Transforming Projective Bilexical Dependency Grammars into efficiently-parsable CFGs with Unfold-Fold

Transforming Projective Bilexical Dependency Grammars into efficiently-parsable CFGs with Unfold-Fold
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使用 Unfold-Fold 将投射双词依存语法转换为可有效解析的 CFG

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发表时间:
2007
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影响因子:
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通讯作者:
Mark Johnson
Mark Johnson
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作者:
Mark Johnson

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本文介绍了如何利用UnfoldFold变换将投影双相依赖语法(pbdg)转化为保持歧义的弱等价上下文无关语法(CFGs)。使用带有适当索引的CKY算法可以在O(n 3)时间内解析这些cfg,而不是简单编码所需的O(n 5)时间。非正式地,使用CKY算法与这样的CFG模拟Eisner-Satta O(n 3) PBDG解析算法的步骤。这种转变使得为cfg开发的所有技术都可以用于pbdg。我们通过描述pbdg的最大后验解析解码器来证明这一点。
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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作者:
Takuya Matsuzaki;Yusuke Miyao;Junichi Tsujii
通讯作者: Takuya Matsuzaki;Yusuke Miyao;Junichi Tsujii