基于双语依存关系映射的中英文词表构建研究

摘要

Currently context-based approach is a popular approach for constructing bilingual lexicons from comparable bilingual corpora. Specifically, the dependency context model extracts context features from a sentence's dependency tree. This model improves the performance of the bilingual lexicon construction since dependency relationships can better capture the co-occurrence relationship between words. Following this line, this paper further proposes a dependency relationship mapping model, which constructs bilingual lexicon by mapping dependency context words, dependency relationship types and directions simultaneously. The experiments on the FBIS corpus show that, our approach significantly outperforms a state-of-the-art system in bilingual lexicon construction from both Chinese-English and English-Chinese. This justifies the effectiveness of our dependency relationship mapping model on bilingual lexicon construction.%基于上下文的双语词表构建方法是比较流行的基于可比较双语语料库的双语词表构建方法.特别地,依存上下文模型从句子的依存树上抽取词语的上下文特征,由于依存关系更能体现词语之间的共现关系,因而这种方法提高了构建双语词表的性能.该文在此基础上,进一步提出了依存关系映射模型,即通过同时匹配依存树中的上下文词语、依存关系类型和方向来实现双语词表的构建.在FBIS语料库上的实验表明,该方法在中文—英文和英文—中文两个方向上的双语词表构建上均取得了较好的性能,这说明了依存关系映射模型在双语词表构建中的有效性.