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An analysis of the exponential correlation associative memory

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2 Author(s)
Hancock, E.R. ; Dept. of Comput. Sci., York Univ., UK ; Pelillo, M.

The exponential correlation associative memory (ECAM) is a recurrent neural network model which has large storage capacity. Our aim in this paper is to show how the ECAM model can be entirely derived within a Bayesian framework, thereby providing more insight into the behaviour of this algorithm. The framework for our study is a novel relaxation method, which involves direct probabilistic modelling of the pattern corruption mechanism. The parameter of this model is the memoryless probability of error on nodes of the network. This bit-error probability is not only important for the interpretation of the ECAM model, but also allows us to understand some more general properties of Bayesian pattern reconstruction by relaxation. To study the dynamical behaviour of our relaxation model, we use the Hamming distance picture of Kanerva which allows us to understand how the bit-error probability evolves during the relaxation process. We also derive a parameter-free expression for the storage capacity of the model which, like a previous result of Chiueh and Goodman, scales exponentially with the number of nodes in the network

Published in:

Pattern Recognition, 1996., Proceedings of the 13th International Conference on  (Volume:4 )

Date of Conference:

25-29 Aug 1996

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