Slaapte or Sliep? Extending Neural-Network Simulations of English Past Tense Learning to Dutch and German
What it is about
The paper repeats Kirov and Cotterell's (2018) study of past-tense learning with a BiLSTM encoder-decoder, on English, Dutch and German. The authors build a new dataset of about 6,100 verb forms per language from UniMorph, split by lemma into 80/10/10 so that no lemma appears in two splits. The model reproduces over-regularisation and the micro U-shape of single verbs. On the English irregulars, its test accuracy is 35.3%, against 28.6% in the original paper; the authors say that this gap comes from about 20 irregular verbs. When the model is trained on spelling instead of phonemes, English irregular test accuracy falls from 40.5% to 28.1%, while Dutch and German change little, because their spelling is more transparent.
Ideas
- I1.
en/src/morph.rs: a memory-based English past-tense model, which copies the past tense of the most similar known verb (by suffix and vowel) for unseen irregulars. Measure irregular-verb accuracy on a lemma-held-out split, with a negative control where the neighbour is chosen at random. - I2. Spelling versus sound: the paper shows that a spelling-based learner loses about 12 points on English irregulars. Keep Mova's English rules on spelling and mark the irregular cases that need the phonology in 06. Spelling rules: inflection, derivation, compounds and national standards.
- I3. Lemma-grouped folds: check that Mova's cross-validation groups all forms of a lemma in one fold, as the paper does, and report any leak as a bug.
- I4. The "resembles a regular verb" errors (for example "reitet" and "bereitet" in German) suggest a list of English irregulars with a regular neighbour (for example "sink" and "sank"); put it in 14. Irregular verbs as a test set.
For Mova
The English chapters are 13. Verbs and 14-irregular-verbs.md, with the morphology code in en/src/morph.rs. The paper's findings for English are the irregular-verb accuracy and the spelling effect, both measured on lemma-held-out splits. Dutch and German results are for comparison only. The dataset is built from UniMorph; check its licence before using it in a release.
Cite
@inproceedings{yang2023slaapte,
title = {{Slaapte or Sliep? Extending Neural-Network Simulations of English Past Tense Learning to Dutch and German}},
author = {Yang, Xiulin and Chen, Jingyan and Eerden, Arjan van and Samin, Ahnaf and Bisazza, Arianna},
booktitle = {Proceedings of the 24th Nordic Conference on Computational Linguistics (NoDaLiDa)},
year = {2023},
url = {https://aclanthology.org/2023.nodalida-1.11/}
}References
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