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Cooperative updating in the Hopfield model

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3 Author(s)
Munehisa, T. ; Fac. of Eng., Yamanashi Univ., Kofu, Japan ; Kobayashi, M. ; Yamazaki, H.

We propose a new method for updating units in the Hopfield model. With this method two or more units change at the same time, so as to become the lowest energy state among all possible states. Since this updating algorithm is based on the detailed balance equation, convergence to the Boltzmann distribution is guaranteed. If our algorithm is applied to finding the minimum energy in constraint satisfaction and combinatorial optimization problems, then there is a faster convergence than those with the usual algorithm in the neural network. This is shown by experiments with the travelling salesman problem, the four-color problem, the N-queen problem, and the graph bi-partitioning problem. In constraint satisfaction problems, for which earlier neural networks are effective in some cases, our updating scheme works fine. Even though we still encounter the problem of ending up in local minima, our updating scheme has a great advantage compared with the usual updating scheme used in combinatorial optimization problems. Also, we discuss parallel computing using our updating algorithm

Published in:

Neural Networks, IEEE Transactions on  (Volume:12 ,  Issue: 5 )

Date of Publication:

Sep 2001

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