树库是自然语言处理中一项重要的基础资源,现有树库基本上都是单视图树,支持短语结构语法或者依存语法。该文提出一套基于依存语法的多视图汉语树库标注体系,仅需标注中心语和语法角色两类信息,之后可以自动地推导出描述句法结构所需的短语结构功能和层次信息,从而可以在不增加标注工作量的前提下获得更多语法信息。基于该体系,构建了北京大学多视图汉语树库(PMT)1.0版,含有64 000句、140万词,支持短语结构语法和依存语法两个视图。
Treebank is an important resource for natural language processing. All the existing dependency treebanks and phrase structure treebanks might be taken as single-view treebanks. This paper proposed a schema t'or building a multi-view Chinese treebank based on dependency grammar. In this schema, we only need to annotate the head in- formation and syntactic role of a child node, and then could infer the phrase structure function and hierarchy infor- mation of the phrase, which can greatly improve the efficiency of the labeling process without losing information. According to this schema, we built the treebank PKU Multi-view Chinese Treebank (PMT) version 1.0, which contains 64 000 sentences and 1.4 million words, and supports the phrase structure grammar view and dependency grammar view.