CRYSTAL: Inducing a Conceptual Dictionary

Details CRYSTAL: Inducing a Conceptual Dictionary CRYSTAL: Inducing a Conceptual Dictionary

1995-05-09

arxiv.org/abs/cmp-lg/9505020v1

Computer Science

Computation and Language

6 pages, Postscript, IJCAI-95 http://ciir.cs.umass.edu/info/psfiles/tepubs/tepubs.html

Scientific paper

One of the central knowledge sources of an information extraction system is a dictionary of linguistic patterns that can be used to identify the conceptual content of a text. This paper describes CRYSTAL, a system which automatically induces a dictionary of "concept-node definitions" sufficient to identify relevant information from a training corpus. Each of these concept-node definitions is generalized as far as possible without producing errors, so that a minimum number of dictionary entries cover the positive training instances. Because it tests the accuracy of each proposed definition, CRYSTAL can often surpass human intuitions in creating reliable extraction rules.

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