Geometrical concept learning and convex polytopes

  • Authors:
  • Tibor Hegedűs

  • Affiliations:
  • Comenius Univ., Bratislava, Slovakia

  • Venue:
  • COLT '94 Proceedings of the seventh annual conference on Computational learning theory
  • Year:
  • 1994

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Abstract

We consider exact identification of geometrical objects over the domain {0,1,…,n−1}d, d≥1 fixed. We give efficient implementations of the general incremental scheme “identify the target concept by constructing its convex hull” for learning convex concepts. This approach is of interest for intersections of half-spaces over the considered domain, as the convex hull of a concept of this type is known to have “few” vertices. In this case we obtain positive results on learning intersections of halfspaces with superset/disjointedness queries, and on learning single halfspaces with membership queries. We believe that the presented paradigm may become important for neural networks with a fixed number of discrete inputs.