Insertion Operator for Bayesian Tree Substitution Grammars

Hiroyuki Shindo,  Akinori Fujino,  Masaaki Nagata
NTT Communication Science Laboratories, NTT Corp.


Abstract

We propose a model that incorporates an insertion operator in Bayesian tree substitution grammars (BTSG). Tree insertion is helpful for modeling syntax patterns accurately with fewer grammar rules than BTSG. The experimental parsing results show that our model outperforms a standard PCFG and BTSG for a small dataset. For a large dataset, our model obtains comparable results to BTSG, making the number of grammar rules much smaller than with BTSG.




Full paper: http://www.aclweb.org/anthology/P/P11/P11-2036.pdf