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Explanation-based generalization and constraint propagation with interval labels

  • Kai Zercher
Part 4: Theorem Proving And EBL
Part of the Lecture Notes in Computer Science book series (LNCS, volume 482)

Abstract

Two ways of applying EBG to constraint propagation with interval labels are presented. The first method, CP-EBG-1, is described by a straightforward use of a Prolog EBG implementation. The second, CP-EBG-2, performs two phases: First, constraint propagation is done and, using EBG, a generalized final labelling is derived but no extra conditions are learned. Second, constraint propagation is again performed using the final labellings of phase 1 as the initial labelling. This time, conditions are learned which form the desired concept description.

It is shown that CP-EBG-2 learns more general concept descriptions than CP-EBG-1. A proof is outlined that CP-EBG-2 produces correct concept descriptions for the class of constraints using linear equations and interval arithmetic. Central to this proof- and to possible proofs for other constraint classes - is the notion of a moderate generalization. It guarantees that a generalization which was learned from one instance and which is now used in a new situation, does not lead to the exclusion of any solution for this new situation.

Keywords

Explanation-based generalization constraint propagation interval labels moderate generalization 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Kai Zercher
    • 1
    • 2
  1. 1.Siemens AG, ZFE IS INF 33München 83
  2. 2.TU München, Institut für InformatikMünchen 80Germany

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