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Extracting preordering rules from predicate-argument structures (2011)
| Citations: | 9 - 2 self |
BibTeX
@MISC{Wu11extractingpreordering,
author = {Xianchao Wu and Katsuhito Sudoh and Kevin Duh and Hajime Tsukada and Masaaki Nagata},
title = {Extracting preordering rules from predicate-argument structures},
year = {2011}
}
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Abstract
Word ordering remains as an essential problem for translating between languages with substantial structural differences, such as SOV and SVO languages. In this paper, we propose to automatically extract pre-ordering rules from predicateargument structures. A pre-ordering rule records the relative position mapping of a predicate word and its argument phrases from the source language side to the target language side. We propose 1) a lineartime algorithm to extract the pre-ordering rules from word-aligned HPSG-tree-tostring pairs and 2) a bottom-up algorithm to apply the extracted rules to HPSG trees to yield target language style source sentences. Experimental results are reported for large-scale English-to-Japanese translation, showing significant improvements of BLEU score compared with the baseline SMT systems. 1
Keyphrases
predicate-argument structure pre-ordering rule essential problem target language side baseline smt system hpsg tree svo language bottom-up algorithm bleu score significant improvement substantial structural difference pre-ordering rule record source language side word ordering word-aligned hpsg-tree-tostring pair extracted rule argument phrase lineartime algorithm relative position mapping predicate word large-scale english-to-japanese translation target language style source sentence experimental result predicateargument structure
