A general dimension for query learning

  • Authors:
  • José L. Balcázar;Jorge Castro;David Guijarro;Johannes Köbler;Wolfgang Lindner

  • Affiliations:
  • Departament de LSI, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain;Departament de LSI, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain;Mannes Technology Consulting, Pl. Tirant lo Blanc 7, 08005 Barcelona, Spain;Institut für Informatik, Humboldt-Universität zu Berlin, 10099 Berlin, Germany;Fakultät für Informatik, Universität Ulm, D-89069 Ulm, Germany

  • Venue:
  • Journal of Computer and System Sciences
  • Year:
  • 2007

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Abstract

We introduce a combinatorial dimension that characterizes the number of queries needed to exactly (or approximately) learn concept classes in various models. Our general dimension provides tight upper and lower bounds on the query complexity for all sorts of queries, not only for example-based queries as in previous works. As an application we show that for learning DNF formulas, unspecified attribute value membership and equivalence queries are not more powerful than standard membership and equivalence queries. Further, in the approximate learning setting, we use the general dimension to characterize the query complexity in the statistical query as well as the learning by distances model. Moreover, we derive close bounds on the number of statistical queries needed to approximately learn DNF formulas.