| Challenge: | Inflected words benefit more from explicitly modeling morphology than uninflectes . morphological supervision is also used to augment character language models in low-resource languages . |
| Approach: | They add morphological supervision to character language models via multitasking to improve BPC performance across 24 languages even when morphology data and language modeling data are disjointed. |
| Outcome: | The addition improves performance even when morphology data and language modeling data are disjointed. |
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What do character-level models learn about morphology? The case of dependency parsing (D18-1)
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| Challenge: | morphologically rich languages require character-level input models to learn morphology, but some models are poor at disambiguating some words . authors of this study show that character- level models learn a lot from input input . explicit modeling of morphologies is expensive and expensive, authors say . |
| Approach: | They compare character-level models to an oracle with explicit morphological analysis . they show that explicitly modeling morphology improves their best model . |
| Outcome: | The results show that character-level models learn morphology better than word models . the authors compare character-based models to oracles on 12 languages with morphological typologies . |
Morphology Matters: A Multilingual Language Modeling Analysis (2021.tacl-1)
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| Challenge: | Existing studies on inflectional morphology disagree on whether or not it makes languages harder to model. |
| Approach: | They propose to use a corpus of 145 Bible translations in 92 languages to investigate whether inflectional morphology makes languages harder to model. |
| Outcome: | The proposed model trains with linguistically motivated subword segmentation strategies and reduces the impact of morphology on language modeling. |
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. |
Morphological Inflection with Phonological Features (2023.acl-short)
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| Challenge: | Recent advances in morphological tasks can be difficult to solve when little training data is available or when generalizing to previously unseen lemmas. |
| Approach: | They propose two methods to manipulate phonemic data to include phonological features instead of characters. |
| Outcome: | The proposed methods yield comparable results to baseline models, with minor improvements in some languages. |
A Morphology-Based Investigation of Positional Encodings (2024.emnlp-main)
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| Challenge: | Contemporary deep learning models handle languages with diverse morphology . morphological complexity of languages is closely linked with positional encodings . |
| Approach: | They propose to use positional encodings to integrate morphological complexity into deep learning models. |
| Outcome: | The proposed model improves on 22 languages and 5 downstream tasks. |
Getting More Data for Low-resource Morphological Inflection: Language Models and Data Augmentation (2020.lrec-1)
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| Challenge: | Morphological inflection is the process that generates the word form given its lexeme and morphological properties. |
| Approach: | They propose to use language models and data augmentation to improve morphological inflection without annotating more data. |
| Outcome: | The proposed model improves by 1.5% with the langauge model and by 9% with the data augmentation. |
Confounding Factors in Relating Model Performance to Morphology (2025.emnlp-main)
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| Challenge: | morphological differences between languages are unclear, but are often considered unimportant . confounding factors make it hard to compare results and draw conclusions, authors argue . |
| Approach: | They propose to use token bigram metrics to predict difficulty of causal language modeling . they argue that confounding factors are contributing to the conflicting evidence . |
| Outcome: | The proposed metrics better capture the relation between morphology and tokenization compared to word-based models. |
Exploring morphology-aware tokenization: A case study on Spanish language modeling (2025.emnlp-main)
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| Challenge: | a recent study shows that subword tokenization improves performance of neural language models. |
| Approach: | They propose a linguistically grounded approach to train a tokenizer on morphologically segmented data. |
| Outcome: | The proposed tokenizer improves on a Spanish language model with morphological information. |
Why do language models perform worse for morphologically complex languages? (2025.coling-main)
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| Challenge: | Language models perform differently across languages, a new study suggests . morphological typology may explain some of the performance differences, authors say . |
| Approach: | They propose to test morphological alignment of tokenizers, tokenization quality and disparities in dataset sizes and measurement to test this hypothesis. |
| Outcome: | The proposed model shows that fusional languages perform better than fusionative languages . the authors suggest that morphological typology may explain some of the performance differences . |
Morphological Inflection: A Reality Check (2023.acl-long)
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| Challenge: | Morphological inflection is a popular task in sub-word NLP with practical and cognitive applications. |
| Approach: | They propose new methods to analyze data sets and evaluate their generalization abilities to better reflect likely use-cases. |
| Outcome: | The proposed methods improve generalizability and reliability of results and improve generalization abilities. |