Bayesian Learning of a Tree Substitution Grammar

Bayesian Learning of a Tree Substitution Grammar
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DOI:
10.3115/1667583.1667599
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发表时间:
2009-08
期刊:
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影响因子:
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通讯作者:
Matt Post;D. Gildea
Matt Post;D. Gildea
中科院分区:
其他
文献类型:
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作者:
Matt Post;D. Gildea

文献摘要

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树替换文法(TSG)提供了许多优于上下文无关文法(CFG)的优点,但很难学习。过去的方法都是采用化学方法。在本文中,我们学习一个TSG使用吉布斯抽样与非参数之前控制子树的大小。学习的语法表现显着优于抽象提取的分析准确性。
Tree substitution grammars (TSGs) offer many advantages over context-free grammars (CFGs), but are hard to learn. Past approaches have resorted to heuristics. In this paper, we learn a TSG using Gibbs sampling with a nonparametric prior to control subtree size. The learned grammars perform significantly better than heuristically extracted ones on parsing accuracy.