{"type":"ScholarlyArticle","title":"CRYSTAL: Inducing a Conceptual Dictionary","authors":[{"name":"Stephen Soderland","slug":"stephen-soderland","given":"Stephen","family":"Soderland","affiliation":""},{"name":"David Fisher","slug":"david-fisher","given":"David","family":"Fisher","affiliation":""},{"name":"Jonathan Aseltine","slug":"jonathan-aseltine","given":"Jonathan","family":"Aseltine","affiliation":""},{"name":"Wendy G. Lehnert","slug":"wendy-g-lehnert","given":"Wendy G.","family":"Lehnert","affiliation":""}],"abstract":"One of the central knowledge sources of an information extraction (IE) system is a dictionary of linguistic patterns that can be used to identify references to relevant information in a text. Automatic creation of conceptual dictionaries is important for portability and scalability of an IE system. 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.","doi":null,"url":"https://ijcai.org/proceedings/1995/169","pdf":"https://ijcai.org/proceedings/1995/0169.pdf","markdown":"https://ijcai.org/proceedings/1995/169.md","bibtex":"https://ijcai.org/proceedings/1995/bibtex/169","volume":{"slug":"1995","title":"Proceedings of the Fourteenth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 1995","url":"https://ijcai.org/proceedings/1995/","year":1995,"location":"Montréal, Québec, Canada","dates":"","editors":"Chris S. Mellish","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":"Natural Language","track":"Natural Language","number":169,"pages":{"first":1314,"last":1320},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}