Number of inputs does not match net.numInputs. Custom-made net problem.

Hello,

I am composing my own custom net for use in a school project.

I am currenly basing my code off an example in the MATLAB documentation and I was able to get that documentation code to work.

However I am now trying to read in my own data from an excel sheet and run the net using this data, and this is where I run into the error.

The data reads into correctly, however the error reads "Number of inputs does not match net.numInputs."

I put in some debugging code so see the size of my inputs and the result is below.

The input is clearly an array of 3x21135.

In my code I have defined the input as 3 as shown below.

Any help would be apprciated.

net = network;
net.numInputs = 3;
net.numLayers = 3;
net.biasConnect(1) = 1;
net.biasConnect(3) = 1;
net.inputConnect(1,1) = 1;
net.inputConnect(2,1) = 1;
net.inputConnect(2,2) = 1;
net.inputConnect(3,1) = 1;
net.inputConnect(2,3) = 1;
net.inputConnect(3,3) = 1;
net.layerConnect = [0 0 0; 0 0 0; 1 1 1];
net.outputConnect = [0 1 1];
net.inputs{1}.processFcns = {'removeconstantrows','mapminmax'};
net.layers{1}.size = 4;
net.layers{1}.transferFcn = 'tansig';
net.layers{1}.initFcn = 'initnw';
net.layers{2}.size = 3;
net.layers{2}.transferFcn = 'logsig';
net.layers{2}.initFcn = 'initnw';
net.layers{3}.initFcn = 'initnw';
net.inputWeights{2,1}.delays = [0 1];
net.inputWeights{2,2}.delays = 1;
net.layerWeights{3,3}.delays = 1;
net.initFcn = 'initlay';
net.performFcn = 'mse';
net.trainFcn = 'trainlm';
net.divideFcn = 'dividerand';
net.plotFcns = {'plotperform','plottrainstate'};

Answer 1

[TED MOSBY]

Hi,

To remove the above error, you can do the following changes in the code:

net.numInputs = 1;

net.numInputs = 3; tells MATLAB that the network expects three independent input ports. You were feeding a single numeric matrix, so MATLAB saw only one incoming port. Changing the value to 1 aligns the definition (one port) with the data you actually pass.

You can delete all inputConnect references to columns 2 & 3 as those ports no longer exist.

Add the following line:

net.inputs{1}.size = 3;

It tells MATLAB how many features arrive on that port.

Hope this helps!