MTLB-STRUCT @Parseme 2020: Capturing Unseen Multiword Expressions Using Multi-task Learning and Pre-trained Masked Language Models

Shiva Taslimipoor, Sara Bahaadini, Ekaterina Kochmar


Abstract
This paper describes a semi-supervised system that jointly learns verbal multiword expressions (VMWEs) and dependency parse trees as an auxiliary task. The model benefits from pre-trained multilingual BERT. BERT hidden layers are shared among the two tasks and we introduce an additional linear layer to retrieve VMWE tags. The dependency parse tree prediction is modelled by a linear layer and a bilinear one plus a tree CRF architecture on top of the shared BERT. The system has participated in the open track of the PARSEME shared task 2020 and ranked first in terms of F1-score in identifying unseen VMWEs as well as VMWEs in general, averaged across all 14 languages.
Anthology ID:
2020.mwe-1.19
Volume:
Proceedings of the Joint Workshop on Multiword Expressions and Electronic Lexicons
Month:
December
Year:
2020
Address:
online
Venues:
COLING | MWE
SIG:
SIGLEX
Publisher:
Association for Computational Linguistics
Note:
Pages:
142–148
Language:
URL:
https://www.aclweb.org/anthology/2020.mwe-1.19
DOI:
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PDF:
http://aclanthology.lst.uni-saarland.de/2020.mwe-1.19.pdf