Vidyasagar, M. (1990) An analysis of the equilibria of neural networks with linear interconnections Sadhana (Academy Proceedings in Engineering Sciences), 15 (4&5). pp. 283300. ISSN 02562499

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Official URL: http://www.ias.ac.in/j_archive/sadhana/15/4and5/28...
Related URL: http://dx.doi.org/10.1007/BF02811326
Abstract
In this paper, we analyse the equilibria of neural networks which consist of a set of sigmoid nonlinearities with linear interconnections, without assuming that the interconnections are symmetric or that there are no selfinteractions. By eliminating these assumptions, we are able to study the effects of imperfect implementation on the behaviour of Hopfield networks. If one views the neural network as evolving on the open ndimensional hypercube H = (0, 1)^{n} , we have the following conclusions as the neural characteristics become steeper and steeper: (i) There is at most one equilibrium in any compact subset of H, and under mild assumptions this equilibrium is unstable. In fact, the dimension of the stable manifold of this equilibrium is the same as the number of eigenvalues of the interconnection matrix with negative real parts. (ii) There might be some equilibria in the faces of H, and under mild conditions these are always unstable. Moreover, it is easy to compute the dimension of the stable manifold of each such equilibrium. (iii) A systematic procedure is given for determining which corners of the hypercube H contain equilibria, and it is shown that all equilibria in the corners ofH are asymptotically stable.
Item Type:  Article 

Source:  Copyright of this article belongs to Indian Academy of Sciences. 
Keywords:  Neural Networks; Linear Interconnections; Sigmoid Nonlinearities; Stability of Equilibria 
ID Code:  56909 
Deposited On:  25 Aug 2011 09:32 
Last Modified:  18 May 2016 08:31 
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