| Challenge: | Contextual word-representations use subword tokenization to handle large vocabularies and unknown words. |
| Approach: | They propose to use the first subword for morphological probing, POS tagging and NER to pool multiple subwords that correspond to a single word in contextual language models. |
| Outcome: | The proposed model outperforms two multilingual models on morphological probing, POS tagging and NER tasks in 9 languages. |
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Bits and Pieces: Investigating the Effects of Subwords in Multi-task Parsing across Languages and Domains (2024.lrec-main)
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| Challenge: | Neural parsing is dependent on the underlying language model, but little is known about how choices affect parser performance. |
| Approach: | They examine how subword sharing is responsible for gains or negative transfer in multi-task learning . they find a preference for averaged or last subwords across languages and domains . |
| Outcome: | The proposed model favors averaged or last subwords across languages and domains . specific POS tags may require different subword, and distribution overlap is more important than discrepancies in the data sizes. |
Learn Your Tokens: Word-Pooled Tokenization for Language Modeling (2023.findings-emnlp)
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| Challenge: | 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. |
| Approach: | They propose a 'learn your tokens' scheme which pooles bytes/characters into word representations and decodes individual characters/bytes per word in parallel. |
| Outcome: | The proposed tokenizer outperforms subword models and byte/character models over the word boundary and outperformed on rare words by a factor of 30! |
Unlike “Likely”, “Unlike” is Unlikely: BPE-based Segmentation hurts Morphological Derivations in LLMs (2025.coling-main)
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| Challenge: | Large Language Models (LLMs) use subword vocabularies to process and generate text. |
| Approach: | They find that Large Language Models (LLMs) perform poorly at handling some types of affixations because subwords are marked as initial- or intra-word . |
| Outcome: | The largest models trained on enough data can mitigate this tendency because initial- and intra-word embeddings are aligned; in-context learning also helps when all examples are selected in a consistent way; but only morphological segmentation can achieve a near-perfect accuracy. |
A Systematic Study of Leveraging Subword Information for Learning Word Representations (N19-1)
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| Challenge: | Existing word representation models for morphologically rich languages use subword-level information, but their systematic comparative analysis across typologically diverse languages and tasks is still missing. |
| Approach: | They propose a framework for learning subword-informed word representations that allows for easy experimentation with different segmentation and composition components. |
| Outcome: | The proposed framework allows for easy experimentation with different segmentation and composition components, as well as advanced techniques based on position embeddings and self-attention. |
Tokenization Falling Short: On Subword Robustness in Large Language Models (2024.findings-emnlp)
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| Challenge: | Language models typically tokenize raw text into sequences of subword identifiers from a predefined vocabulary. |
| Approach: | They propose to tokenize raw text into sequences of subword identifiers from a predefined vocabulary . they also investigate the challenges and their impact on large language models . |
| Outcome: | The proposed model can mitigate tokenization issues, but still suffer from typos and other variations. |
The Effectiveness of Morphology-aware Segmentation in Low-Resource Neural Machine Translation (2021.eacl-srw)
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| Challenge: | Current NMT systems typically operate at the level of subwords, causing problems of vocabulary sparsity. |
| Approach: | They compare subword segmentation methods with morphologically-based methods in a low-resource setting . they find that no consistent and reliable differences emerge between the methods . |
| Outcome: | The proposed methods outperform BPE in a low-resource translation setting. |
Revisiting subword tokenization: A case study on affixal negation in large language models (2024.naacl-long)
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| Challenge: | Negation is central to language understanding but is not properly captured by modern NLP methods. |
| Approach: | They propose to use subword tokenization methods to detect negation in large language models . they find that models can reliably recognize negation, despite mismatches in tokenization accuracy . |
| Outcome: | The proposed models can detect negation in English using subword tokenization methods despite some mismatches in tokenization accuracy and negation detection performance. |
Why and when should you pool? Analyzing Pooling in Recurrent Architectures (2020.findings-emnlp)
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| Challenge: | Various pooling techniques have been shown to improve performance of RNNs on text classification tasks. |
| Approach: | They propose a pooling-based variant that captures interactions among predictive tokens in a sentence. |
| Outcome: | The proposed pooling architecture outperforms non-pooling models on sequence classification tasks. |
Baseline Needs More Love: On Simple Word-Embedding-Based Models and Associated Pooling Mechanisms (P18-1)
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Dinghan Shen, Guoyin Wang, Wenlin Wang, Martin Renqiang Min, Qinliang Su, Yizhe Zhang, Chunyuan Li, Ricardo Henao, Lawrence Carin
| Challenge: | Existing deep learning architectures to model compositionality in text sequences require a large number of parameters and expensive computations. |
| Approach: | They propose two additional pooling strategies over word embeddings for improved interpretability and hierarchical pooling for spatial (n-gram) information within text sequences. |
| Outcome: | The proposed pooling strategies improve interpretability and preserve spatial (n-gram) information within text sequences. |
How Important Is Tokenization in French Medical Masked Language Models? (2024.lrec-main)
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| Challenge: | Word tokenization into subword units has become the prevailing standard in the field of natural language processing (NLP) over recent years . the precise factors contributing to its success remain unclear . |
| Approach: | They propose a tokenization strategy that integrates morpheme-enriched word segmentation into existing tokenization methods. |
| Outcome: | The proposed tokenization strategy outperforms character and word tokenization but the precise factors contributing to its success remain unclear. |