(1 + ∞)-dimensional attractor neural networks
N S Skantzos; A C C Coolen; N S Skantzos; Department of Mathematics, King's College London, The Strand, London WC2R 2LS, UK; A C C Coolen; Department of Mathematics, King's College London, The Strand, London WC2R 2LS, UK
Журнал:
Journal of Physics A: Mathematical and General
Дата:
2000-08-25
Аннотация:
We solve a class of attractor neural network models with a mixture of 1D nearest-neighbour interactions and infinite-range interactions, which are both of a Hebbian-type form. Our solution is based on a combination of mean-field methods, transfer matrices, and 1D random-field techniques, and is obtained both for Boltzmann-type equilibrium (following sequential Glauber dynamics) and Peretto-type equilibrium (following parallel dynamics). Competition between the alignment forces mediated via short-range interactions, and those mediated via infinite-range ones, is found to generate novel phenomena, such as multiple locally stable `pure' states, first-order transitions between recall states, 2-cycles and non-recall states, and domain formation leading to extremely long relaxation times. We test our results against numerical simulations and simple benchmark cases, and find excellent agreement.
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