How to get validation test and training errors of a neural network?

2 min readJun 18, 2021

I have created and trained a neural network using the following code .I want to know how to get the training testing and validation errors/mis-classifications the way we get using the matlab GUI.

trainFcn = 'trainscg';  % Scaled conjugate gradient backpropagation.   % Create a Pattern Recognition Network
   hiddenLayerSize = 25;
   net = patternnet(hiddenLayerSize);% Setup Division of Data for Training, Validation, Testing
net.divideParam.trainRatio = trainper/100;
net.divideParam.valRatio = valper/100;
net.divideParam.testRatio = testper/100; % Train the Network
[net,tr] = train(net,x,t);

ANSWER

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BOTH documentation commands

help patternnet
and
 doc patternnet

have the following sample code for CLASSIFICATION & PATTERN-RECOGNITION:

[x,t] = iris_dataset;
     net  = patternnet(10);
     net  = train(net,x,t);
     view(net)
     y = net(x);
     perf = perform(net,t,y);
     classes = vec2ind(y);

However, the following are missing

1. Dimensions of x and t 
 2. Plots of x, t, and t vs x
 3. Minimum possible number of hidden nodes
 4. Initial state of the RNG (Needed for duplication)
 5. Training record, tr

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