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Inference and Mutual Information on Random Factor Graphs

Authors Amin Coja-Oghlan, Max Hahn-Klimroth, Philipp Loick, Noela Müller, Konstantinos Panagiotou, Matija Pasch



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Author Details

Amin Coja-Oghlan
  • Mathematics Institute, Goethe Universität Frankfurt am Main, Germany
Max Hahn-Klimroth
  • Mathematics Institute, Goethe Universität Frankfurt am Main, Germany
Philipp Loick
  • Mathematics Institute, Goethe Universität Frankfurt am Main, Germany
Noela Müller
  • Mathematics Institute, University of Munich, Germany
Konstantinos Panagiotou
  • Mathematics Institute, University of Munich, Germany
Matija Pasch
  • Mathematics Institute, University of Munich, Germany

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Amin Coja-Oghlan, Max Hahn-Klimroth, Philipp Loick, Noela Müller, Konstantinos Panagiotou, and Matija Pasch. Inference and Mutual Information on Random Factor Graphs. In 38th International Symposium on Theoretical Aspects of Computer Science (STACS 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 187, pp. 24:1-24:15, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)
https://doi.org/10.4230/LIPIcs.STACS.2021.24

Abstract

Random factor graphs provide a powerful framework for the study of inference problems such as decoding problems or the stochastic block model. Information-theoretically the key quantity of interest is the mutual information between the observed factor graph and the underlying ground truth around which the factor graph was created; in the stochastic block model, this would be the planted partition. The mutual information gauges whether and how well the ground truth can be inferred from the observable data. For a very general model of random factor graphs we verify a formula for the mutual information predicted by physics techniques. As an application we prove a conjecture about low-density generator matrix codes from [Montanari: IEEE Transactions on Information Theory 2005]. Further applications include phase transitions of the stochastic block model and the mixed k-spin model from physics.

Subject Classification

ACM Subject Classification
  • Mathematics of computing → Probabilistic inference problems
Keywords
  • Information theory
  • random factor graphs
  • inference problems
  • phase transitions

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