How Does Matlab Neural Network Toolbox Preprocess Data?

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Christian Kruschel
回答： Greg Heath 2016-9-6
I try to analyse my neural network trained via Neural Network Toolbox and Matlab 2016a. I was wondering how Matlab preprocesses data. I tried the following: X = -1:.1:1, Y = purelin(2*tansig(X) + tanig(X) -2) and trained a Feedforward Net, lets call it "net", with one hidden Layer and two neurons with tansig activations. I thought net(X(k)) is the same as purelin(net.LW{2,1}*tansig(net.IW{1}*X(k)-net.b{1})-net.b{2}) for any feasible index k, but this is not right. What did I do wrong or is there some hidden preprocessing?
Thanks for any answer!

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回答（1 个）

Greg Heath
Greg Heath 2016-9-6
You forgot the default input and target normalization with MAPMINMAX followed by the output denormalization.
Hope this helps.
Thank you for formally accepting my answer
Greg

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