Effective Constituent Projection across Languages

We describe an effective constituent projection strategy, where constituent projection is performed on the basis of dependency projection. Especially, a novel measurement is proposed to evaluate the candidate projected constituents for a target language sentence, and a PCFG-style parsing procedure is then used to search for the most probable projected constituent tree. Experiments show that, the parser trained on the projected treebank can significantly boost a state-of-the-art supervised parser. When integrated into a tree-based machine translation system, the projected parser leads to translation performance comparable with using a supervised parser trained on thousands of annotated trees.

• Type: Journal
• Year: 2010
• Where: COLING
• Authors: Wenbin Jiang, Yajuan Lv, Yang Liu, Qun Liu
• Keywords: COLING 2010, Computational Linguistics, Constituent Projection, Effective Constituent Projection, Supervised Parser