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We propose Speculative Decoding (SpecDec), for the first time ever, to formally study exploiting the idea of speculative execution to accelerate autoregressive (AR) decoding. Speculative Decoding has two innovations: Spec-Drafter -- an…

Computation and Language · Computer Science 2023-10-31 Heming Xia , Tao Ge , Peiyi Wang , Si-Qing Chen , Furu Wei , Zhifang Sui

Speculative decoding is a widely used method that accelerates the generation process of large language models (LLMs) with no compromise in model performance. It achieves this goal by using an existing smaller model for drafting and then…

Computation and Language · Computer Science 2024-10-16 Weilin Zhao , Yuxiang Huang , Xu Han , Wang Xu , Chaojun Xiao , Xinrong Zhang , Yewei Fang , Kaihuo Zhang , Zhiyuan Liu , Maosong Sun

Speculative Decoding (SD) is a key technique for accelerating Large Language Model (LLM) inference, but it typically requires training a draft model on a large dataset. We approach this problem from a data-centric perspective, finding that…

Computation and Language · Computer Science 2026-02-19 Jiaming Fan , Daming Cao , Xiangzhong Luo , Jiale Fu , Chonghan Liu , Xu Yang

Reasoning models excel by generating long chain-of-thoughts, but decoding the resulting thousands of tokens is slow. Token-level speculative decoding (SD) helps, but its benefit is capped, because the chance that an entire $\gamma$-token…

Machine Learning · Computer Science 2025-06-25 Yichao Fu , Rui Ge , Zelei Shao , Zhijie Deng , Hao Zhang

The computational cost of training multimodal large language models (MLLMs) grows rapidly with the number of processed tokens. Existing efficiency methods mainly target inference via token reduction or merging, offering limited benefits…

Computer Vision and Pattern Recognition · Computer Science 2026-04-30 Chaoyu Li , Yogesh Kulkarni , Pooyan Fazli

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

Transformer-based autoregressive sampling has been the major bottleneck for slowing down large language model inferences. One effective way to accelerate inference is \emph{Speculative Decoding}, which employs a small model to sample a…

Machine Learning · Computer Science 2024-11-05 Ming Yin , Minshuo Chen , Kaixuan Huang , Mengdi Wang

Transformer language models generate text autoregressively, making inference latency proportional to the number of tokens generated. Speculative decoding reduces this latency without sacrificing output quality, by leveraging a small draft…

Machine Learning · Computer Science 2025-10-24 Clara Mohri , Haim Kaplan , Tal Schuster , Yishay Mansour , Amir Globerson

Speculative decoding accelerates LLM inference by verifying candidate tokens from a draft model against a larger target model. Recent judge decoding boosts this process by relaxing verification criteria by accepting draft tokens that may…

Computation and Language · Computer Science 2026-05-28 Kanghoon Yoon , Minsub Kim , Sungjae Lee , Joonhyung Lee , Sunghyeon Woo , Yeonjun In , Se Jung Kwon , Chanyoung Park , Dongsoo Lee

Speculative decoding is an inference-acceleration method for large language models (LLMs) where a small language model generates a draft-token sequence which is further verified by the target LLM in parallel. Recent works have advanced this…

Machine Learning · Computer Science 2024-03-06 Wonseok Jeon , Mukul Gagrani , Raghavv Goel , Junyoung Park , Mingu Lee , Christopher Lott

Large language models (LLMs) exhibit remarkable reasoning capabilities across diverse downstream tasks. However, their autoregressive nature leads to substantial inference latency, posing challenges for real-time applications. Speculative…

Computation and Language · Computer Science 2025-06-18 Tao He , Guang Huang , Yu Yang , Tianshi Xu , Sicheng Zhao , Guiguang Ding , Pengyang Wang , Feng Tian

Cascades and speculative decoding are two common approaches to improving language models' inference efficiency. Both approaches involve interleaving models of different sizes, but via fundamentally distinct mechanisms: cascades employ a…

Computation and Language · Computer Science 2024-10-23 Harikrishna Narasimhan , Wittawat Jitkrittum , Ankit Singh Rawat , Seungyeon Kim , Neha Gupta , Aditya Krishna Menon , Sanjiv Kumar

Speculative decoding (SD) accelerates large language model (LLM) inference by using a smaller model to draft future tokens, which are then verified by the target LLM. This preserves generation quality by accepting only aligned tokens.…

Computation and Language · Computer Science 2026-04-08 Taehyeon Kim , Hojung Jung , Se-Young Yun

Ensembles of generative large language models (LLMs) are a promising way to compensate for individual model limitations, integrating the strengths of different LLMs. Existing LLM ensemble methods, however, face limitations such as…

Computation and Language · Computer Science 2026-03-09 Bo Lv , Nayu Liu , Chen Tang , Xin Liu , Yue Yu , Ping Luo

Speculative decoding is a technique that uses multiple language models to accelerate infer- ence. Previous works have used an experi- mental approach to optimize the throughput of the inference pipeline, which involves LLM training and can…

Computation and Language · Computer Science 2026-03-13 Amirhossein Bozorgkhoo , Igor Molybog

Despite their strong performance on reasoning tasks, large reasoning models (LRMs) often suffer from overthinking, producing unnecessarily long outputs and incurring high end-to-end latency, a significant limitation to their real-world…

Artificial Intelligence · Computer Science 2025-10-22 Rubing Yang , Huajun Bai , Song Liu , Guanghua Yu , Runzhi Fan , Yanbin Dang , Jiejing Zhang , Kai Liu , Jianchen Zhu , Peng Chen

Speculative decoding has emerged as a powerful approach to accelerate large language model (LLM) inference by employing lightweight draft models to propose candidate tokens that are subsequently verified by the target model. The…

Computation and Language · Computer Science 2026-04-22 Zongyue Qin , Raghavv Goel , Mukul Gagrani , Risheek Garrepalli , Mingu Lee , Yizhou Sun

Large Language Models (LLMs) have become essential in advancing natural language processing (NLP) tasks, but their sequential token generation limits inference speed. Multi-Draft Speculative Decoding (MDSD) offers a promising solution by…

Computation and Language · Computer Science 2024-11-11 Ryan Sun , Tianyi Zhou , Xun Chen , Lichao Sun

The acceleration of Large Language Models (LLMs) with speculative decoding provides a significant runtime improvement without any loss of accuracy. Currently, EAGLE-2 is the state-of-the-art speculative decoding method, improving on EAGLE…

Computation and Language · Computer Science 2024-09-04 Oscar Brown , Zhengjie Wang , Andrea Do , Nikhil Mathew , Cheng Yu

Decoding from large language models (LLMs) typically relies on fixed sampling hyperparameters (e.g., temperature, top-p), despite substantial variation in task difficulty and uncertainty across prompts and individual decoding steps. We…

Machine Learning · Computer Science 2026-03-17 Chloe H. Su , Zhe Ye , Samuel Tenka , Aidan Yang , Soonho Kong , Udaya Ghai