Improved Neural Protoform Reconstruction via Reflex Prediction

Liang Lu, Jingzhi Wang, David R. Mortensen


Abstract
Protolanguage reconstruction is central to historical linguistics. The comparative method, one of the most influential theoretical and methodological frameworks in the history of the language sciences, allows linguists to infer protoforms (reconstructed ancestral words) from their reflexes (related modern words) based on the assumption of regular sound change. Not surprisingly, numerous computational linguists have attempted to operationalize comparative reconstruction through various computational models, the most successful of which have been supervised encoder-decoder models, which treat the problem of predicting protoforms given sets of reflexes as a sequence-to-sequence problem. We argue that this framework ignores one of the most important aspects of the comparative method: not only should protoforms be inferable from cognate sets (sets of related reflexes) but the reflexes should also be inferable from the protoforms. Leveraging another line of research—reflex prediction—we propose a system in which candidate protoforms from a reconstruction model are reranked by a reflex prediction model. We show that this more complete implementation of the comparative method allows us to surpass state-of-the-art protoform reconstruction methods on three of four Chinese and Romance datasets.
Anthology ID:
2024.lrec-main.762
Volume:
Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024)
Month:
May
Year:
2024
Address:
Torino, Italia
Editors:
Nicoletta Calzolari, Min-Yen Kan, Veronique Hoste, Alessandro Lenci, Sakriani Sakti, Nianwen Xue
Venues:
LREC | COLING
SIG:
Publisher:
ELRA and ICCL
Note:
Pages:
8683–8707
Language:
URL:
https://aclanthology.org/2024.lrec-main.762
DOI:
Bibkey:
Cite (ACL):
Liang Lu, Jingzhi Wang, and David R. Mortensen. 2024. Improved Neural Protoform Reconstruction via Reflex Prediction. In Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation (LREC-COLING 2024), pages 8683–8707, Torino, Italia. ELRA and ICCL.
Cite (Informal):
Improved Neural Protoform Reconstruction via Reflex Prediction (Lu et al., LREC-COLING 2024)
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PDF:
https://aclanthology.org/2024.lrec-main.762.pdf