Discontinuous Combinatory Constituency Parsing

doi:10.1162/tacl_a_00546

2023-03-22

Zhousi Chen *

Mamoru Komachi

DOI：10.1162/tacl_a_00546

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We extend a pair of continuous combinator-based constituency parsers (one binary and one multi-branching) into a discontinuous pair. Our parsers iteratively compose constituent vectors from word embeddings without any grammar constraints. Their empirical complexities are subquadratic. Our extension includes 1) a swap action for the orientation-based binary model and 2) biaffine attention for the chunker-based multi-branching model. In tests conducted with the Discontinuous Penn Treebank and TIGER Treebank, we achieved state-of-the-art discontinuous accuracy with a significant speed advantage.

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Transactions of the Association for Computational Linguistics

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6.9

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486

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5.7K

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