A New Statistical Parser Based on Bigram Lexical Dependencies

Details A New Statistical Parser Based on Bigram Lexical Dependencies A New Statistical Parser Based on Bigram Lexical Dependencies

1996-05-06

arxiv.org/abs/cmp-lg/9605012v1

Computer Science

Computation and Language

8 pages, to appear in Proceedings of ACL 96. Uuencoded gz-compressed postscript file created by csh script uufiles

Scientific paper

This paper describes a new statistical parser which is based on probabilities of dependencies between head-words in the parse tree. Standard bigram probability estimation techniques are extended to calculate probabilities of dependencies between pairs of words. Tests using Wall Street Journal data show that the method performs at least as well as SPATTER (Magerman 95, Jelinek et al 94), which has the best published results for a statistical parser on this task. The simplicity of the approach means the model trains on 40,000 sentences in under 15 minutes. With a beam search strategy parsing speed can be improved to over 200 sentences a minute with negligible loss in accuracy.

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