Paper: Relaxed Cross-lingual Projection of Constituent Syntax

ACL ID D11-1110
Title Relaxed Cross-lingual Projection of Constituent Syntax
Venue Conference on Empirical Methods in Natural Language Processing
Session Main Conference
Year 2011

We propose a relaxed correspondence as- sumption for cross-lingual projection of con- stituent syntax, which allows a supposed constituent of the target sentence to corre- spond to an unrestricted treelet in the source parse. Such a relaxed assumption fundamen- tally tolerates the syntactic non-isomorphism between languages, and enables us to learn the target-language-specific syntactic idiosyn- crasy rather than a strained grammar di- rectly projected from the source language syn- tax. Based on this assumption, a novel con- stituency projection method is also proposed in order to induce a projected constituent tree- bank from the source-parsed bilingual cor- pus. Experiments show that, the parser trained on the projected treebank dramatically out- performs previous projected and unsupervi...