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Finding the Maximizers of the Information Divergence From an Exponential Family

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1 Author(s)
Rauh, J. ; Max Planck Inst. for Math. in the Sci., Leipzig, Germany

This paper investigates maximizers of the information divergence from an exponential family ε. It is shown that the rI -projection of a maximizer P to ε is a convex combination of P and a probability measure P- with disjoint support and the same value of the sufficient statistics A. This observation can be used to transform the original problem of maximizing D(·∥ε) over the set of all probability measures into the maximization of a function D̅r over a convex subset of ker A. The global maximizers of both problems correspond to each other. Furthermore, finding all local maximizers of D̅r yields all local maximizers of D(·∥E). This paper also proposes two algorithms to find the maximizers of D̅r and applies them to two examples, where the maximizers of D(·∥ε) were not known before.

Published in:

Information Theory, IEEE Transactions on  (Volume:57 ,  Issue: 6 )

Date of Publication:

June 2011

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