Learning deterministic DEC grammars is learning rational numbers

  • Authors:
  • Pieter Adriaans

  • Affiliations:
  • Department of Computer Science, University of Amsterdam, Amsterdam

  • Venue:
  • ICGI'06 Proceedings of the 8th international conference on Grammatical Inference: algorithms and applications
  • Year:
  • 2006
  • Learning as Data Compression

    CiE '07 Proceedings of the 3rd conference on Computability in Europe: Computation and Logic in the Real World

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Abstract

Below I show that the class of strings that can be learned by a deterministic DEC grammar is exactly the class of rational numbers between 0 and 1. I call this the class of semi-periodic or rational strings. Dynamically Expanding Context (Dec) grammars were introduced by Kohonen in order to model speech signals ([8]). They can be learned in quadratic time in the size of the grammar. They have been used successfully in the automatic generation and analysis of music ([7],[5],[6]).