Holographic CCG Parsing

Ryosuke Yamaki, Tadahiro Taniguchi, Daichi Mochihashi


Abstract
We propose a method for formulating CCG as a recursive composition in a continuous vector space. Recent CCG supertagging and parsing models generally demonstrate high performance, yet rely on black-box neural architectures to implicitly model phrase structure dependencies. Instead, we leverage the method of holographic embeddings as a compositional operator to explicitly model the dependencies between words and phrase structures in the embedding space. Experimental results revealed that holographic composition effectively improves the supertagging accuracy to achieve state-of-the-art parsing performance when using a C&C parser. The proposed span-based parsing algorithm using holographic composition achieves performance comparable to state-of-the-art neural parsing with Transformers. Furthermore, our model can semantically and syntactically infill text at the phrase level due to the decomposability of holographic composition.
Anthology ID:
2023.acl-long.15
Volume:
Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)
Month:
July
Year:
2023
Address:
Toronto, Canada
Editors:
Anna Rogers, Jordan Boyd-Graber, Naoaki Okazaki
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
262–276
Language:
URL:
https://aclanthology.org/2023.acl-long.15
DOI:
10.18653/v1/2023.acl-long.15
Bibkey:
Cite (ACL):
Ryosuke Yamaki, Tadahiro Taniguchi, and Daichi Mochihashi. 2023. Holographic CCG Parsing. In Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), pages 262–276, Toronto, Canada. Association for Computational Linguistics.
Cite (Informal):
Holographic CCG Parsing (Yamaki et al., ACL 2023)
Copy Citation:
PDF:
https://aclanthology.org/2023.acl-long.15.pdf
Video:
 https://aclanthology.org/2023.acl-long.15.mp4