How to constrain Neural Network output?

Question

hinami 2020-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/598201-how-to-constrain-neural-network-output

回答： Aditya Patil 2020-9-25

采纳的回答： Aditya Patil

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Hi,

For my research purpose, I need to impose a constrain for the output layer. How to constrain the output values?

x = rand([3,100]);
t = rand([2,100]);
net = feedforwardnet([5 10]);
net = configure(net,x,t);
[net tr]=train(net,x,t);
mod=net(x(:,tr.testInd));
sum(mod)
>>ans =
  Columns 1 through 8
    1.2481    1.3790    1.2986    1.3004    1.2728    1.4082    1.2895    1.3355
  Columns 9 through 15
    1.3199    1.3409    1.2890    1.2890    1.3402    1.2568    1.3171

The above code is just an example.

As you can see, the sum of output values beyond 1, but I'd like to constrain the sum of the output values to be exactly equal to 1.

Could anyone help me?

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Answer 1

Aditya Patil 2020-9-25

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https://ww2.mathworks.cn/matlabcentral/answers/598201-how-to-constrain-neural-network-output#answer_500254

If you are trying to get outputs as probabilities, then you can use the softmax layer with a neural network. Feedforward network is a simple network that might not be appropriate for your task.