Hyperrelations in version space

  • Authors:
  • Hui Wang;Ivo Düntsch;Günther Gediga;Andrzej Skowron

  • Affiliations:
  • University of Ulster, Newtownabbey, BT 37 0QB, N.Ireland;University of Ulster, Newtownabbey, BT 37 0QB, N.Ireland;Institut für Evaluation und Marktanalysen, Brinkstr. 19, 49143 Jeggen, Germany;University of Warzaw, 02-097 Warszawa, Poland

  • Venue:
  • Proceedings of the 2002 ACM symposium on Applied computing
  • Year:
  • 2002

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Abstract

A version space is a set of all hypotheses consistent with a given set of training examples, delimited by the specific boundary and the general boundary. In existing studies [4, 5, 3] a hypothesis is a conjunction of attribute-value pairs, which is shown to have limited expressive power [6].In this paper we investigate version space in a more expressive hypothesis space, where a hypothesis is a hyperrelation, which is in effect a disjunction of conjunctions of disjunctions of attribute-value pairs. We propose to use an inductive bias, E-set, which turns our attention to equilabelled, supported, and maximal hypertuples. We characterise version space in such a hypothesis space under this bias and show the relationship between the specific boundary and general boundary with respect to unequivocal data, a special subset of the data space. We present experimental results on some public datasets.