Probabilistic combination of text classifiers using reliability indicators: models and results

  • Authors:
  • Paul N. Bennett;Susan T. Dumais;Eric Horvitz

  • Affiliations:
  • Carnegie Mellon University, Pittsburgh, PA;Microsoft Research, Redmond, WA;Microsoft Research, Redmond, WA

  • Venue:
  • SIGIR '02 Proceedings of the 25th annual international ACM SIGIR conference on Research and development in information retrieval
  • Year:
  • 2002

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Abstract

The intuition that different text classifiers behave in qualitatively different ways has long motivated attempts to build a better metaclassifier via some combination of classifiers. We introduce a probabilistic method for combining classifiers that considers the context-sensitive reliabilities of contributing classifiers. The method harnesses reliability indicators---variables that provide a valuable signal about the performance of classifiers in different situations. We provide background, present procedures for building metaclassifiers that take into consideration both reliability indicators and classifier outputs, and review a set of comparative studies undertaken to evaluate the methodology.