how to predict from a trained neural network ?

Greg_keath - 2021-06-29T12:16:10+00:00

Question: how to predict from a trained neural network ?

Hello I am trying to use neural network to make some prediction based on my input and target data. I have read all related tutorial in Matlab and also looked at the matlab examples. I kinda learned how to develop a network but I dont know how to use this train network to make some prediction ? is there any code that im missing ? does anyone have a sample script that can be shared here? that's what I have, for example : x=[1 2 3;4 5 3] t=[0.5 0.6 0.7] , net=feedforwardnet(10) , net=train(net,x,t) , perf=perform(net,y,t) how can I predict the output for a new set of x (xprime=[4 2 3;4 7 8]) based on this trained network? thanks

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Expert Answer

John Williams answered . 2025-11-20

 1. [ net tr ] = train(net,x,t);
           y   = net(x);
           e   = t-y;

 2. [ net tr y e ] = train(net,x,t);  % My favorite

then, in general,

    NMSE = mse(e)/mean(var(t',1))

or for 1-dimensional outputs

   NMSE =  mse(e)/var(t,1)

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