Transforming Projective Bilexical Dependency Grammars into efficiently-parsable CFGs with Unfold-Fold
Transforming Projective Bilexical Dependency Grammars into efficiently-parsable CFGs with Unfold-Fold
复制标题
使用 Unfold-Fold 将投射双词依存语法转换为可有效解析的 CFG
DOI:
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
Mark Johnson
中科院分区:
文献类型:
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作者:
Mark Johnson
This paper shows how to use the UnfoldFold transformation to transform Projective Bilexical Dependency Grammars (PBDGs) into ambiguity-preserving weakly equivalent Context-Free Grammars (CFGs). These CFGs can be parsed in O(n 3 ) time using a CKY algorithm with appropriate indexing, rather than the O(n 5 ) time required by a naive encoding. Informally, using the CKY algorithm with such a CFG mimics the steps of the Eisner-Satta O(n 3 ) PBDG parsing algorithm. This transformation makes all of the techniques developed for CFGs available to PBDGs. We demonstrate this by describing a maximum posterior parse decoder for PBDGs.
DOI:
10.3115/1219840.1219850
发表时间:
2005-06
期刊:
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影响因子:
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作者:
Takuya Matsuzaki;Yusuke Miyao;Junichi Tsujii
通讯作者:
Takuya Matsuzaki;Yusuke Miyao;Junichi Tsujii