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The scaling of large language models (LLMs) has revolutionized their capabilities in various tasks, yet this growth must be matched with efficient computational strategies. The Mixture-of-Experts (MoE) architecture stands out for its…

Computation and Language · Computer Science 2025-03-20 Zihan Qiu , Zeyu Huang , Shuang Cheng , Yizhi Zhou , Zili Wang , Ivan Titov , Jie Fu

Recent studies have shown that combining parameter-efficient fine-tuning (PEFT) with mixture-of-experts (MoE) is an effective strategy for adapting large language models (LLMs) to the downstream tasks. However, most existing approaches rely…

Computation and Language · Computer Science 2026-02-25 Yuan Zhuang , Yi Shen , Yuexin Bian , Qing Su , Shihao Ji , Yuanyuan Shi , Fei Miao

Mixture of Experts (MoE) pretraining is more scalable than dense Transformer pretraining, because MoEs learn to route inputs to a sparse set of their feedforward parameters. However, this means that MoEs only receive a sparse backward…

Machine Learning · Computer Science 2025-11-05 Ashwinee Panda , Vatsal Baherwani , Zain Sarwar , Benjamin Therien , Sambit Sahu , Tom Goldstein , Supriyo Chakraborty

Mixture-of-Experts (MoE) models can scale parameter capacity by routing each token to a subset of experts through a learned gate function. While conditional routing reduces training costs, it shifts the burden on inference memory: expert…

Machine Learning · Computer Science 2025-10-07 Rana Shahout , Colin Cai , Yilun Du , Minlan Yu , Michael Mitzenmacher

Mixture-of-Experts (MoE) has emerged as an effective approach to reduce the computational overhead of Transformer architectures by sparsely activating a subset of parameters for each token while preserving high model capacity. This paradigm…

Computer Vision and Pattern Recognition · Computer Science 2026-03-31 Dohwan Ko , Jinyoung Park , Seoung Choi , Sanghyeok Lee , Seohyun Lee , Hyunwoo J. Kim

Mixture-of-Experts (MoE) enables efficient scaling of large language models (LLMs) with sparsely activated experts during inference. To effectively deploy large MoE models on memory-constrained devices, many systems introduce *expert…

Machine Learning · Computer Science 2026-03-03 Jingcong Liang , Siyuan Wang , Miren Tian , Yitong Li , Duyu Tang , Zhongyu Wei

Transformer-based Mixture-of-Experts (MoE) models have been driving several recent technological advancements in Natural Language Processing (NLP). These MoE models adopt a router mechanism to determine which experts to activate for routing…

Machine Learning · Computer Science 2024-09-11 Maryam Akhavan Aghdam , Hongpeng Jin , Yanzhao Wu

Mixture of Experts (MoE) are rising in popularity as a means to train extremely large-scale models, yet allowing for a reasonable computational cost at inference time. Recent state-of-the-art approaches usually assume a large number of…

Computer Vision and Pattern Recognition · Computer Science 2023-04-13 Amelie Royer , Ilia Karmanov , Andrii Skliar , Babak Ehteshami Bejnordi , Tijmen Blankevoort

The Mixture-of-Experts (MoE) architecture has enabled the creation of massive yet efficient Large Language Models (LLMs). However, the standard deterministic routing mechanism presents a significant limitation: its inherent brittleness is a…

Machine Learning · Computer Science 2025-09-30 Albus Yizhuo Li

Mixture-of-Experts (MoE) models are often interpreted by analysing which categories are routed to which experts. However, routing alone does not reveal what each expert actually encodes. We train sparsely-gated convolutional MoE models with…

Computer Vision and Pattern Recognition · Computer Science 2026-05-21 Gene Tangtartharakul , Katherine R. Storrs

This study investigates the behavior of model-integrated routers in Mixture of Experts (MoE) models, focusing on how tokens are routed based on their linguistic features, specifically Part-of-Speech (POS) tags. The goal is to explore across…

Computation and Language · Computer Science 2024-12-24 Elie Antoine , Frédéric Béchet , Philippe Langlais

Mixture-of-Experts (MoE) architectures have become standard in large language models, yet many of their core design choices - expert count, granularity, shared experts, load balancing, token dropping - have only been studied one or two at a…

Machine Learning · Computer Science 2026-05-13 Margaret Li , Sneha Kudugunta , Danielle Rothermel , Luke Zettlemoyer

In a distributed mixture-of-experts (MoE) system, a server collaborates with multiple specialized expert clients to perform inference. The server extracts features from input data and dynamically selects experts based on their areas of…

Machine Learning · Computer Science 2025-04-02 Qiuchen Song , Shusen Jing , Shuai Zhang , Songyang Zhang , Chuan Huang

Sparse Mixture of Experts (MoE) models are popular for training large language models due to their computational efficiency. However, the commonly used top-$k$ routing mechanism suffers from redundancy computation and memory costs due to…

Machine Learning · Computer Science 2024-02-22 Zhiyuan Zeng , Qipeng Guo , Zhaoye Fei , Zhangyue Yin , Yunhua Zhou , Linyang Li , Tianxiang Sun , Hang Yan , Dahua Lin , Xipeng Qiu

Mixture-of-Experts (MoE) has successfully scaled up models while maintaining nearly constant computing costs. By employing a gating network to route input tokens, it selectively activates a subset of expert networks to process the…

Machine Learning · Computer Science 2025-04-22 Mohan Zhang , Pingzhi Li , Jie Peng , Mufan Qiu , Tianlong Chen

Sparse mixture of experts (SMoE) offers an appealing solution to scale up the model complexity beyond the mean of increasing the network's depth or width. However, we argue that effective SMoE training remains challenging because of the…

Artificial Intelligence · Computer Science 2025-05-20 Nam V. Nguyen , Huy Nguyen , Quang Pham , Van Nguyen , Savitha Ramasamy , Nhat Ho

Mixture-of-Experts (MoE) models have demonstrated exceptional performance in large-scale language models. Existing routers typically rely on non-differentiable Top-$k$+Softmax, limiting their performance and scalability. We argue that two…

Supervised fine-tuning (SFT) is a milestone in aligning large language models with human instructions and adapting them to downstream tasks. In particular, Low-Rank Adaptation (LoRA) has gained widespread attention due to its parameter…

Computation and Language · Computer Science 2025-11-05 Jia-Chen Zhang , Yu-Jie Xiong , Xi-He Qiu , Chun-Ming Xia , Fei Dai , Zheng Zhou

To help the open-source community have a better understanding of Mixture-of-Experts (MoE) based large language models (LLMs), we train and release OpenMoE, a series of fully open-sourced and reproducible decoder-only MoE LLMs, ranging from…

Computation and Language · Computer Science 2024-03-28 Fuzhao Xue , Zian Zheng , Yao Fu , Jinjie Ni , Zangwei Zheng , Wangchunshu Zhou , Yang You

By routing input tokens to only a few split experts, Sparse Mixture-of-Experts has enabled efficient training of large language models. Recent findings suggest that fixing the routers can achieve competitive performance by alleviating the…