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Evolved Apache Lucene SpanFirst queries are good text classifiers

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1 Author(s)
Hirsch, L. ; Dept. of Comput., Sheffield Hallam Univ., Sheffield, UK

Human readable text classifiers have a number of advantages over classifiers based on complex and opaque mathematical models. For some time now search queries or rules have been used for classification purposes, either constructed manually or automatically. We have performed experiments using genetic algorithms to evolve text classifiers in search query format with the combined objective of classifier accuracy and classifier readability. We have found that a small set of disjunct Lucene SpanFirst queries effectively meet both goals. This kind of query evaluates to true for a document if a particular word occurs within the first N words of a document. Previously researched classifiers based on queries using combinations of words connected with OR, AND and NOT were found to be generally less accurate and (arguably) less readable. The approach is evaluated using standard test sets Reuters-21578 and Ohsumed and compared against several classification algorithms.

Published in:

Evolutionary Computation (CEC), 2010 IEEE Congress on

Date of Conference:

18-23 July 2010

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