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The first step in any NLP pipeline is to split the text into individual tokens. The most obvious and straightforward approach is to use words as tokens. However, given a large text corpus, representing all the words is not efficient in…

Computation and Language · Computer Science 2021-09-30 Zaid Alyafeai , Maged S. Al-shaibani , Mustafa Ghaleb , Irfan Ahmad

Subword tokenization methods, such as Byte-Pair Encoding (BPE), significantly impact the performance and efficiency of large language models (LLMs). The standard approach involves training a general-purpose tokenizer that uniformly…

Computation and Language · Computer Science 2026-01-30 Vijini Liyanage , François Yvon

Subword tokenization has become the de-facto standard for tokenization, although comparative evaluations of subword vocabulary quality across languages are scarce. Existing evaluation studies focus on the effect of a tokenization algorithm…

Computation and Language · Computer Science 2023-10-23 Lisa Beinborn , Yuval Pinter

Variation in language is ubiquitous and often systematically linked to regional, social, and contextual factors. Tokenizers split texts into smaller units and might behave differently for less common linguistic forms. This might affect…

Computation and Language · Computer Science 2025-07-08 Anna Wegmann , Dong Nguyen , David Jurgens

Large language models (LLMs) have revolutionized natural language processing, yet they remain constrained by fixed, non-differentiable tokenizers like Byte Pair Encoding (BPE), which hinder end-to-end optimization and adaptability to noisy…

Computation and Language · Computer Science 2026-01-30 Alon Rozental

Language models typically tokenize text into subwords, using a deterministic, hand-engineered heuristic of combining characters into longer surface-level strings such as 'ing' or whole words. Recent literature has repeatedly shown the…

Computation and Language · Computer Science 2023-10-19 Avijit Thawani , Saurabh Ghanekar , Xiaoyuan Zhu , Jay Pujara

Extending pre-trained text Large Language Models (LLMs)'s speech understanding or generation abilities by introducing various effective speech tokens has attracted great attention in the speech community. However, building a unified speech…

Sound · Computer Science 2025-11-18 Yuanyuan Wang , Dongchao Yang , Yiwen Shao , Hangting Chen , Jiankun Zhao , Zhiyong Wu , Helen Meng , Xixin Wu

Tokenization is a crucial step in NLP, especially with the rise of large language models (LLMs), impacting downstream performance, computational cost, and efficiency. Existing LLMs rely on the classical Byte-pair Encoding (BPE) algorithm…

Computation and Language · Computer Science 2025-11-10 Maharaj Brahma , N J Karthika , Atul Singh , Devaraj Adiga , Smruti Bhate , Ganesh Ramakrishnan , Rohit Saluja , Maunendra Sankar Desarkar

Large language models (LLMs) have achieved remarkable success across various natural language processing tasks. However, most LLM models use traditional tokenizers like BPE and SentencePiece, which fail to capture the finer nuances of a…

Computation and Language · Computer Science 2025-05-26 Pramit Bhattacharyya , Arnab Bhattacharya

Fine tuning has been regarded as a de facto approach for adapting large language models (LLMs) to downstream tasks, but the high training memory consumption inherited from LLMs makes this process inefficient. Among existing memory efficient…

Computation and Language · Computer Science 2026-01-28 Runjia Zeng , Qifan Wang , Qiang Guan , Ruixiang Tang , Lifu Huang , Zhenting Wang , Xueling Zhang , Cheng Han , Dongfang Liu

When using an LLM to process text outside the training domain(s), an often overlooked factor is vocabulary mismatch, where the general-domain tokenizer fails to capture frequent domain-specific terms, leading to higher token fertility and…

Computation and Language · Computer Science 2025-10-01 Christian Herold , Michael Kozielski , Nicholas Santavas , Yannick Versley , Shahram Khadivi

Tokenization is a critical part of modern NLP pipelines. However, contemporary tokenizers for Large Language Models are based on statistical analysis of text corpora, without much consideration to the linguistic features. I propose a…

Computation and Language · Computer Science 2024-02-06 Haris Jabbar

The rapid advancement of large language models (LLMs) has led to significant improvements in natural language processing but also poses challenges due to their high computational and energy demands. This paper introduces a series of…

Computation and Language · Computer Science 2024-06-27 Dylan Hillier , Leon Guertler , Cheston Tan , Palaash Agrawal , Chen Ruirui , Bobby Cheng

Recent advances in generative AI have been largely driven by large language models (LLMs), deep neural networks that operate over discrete units called tokens. To represent text, the vast majority of LLMs use words or word fragments as the…

Bangla, a language spoken by over 300 million native speakers and ranked as the sixth most spoken language worldwide, presents unique challenges in natural language processing (NLP) due to its complex morphological characteristics and…

Computation and Language · Computer Science 2025-03-06 Souvika Sarkar , Md. Najib Hasan , Santu Karmaker

Tokenization is a fundamental component of large language models (LLMs), yet its influence on model scaling and performance is not fully explored. In this paper, we introduce Over-Tokenized Transformers, a novel framework that decouples…

Computation and Language · Computer Science 2025-05-26 Hongzhi Huang , Defa Zhu , Banggu Wu , Yutao Zeng , Ya Wang , Qiyang Min , Xun Zhou

Tokenizers provide the fundamental basis through which text is represented and processed by language models (LMs). Despite the importance of tokenization, its role in LM performance and behavior is poorly understood due to the challenge of…

Computation and Language · Computer Science 2025-12-25 Gül Sena Altıntaş , Malikeh Ehghaghi , Brian Lester , Fengyuan Liu , Wanru Zhao , Marco Ciccone , Colin Raffel

Since traditional tokenizers are isolated from a downstream task and model, they cannot output an appropriate tokenization depending on the task and model, although recent studies imply that the appropriate tokenization improves the…

Computation and Language · Computer Science 2021-05-27 Tatsuya Hiraoka , Sho Takase , Kei Uchiumi , Atsushi Keyaki , Naoaki Okazaki

Pretraining massively multilingual Large Language Models (LLMs) for many languages at once is challenging due to limited model capacity, scarce high-quality data, and compute constraints. Moreover, the lack of language coverage of the…

The prevalent use of Byte Pair Encoding (BPE) in Large Language Models (LLMs) facilitates robust handling of subword units and avoids issues of out-of-vocabulary words. Despite its success, a critical challenge persists: long tokens, rich…

Computation and Language · Computer Science 2024-11-11 Haoran Lian , Yizhe Xiong , Zijia Lin , Jianwei Niu , Shasha Mo , Hui Chen , Peng Liu , Guiguang Ding