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
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影响因子:
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通讯作者:
Matt Post;D. Gildea
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文献类型:
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作者:
Matt Post;D. Gildea
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.