Syntax and Semantics Meet in the “Middle”: Probing the Syntax-Semantics Interface of LMs Through Agentivity

Lindia Tjuatja, Emmy Liu, Lori Levin, Graham Neubig


Abstract
Recent advances in large language models have prompted researchers to examine their abilities across a variety of linguistic tasks, but little has been done to investigate how models handle the interactions in meaning across words and larger syntactic forms—i.e. phenomena at the intersection of syntax and semantics. We present the semantic notion of agentivity as a case study for probing such interactions. We created a novel evaluation dataset by utilitizing the unique linguistic properties of a subset of optionally transitive English verbs. This dataset was used to prompt varying sizes of three model classes to see if they are sensitive to agentivity at the lexical level, and if they can appropriately employ these word-level priors given a specific syntactic context. Overall, GPT-3 text-davinci-003 performs extremely well across all experiments, outperforming all other models tested by far. In fact, the results are even better correlated with human judgements than both syntactic and semantic corpus statistics. This suggests that LMs may potentially serve as more useful tools for linguistic annotation, theory testing, and discovery than select corpora for certain tasks.
Anthology ID:
2023.starsem-1.14
Volume:
Proceedings of the 12th Joint Conference on Lexical and Computational Semantics (*SEM 2023)
Month:
July
Year:
2023
Address:
Toronto, Canada
Editors:
Alexis Palmer, Jose Camacho-collados
Venue:
*SEM
SIG:
SIGLEX
Publisher:
Association for Computational Linguistics
Note:
Pages:
149–164
Language:
URL:
https://aclanthology.org/2023.starsem-1.14
DOI:
10.18653/v1/2023.starsem-1.14
Bibkey:
Cite (ACL):
Lindia Tjuatja, Emmy Liu, Lori Levin, and Graham Neubig. 2023. Syntax and Semantics Meet in the “Middle”: Probing the Syntax-Semantics Interface of LMs Through Agentivity. In Proceedings of the 12th Joint Conference on Lexical and Computational Semantics (*SEM 2023), pages 149–164, Toronto, Canada. Association for Computational Linguistics.
Cite (Informal):
Syntax and Semantics Meet in the “Middle”: Probing the Syntax-Semantics Interface of LMs Through Agentivity (Tjuatja et al., *SEM 2023)
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PDF:
https://aclanthology.org/2023.starsem-1.14.pdf