neighborhood function in SOM

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Chenghao 2012-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/52106-neighborhood-function-in-som

回答： gunjan 2018-4-24

I am using self organizing map in MATLAB (R2011a) Neural Network Toolbox Version 7.0.1 with "selforgmap()" command. There are several neighborhood function such as gaussian, bubble and so on. However, I could not find any materials where I can set the type of neighborhood function in the code of SOM. Can anyone tell me?

Thank you.

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Answer 1

gunjan 2018-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/52106-neighborhood-function-in-som#answer_316996

https://www.mathworks.com/help/nnet/ug/cluster-with-self-organizing-map-neural-network.html#bss4b_l-3

check this.. it says that the weights are updated : W(k+1) = W(k) + alpha * [ (dist) ] rule.. where dist = distance between current neuron that you are updating and the winning neuron. k = iteration number alpha = learning rate