MATLAB: How is the output layer characterized in the neural network toolbox

Question

Hello everyone,

I have created a neural network with one hidden layer and one output layer. Overall there are two input elements and 24 output elements. I am working with 10 hidden neurons in the hidden layer.

Now when I run view(net) the graphical overview shows me that I have two input elements, 10 hidden neurons in the hidden layer and 24 output elements. The graphic also shows me the output layer. Under the output layer the number 11 is displayed..

What does this number stand for? Is it a number for the output neurons? Why isn't it 24 then? Until now I always worked with neural networks with only one output. When running view(net) with those networks there was always the number 1 displayed under the output layer…

Thanks alot!

Answer 1

Your code looks ok. However, since the figure shows 3 inputs, I question your quoted sizes. Insert the following statements

 inputs = input % this is a 2x194 matrix
 targets = target; % this is a 24x194 matrix
 [ I N ] = size(inputs)
 [ O N ] = size(targets)
 ...
[net_cloudy, tr] = train(net_cloudy, inputs, targets);
 view(net_cloudy)
 ...
 whos        % check cell and double sizes

Hope this helps.

Thank you for formally accepting my answer

Greg