TCB Publications - Abstract

Klaus Obermayer, Helge Ritter, and Klaus Schulten. Large-scale simulations of self-organizing neural networks on parallel computers: Application to biological modelling. Parallel Computing, 14:381-404, 1990.

OBER90D In this contribution we report about a study of a very versatile neural network algorithm known as "Self-organizing Feature Maps" and based on earlier work of Kohonen[1,2]. In its original version, the algorithm addresses a fundamental issue of brain organization, namely how topographically ordered maps of sensory information can be formed by learning. This algorithm is investigated for a larger number of neurons (up to 16K) and for an input space of dimension d (less than or equal to) 900. To meet the computational demands this algorithm was implemented on two parallel machines, on a self-built Transputer systolic ring and on a Connection Machine CM-2. We will present below (i) a simulation based on the feature map algorithm modelling part of the synaptic organization in the "hand-region" of the somatosensory cortex, (ii) a study of the influence of the dimension of the input-space on the learning process, (iii) a simulation of the extended algorithm, which explicitly includes lateral interactions, and (iv) a comparison of the transputer-based "coarse-grained" implementation of the model, and the "fine-grained" implementation of the same system on the Connection Machine.

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