manaully remake neural network from example

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soepblik 2020-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/672338-manaully-remake-neural-network-from-example

编辑： soepblik 2020-12-8

Hi,

i am trying to manually calculate the output values for the neural network which is made in this example: https://nl.mathworks.com/help/comm/ug/training-and-testing-a-neural-network-for-llr-estimation.html. (the Network for the 16-QAM).

it has 2 inputs, 1 hidden layer with 8 neurons and an output layer with 4 neurons.

I try to calculate the output values manually. But i get different results than the calculated values from the script.

My script now:

    w1 = net.IW{1} %the input-to-hidden layer weights
    w2 = net.LW{2} %the hidden-to-output layer weights
    b1 = net.b{1} %the input-to-hidden layer bias
    b2 = net.b{2} %the hidden-to-output layer bias
    % Layer 1
    a1 = tansig(repmat(b1,1,size(x,2)) + w1*x); 
    % output
    n=repmat(b2,1,size(x,2)) + w2*a1;
    output= purelin(n);