Problem with Cross Validation Neural Network

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Mohammadreza Hesami 2018-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/404234-problem-with-cross-validation-neural-network

编辑： Mohammadreza Hesami 2018-7-3

Hi, I want to build a Cross-Validation neural network for a regression problem with trainlm as the training function and mse as the performance. I have run the network for more than 10 times but each time the errors for each step of K was 0 except the last step! For example when K=5, test errors will be :

error for K=1: 0

error for K=2: 0

error for K=3: 0

error for K=4: 0

error for K=5: "A large value"

My question is why only error is large for the last iteration of Cross-Validation? I would be so grateful if someone help me to know what is wrong with this network !. Thanks in advance.

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Greg Heath 2018-6-6

Have you double-checked equations 5 through 12?

Mohammadreza Hesami 2018-7-3

编辑：Mohammadreza Hesami 2018-7-3

Thanks Greg for your reply. Unfortunately, I can't get your point, could please tell me what do you mean by these equations or where can I find them ? Thanks in advance

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