Ordered Tree Decomposition for HRG Rule Extraction
Ordered Tree Decomposition for HRG Rule Extraction
复制标题
HRG 规则提取的有序树分解
DOI:
10.1162/coli_a_00350
复制
发表时间:
2019
影响因子:
9.3
通讯作者:
Peng, Xiaochang
中科院分区:
文献类型:
--
作者:
Gildea, Daniel;Satta, Giorgio;Peng, Xiaochang
We present algorithms for extracting Hyperedge Replacement Grammar (HRG) rules from a graph along with a vertex order. Our algorithms are based on finding a tree decomposition of smallest width, relative to the vertex order, and then extracting one rule for each node in this structure. The assumption of a fixed order for the vertices of the input graph makes it possible to solve the problem in polynomial time, in contrast to the fact that the problem of finding optimal tree decompositions for a graph is NP-hard. We also present polynomial-time algorithms for parsing based on our HRGs, where the input is a vertex sequence and the output is a graph structure. The intended application of our algorithms is grammar extraction and parsing for semantic representation of natural language. We apply our algorithms to data annotated with Abstract Meaning Representations and report on the characteristics of the resulting grammars.
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