a promising distributed machine learning framework that allows collaborative learning of a global model across decentralized devices without uploading their local data. However, in real-world FL scenarios, the…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-03-11 Md Sirajul Islam , Sanjeev Panta , Fei Xu , Xu Yuan , Li Chen , Nian-Feng Tzeng

Special-purpose hardware accelerators are increasingly pivotal for sustaining performance improvements in emerging applications, especially as the benefits of technology scaling continue to diminish. However, designers currently lack…

Programming Languages · Computer Science 2024-04-09 Hongzheng Chen , Niansong Zhang , Shaojie Xiang , Zhichen Zeng , Mengjia Dai , Zhiru Zhang

Overlapping communication with computation is crucial for distributed large-model training, yet optimizing it - especially when computation becomes the bottleneck-remains challenging. We present Lagom, a system that co-tunes communication…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-02-25 Guanbin Xu , ZhenGuo Xu , Yuzhe Li , Youhui Bai , Ping Gong , Chaoyi Ruan , Cheng Li

Pretraining large language models (LLMs) typically requires centralized clusters with thousands of high-memory GPUs (e.g., H100/A100). Recent decentralized training methods reduce communication overhead by employing federated optimization;…

Computation and Language · Computer Science 2026-05-05 Jinrui Zhang , Chaodong Xiao , Aoqi Wu , Xindong Zhang , Lei Zhang

Communication is a major bottleneck in distributed learning, especially in large-scale settings and in federated learning environments with slow links. Three standard ways to reduce this cost are communication compression, local training,…

Machine Learning · Computer Science 2026-05-21 Yassine Maziane , Ammar Mahran , Artavazd Maranjyan , Peter Richtárik