Design Architecture

Download Analysis of Neural Networks by Uwe an der Heiden (auth.) PDF

By Uwe an der Heiden (auth.)

The function of this paintings is a unified and normal remedy of job in neural networks from a mathematical standpoint. attainable purposes of the idea awarded are indica­ ted during the textual content. in spite of the fact that, they aren't explored in de­ tail for 2 purposes : first, the common personality of n- ral job in approximately all animals calls for a few kind of a common strategy~ secondly, the mathematical perspicuity might undergo if too many experimental info and empirical peculiarities have been interspersed one of the mathematical research. A consultant to many purposes is provided through the references touching on quite a few particular concerns. after all the idea doesn't goal at overlaying all person difficulties. additionally there are different ways to neural community thought (see e.g. Poggio-Torre, 1978) in response to the various lev­ els at which the fearful method might be considered. the idea is a deterministic one reflecting the common be­ havior of neurons or neuron swimming pools. during this admire the essay is written within the spirit of the paintings of Cowan, Feldman, and Wilson (see sect. 2.2). The networks are defined via structures of nonlinear critical equations. consequently the paper is additionally learn as a path in nonlinear procedure concept. the translation of the weather as neurons isn't an important one. despite the fact that, for vividness the mathematical effects are usually expressed in neurophysiological phrases, similar to excitation, inhibition, membrane potentials, and impulse frequencies. The nonlinearities are crucial components of the theory.

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I k l Proof. (i)Equ. (4. 31) implies vi =1). an arbitrary subset of {1,2, ... )=O. 31)only depends on the positive components v. ,v. •• ,v. of v. Addition of the equs. =1 v. 34) ~ 1+ (k-1)K For K< 1 the last expression is positive. Therefore k=n, and all components of v are positive. 31) is a linear system of equations, the coefficient matrix of which has a non-vanishing determinant if K*1. This implies that there is at most one positive solution. It is easily verified that vi=~/(1+(n-1)K) is a solution.

3). In this subsection vee) is considered as output of the network, and the question is in which way v depends on e. If vee) is uniquely determined this question concerns the properties of the map e"'- vee) If vee) is not unique then, since the system can be only in one of the steady states, the problem is through which of the several steady states the system will pass if e is continuously changed (in such a way that the system is always in a s~eady state),or more precisely, are there continuous branches of the multi-valued map e r - {vee») , and in which way does vee) depend on e if this map is restricted to one of its branches?

30) 1 4z ;)v2 'Jv 1 'd e 2 (e) . 'i)e 1 (e). 30)is sometimes accessible experimentally. If boundary conditions for the function Uij are known it is possible to derive an approximation of U.. if ~] sufficiently many values U1j {v j ) are obtained from equ. 30). 4 An example of spatial hysteresis This subsection contains a very simple example of a network with extremely many steady states. 3)). Assume a homogeneous structure of the network: all lateral inhibition coefficients K.. are identical, ~J K..

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