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

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Newman
Newman 2016-7-30
编辑： Mohamed Nedal 2019-12-14
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);

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采纳的回答

Greg Heath
Greg Heath 2016-8-5
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
6. Plots of e = y-t vs x
7. Misclassified cases
8. trn/val/tst Error rates
For details see my NEWSGROUP posts
SIZES OF MATLAB CLASSIFICATION EXAMPLE DATA SETS
http://www.mathworks.com/matlabcentral/newsreader/...
view_thread/339984
and
BEYOND THE HELP/DOC DOCUMENTATION : PATTERNNET for
NN Classification and PatternRecognition
http://www.mathworks.com/matlabcentral/newsreader/...
view_thread/344832
Hope this helps.
Thank you for formally accepting my answer
Greg
  2 个评论
Anton Tichenko
Anton Tichenko 2019-4-19
Hi Greg,
Noticed in a few answers here you are referring to "THE HELP/DOC DOCUMENTATION : PATTERNNET for NN Classification and PatternRecognition" and "SIZES OF MATLAB CLASSIFICATION EXAMPLE DATA SETS" posts
I can't find them anywhere, have they been removed? Any chance you could share again?
Thanks!
Greg Heath
Greg Heath 2019-4-20
help and doc are to be used in the MATLAB command line. For example
>> help patternnet
patternnet Pattern recognition neural network.
...
Hope this helps
Greg

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更多回答（1 个）

Greg Heath
Greg Heath 2016-7-31
clear all, clc
[ x, t ] = simplefit_dataset;
net = fitnet;
rng('default') % For reproducibility
[ net tr y e ] = train( net, x, t );
% y = net(x); e = t - y;
tr = tr % No semicolon: LOOK AT ALL OF THE GOODIES!!!
msetrn = tr.best_perf
mseval = tr.best_vperf
msetst = tr.best_tperf
Hope this helps
Thank you for formally accepting my answer
Greg
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Mohamed Nedal
Mohamed Nedal 2019-11-30
编辑：Mohamed Nedal 2019-12-14
Dear @Greg,
Could you please elaporate on the difference between msetrn, mseval, and msetst?
If I want to assess the overall performance of the NN and want to find the MSE for the NN as a whole, Which one should I use?

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