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Post-training improves instruction-following and helpfulness of large language models (LLMs) but often reduces generation diversity, which leads to repetitive outputs in open-ended settings, a phenomenon known as mode collapse. Motivated by…

Computation and Language · Computer Science 2026-02-09 Bowen Zhang , Meiyi Wang , Harold Soh

This paper introduces LiNR, LinkedIn's large-scale, GPU-based retrieval system. LiNR supports a billion-sized index on GPU models. We discuss our experiences and challenges in creating scalable, differentiable search indexes using…

Reinforcement Learning (RL) is increasingly utilized to enhance the reasoning capabilities of Large Language Models (LLMs). However, effectively scaling these RL methods presents significant challenges, primarily due to the difficulty in…

Machine Learning · Computer Science 2025-09-30 Alexandre Piché , Ehsan Kamalloo , Rafael Pardinas , Xiaoyin Chen , Dzmitry Bahdanau

Transformer-based, pre-trained large language models (LLMs) have demonstrated outstanding performance across diverse domains, particularly in the emerging {\em pretrain-then-finetune} paradigm. Low-Rank Adaptation (LoRA), a…

Machine Learning · Computer Science 2024-09-19 Zhengmao Ye , Dengchun Li , Zetao Hu , Tingfeng Lan , Jian Sha , Sicong Zhang , Lei Duan , Jie Zuo , Hui Lu , Yuanchun Zhou , Mingjie Tang

Large language model (LLM) steering has emerged as a promising paradigm for controlling model behavior at inference time through targeted manipulation of hidden states, offering a lightweight alternative to expensive retraining. However,…

Computation and Language · Computer Science 2026-03-03 Haolei Xu , Xinyu Mei , Yuchen Yan , Rui Zhou , Wenqi Zhang , Weiming Lu , Yueting Zhuang , Yongliang Shen

Weight tying is widely used in compact language models to reduce parameters by sharing the token table between the input embedding and the output projection. However, parameter sharing alone does not guarantee a stable token interface:…

Computation and Language · Computer Science 2026-05-11 Jian Gu , Aldeida Aleti , Chunyang Chen , Hongyu Zhang

Large Language Models (LLMs) such as ChatGPT demonstrate strong few-shot adaptability without requiring fine-tuning, positioning them ideal for data-limited and real-time applications. However, this adaptability has not yet been replicated…

Computer Vision and Pattern Recognition · Computer Science 2024-12-04 Zixuan Hu , Yongxian Wei , Li Shen , Chun Yuan , Dacheng Tao

In recent years, large language models (LLMs) have driven substantial intelligent transformation across diverse industries. Commercial LLM training is typically performed over data center networks (DCNs) comprising hundreds to thousands of…

Networking and Internet Architecture · Computer Science 2026-03-20 Wenyi Wang , Zheng Wu , Yanmeng Wang , Haolin Mao , Lei Han , Gaogang Xie , Fu Xiao

Low-Rank Adapters (LoRAs) have transformed the fine-tuning of Large Language Models (LLMs) by enabling parameter-efficient updates. However, their widespread adoption remains limited by the reliance on GPU-based training. In this work, we…

Machine Learning · Computer Science 2025-07-03 Reza Arabpour , Haitz Sáez de Ocáriz Borde , Anastasis Kratsios

Computational notebooks (e.g., Jupyter, Google Colab) are widely used for interactive data science and machine learning. In those frameworks, users can start a session, then execute cells (i.e., a set of statements) to create variables,…

Databases · Computer Science 2025-03-12 Zhaoheng Li , Pranav Gor , Rahul Prabhu , Hui Yu , Yuzhou Mao , Yongjoo Park

With the rapid development of large language models (LLMs) and ever-evolving practical requirements, finding an efficient and effective alignment method has never been more critical. However, the tension between the complexity of current…

Computation and Language · Computer Science 2024-11-05 Jiaming Ji , Boyuan Chen , Hantao Lou , Donghai Hong , Borong Zhang , Xuehai Pan , Juntao Dai , Tianyi Qiu , Yaodong Yang

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

Training large Deep Neural Network (DNN) models requires thousands of GPUs over the course of several days or weeks. At this scale, failures are frequent and can have a big impact on training throughput. Utilizing spare GPU servers to…

Distributed, Parallel, and Cluster Computing · Computer Science 2024-09-27 Swapnil Gandhi , Mark Zhao , Athinagoras Skiadopoulos , Christos Kozyrakis

Large scale machine learning and deep models are extremely data-hungry. Unfortunately, obtaining large amounts of labeled data is expensive, and training state-of-the-art models (with hyperparameter tuning) requires significant computing…

Machine Learning · Computer Science 2021-06-15 Krishnateja Killamsetty , Durga Sivasubramanian , Ganesh Ramakrishnan , Rishabh Iyer

Training high-quality deep models necessitates vast amounts of data, resulting in overwhelming computational and memory demands. Recently, data pruning, distillation, and coreset selection have been developed to streamline data volume by…

Machine Learning · Computer Science 2024-10-18 Guibin Zhang , Haonan Dong , Yuchen Zhang , Zhixun Li , Dingshuo Chen , Kai Wang , Tianlong Chen , Yuxuan Liang , Dawei Cheng , Kun Wang

Fine-tuning large language models (LLMs) is computationally expensive, and Low-Rank Adaptation (LoRA) provides a cost-effective solution by approximating weight updates through low-rank matrices. In real-world scenarios, LLMs are fine-tuned…

Machine Learning · Computer Science 2025-06-03 Jinda Liu , Yi Chang , Yuan Wu

The rise of large language models (LLMs) has created new opportunities across various fields but has also introduced significant challenges in resource management. Current LLM serving systems face a fundamental tension: balancing serving…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-07-25 Jingfeng Wu , Yiyuan He , Minxian Xu , Xitong Gao , Kejiang Ye , Chengzhong Xu

Modern RL-based post-training for large language models (LLMs) co-locate trajectory sampling and policy optimisation on the same GPU cluster, forcing the system to switch between inference and training workloads. This serial context…

Machine Learning · Computer Science 2025-08-13 Jie Xiao , Changyuan Fan , Qingnan Ren , Alfred Long , Yuchen Zhang , Rymon Yu , Eric Yang , Lynn Ai , Shaoduo Gan

AfterLearnER (After Learning Evolutionary Retrofitting) consists in applying evolutionary optimization to refine fully trained machine learning models by optimizing a set of carefully chosen parameters or hyperparameters of the model, with…

Machine Learning · Computer Science 2025-11-17 Mathurin Videau , Mariia Zameshina , Alessandro Leite , Laurent Najman , Marc Schoenauer , Olivier Teytaud

Training modern LLMs is extremely resource intensive, and customizing them for various deployment scenarios characterized by limited compute and memory resources through repeated training is impractical. In this paper, we introduce…

Computation and Language · Computer Science 2024-08-29 Ruisi Cai , Saurav Muralidharan , Greg Heinrich , Hongxu Yin , Zhangyang Wang , Jan Kautz , Pavlo Molchanov