Predictive complexity and information

  • Authors:
  • Michael V. Vyugin;Vladimir V. V'yugin

  • Affiliations:
  • Department of Computer Science, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK;Institute for Information Transmission Problems, Russian Academy of Sciences, Bol'shoi Karetnyi per. 19, Moscow GSP-4, 101447, Russia

  • Venue:
  • Journal of Computer and System Sciences - Special issue on COLT 2002
  • Year:
  • 2005

Quantified Score

Hi-index 0.01

Visualization

Abstract

The notions of predictive complexity and of corresponding amount of information are considered. Predictive complexity is a generalization of Kolmogorov complexity which bounds the ability of any algorithm to predict elements of a sequence of outcomes. We consider predictive complexity for a wide class of bounded loss functions which are generalizations of square-loss function. Relations between unconditional KG(x) and conditional KG(x|y) predictive complexities are studied. We define an algorithm which has some ''expanding property''. It transforms with positive probability sequences of given predictive complexity into sequences of essentially bigger predictive complexity. A concept of amount of predictive information IG(y:x) is studied. We show that this information is noncommutative in a very strong sense and present asymptotic relations between values IG(y:x), IG(x:y), KG(x) and KG(y).