Inductive inference of approximations for recursive concepts

  • Authors:
  • Steffen Lange;Gunter Grieser;Thomas Zeugmann

  • Affiliations:
  • FH Darmstadt, FB Informatik, Haardring, Darmstadt, Germany;FB Informatik, Technische Universität Darmstadt, Alexanderstraße, Darmstadt, Germany;Hokkaido University, Division of Computer Science, Sapporo, Japan

  • Venue:
  • Theoretical Computer Science - Algorithmic learning theory (ALT 2000)
  • Year:
  • 2005

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Abstract

This paper provides a systematic study of inductive inference of indexable concept classes in learning scenarios where the learner is successful if its final hypothesis describes a finite variant of the target concept, i.e., learning with anomalies. Learning from positive data only and from both positive and negative data is distinguished.The following learning models are studied: learning in the limit, finite identification, set-driven learning, conservative inference, and behaviorally correct learning.The attention is focused on the case that the number of allowed anomalies is finite but not a priori bounded. However, results for the special case of learning with an a priori bounded number of anomalies are presented, too. Characterizations of the learning models with anomalies in terms of finite tell-tale sets are provided. The observed varieties in the degree of recursiveness of the relevant tell-tale sets are already sufficient to quantify the differences in the corresponding learning models with anomalies. Finally, a complete picture concerning the relations of all models of learning with and without anomalies mentioned above is derived.