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Lemmatization is a natural language processing (NLP) task which consists of producing, from a given inflected word, its canonical form or lemma. Lemmatization is one of the basic tasks that facilitate downstream NLP applications, and is of…

Computation and Language · Computer Science 2023-10-23 Olia Toporkov , Rodrigo Agerri

English verbs have multiple forms. For instance, talk may also appear as talks, talked or talking, depending on the context. The NLP task of lemmatization seeks to map these diverse forms back to a canonical one, known as the lemma. We…

Computation and Language · Computer Science 2024-05-29 Chaitanya Malaviya , Shijie Wu , Ryan Cotterell

Lemmatization is the task of transforming all words in a given text to their dictionary forms. While large language models (LLMs) have demonstrated their ability to achieve competitive results across a wide range of NLP tasks, there is no…

Computation and Language · Computer Science 2025-10-10 Olia Toporkov , Alan Akbik , Rodrigo Agerri

The absence of standardized spelling conventions and the organic evolution of human language present an inherent linguistic challenge within historical documents, a longstanding concern for scholars in the humanities. Addressing this issue,…

Computation and Language · Computer Science 2025-07-01 Miguel Domingo , Francisco Casacuberta

We critically evaluate the widespread assumption that deep learning NLP models do not require lemmatized input. To test this, we trained versions of contextualised word embedding ELMo models on raw tokenized corpora and on the corpora with…

Computation and Language · Computer Science 2019-09-10 Andrey Kutuzov , Elizaveta Kuzmenko

Lemmatization aims to reduce the sparse data problem by relating the inflected forms of a word to its dictionary form. Using context can help, both for unseen and ambiguous words. Yet most context-sensitive approaches require full…

Computation and Language · Computer Science 2019-07-02 Toms Bergmanis , Sharon Goldwater

We propose a novel hybrid approach to lemmatization that enhances the seq2seq neural model with additional lemmas extracted from an external lexicon or a rule-based system. During training, the enhanced lemmatizer learns both to generate…

Computation and Language · Computer Science 2022-11-16 Kirill Milintsevich , Kairit Sirts

Modern contextual lemmatizers often rely on automatically induced Shortest Edit Scripts (SES), namely, the number of edit operations to transform a word form into its lemma. In fact, different methods of computing SES have been proposed as…

Computation and Language · Computer Science 2024-03-26 Olia Toporkov , Rodrigo Agerri

We live in a translingual society, in order to communicate with people from different parts of the world we need to have an expertise in their respective languages. Learning all these languages is not at all possible; therefore we need a…

Computation and Language · Computer Science 2013-07-16 Snigdha Paul , Nisheeth Joshi , Iti Mathur

Semitic languages can be highly ambiguous, having several interpretations of the same surface forms, and morphologically rich, having many morphemes that realize several morphological features. This is further exacerbated for dialectal…

Computation and Language · Computer Science 2019-10-08 Nasser Zalmout , Nizar Habash

Lexical normalisation (LN) is the process of correcting each word in a dataset to its canonical form so that it may be more easily and more accurately analysed. Most lexical normalisation systems operate at the character-level, while…

Computation and Language · Computer Science 2019-11-15 Michael Stewart , Wei Liu , Rachel Cardell-Oliver

This paper presents a joint model for performing unsupervised morphological analysis on words, and learning a character-level composition function from morphemes to word embeddings. Our model splits individual words into segments, and…

Computation and Language · Computer Science 2016-06-09 Kris Cao , Marek Rei

Lemmatization is the process of grouping together the inflected forms of a word so they can be analysed as a single item, identified by the word's lemma, or dictionary form. In computational linguistics, lemmatisation is the algorithmic…

Computation and Language · Computer Science 2022-07-26 Michal Karwatowski , Marcin Pietron

Current benchmark tasks for natural language processing contain text that is qualitatively different from the text used in informal day to day digital communication. This discrepancy has led to severe performance degradation of…

Computation and Language · Computer Science 2021-10-13 Ana-Maria Bucur , Adrian Cosma , Liviu P. Dinu

One of the challenges with finetuning pretrained language models (PLMs) is that their tokenizer is optimized for the language(s) it was pretrained on, but brittle when it comes to previously unseen variations in the data. This can for…

Computation and Language · Computer Science 2023-04-21 Verena Blaschke , Hinrich Schütze , Barbara Plank

Lemmatization holds significance in both natural language processing (NLP) and linguistics, as it effectively decreases data density and aids in comprehending contextual meaning. However, due to the highly inflected nature and morphological…

For both human readers and pre-trained language models (PrLMs), lexical diversity may lead to confusion and inaccuracy when understanding the underlying semantic meanings of given sentences. By substituting complex words with simple…

Computation and Language · Computer Science 2021-01-01 Rongzhou Bao , Jiayi Wang , Zhuosheng Zhang , Hai Zhao

Sequence labelling is the task of assigning categorical labels to a data sequence. In Natural Language Processing, sequence labelling can be applied to various fundamental problems, such as Part of Speech (POS) tagging, Named Entity…

Computation and Language · Computer Science 2018-07-31 Mahtab Ahmed , Muhammad Rifayat Samee , Robert E. Mercer

Neural language modeling (LM) has led to significant improvements in several applications, including Automatic Speech Recognition. However, they typically require large amounts of training data, which is not available for many domains and…

Computation and Language · Computer Science 2019-06-05 Navid Rekabsaz , Nikolaos Pappas , James Henderson , Banriskhem K. Khonglah , Srikanth Madikeri

Neural machine translation (NMT) is notoriously sensitive to noises, but noises are almost inevitable in practice. One special kind of noise is the homophone noise, where words are replaced by other words with similar pronunciations. We…

Computation and Language · Computer Science 2019-06-05 Hairong Liu , Mingbo Ma , Liang Huang , Hao Xiong , Zhongjun He
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