A Transition-Based Directed Acyclic Graph Parser for UCCA

ACL 2017

A Transition-Based Directed Acyclic Graph Parser for UCCA

Jan 27, 2021
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Abstract: We present the first parser for UCCA, a cross-linguistically applicable framework for semantic representation, which builds on extensive typological work and supports rapid annotation. UCCA poses a challenge for existing parsing techniques, as it exhibits reentrancy (resulting in DAG structures), discontinuous structures and non-terminal nodes corresponding to complex semantic units. To our knowledge, the conjunction of these formal properties is not supported by any existing parser. Our transition-based parser, which uses a novel transition set and features based on bidirectional LSTMs, has value not just for UCCA parsing: its ability to handle more general graph structures can inform the development of parsers for other semantic DAG structures, and in languages that frequently use discontinuous structures. Authors: Daniel Hershcovich, Omri Abend, Ari Rappoport (Hebrew University of Jerusalem)

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