Artificial Neural Networks Hidden Layers

Question

Tiago Dias 2019-7-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/473406-artificial-neural-networks-hidden-layers

回答： Sneha Bachhu 2020-11-12

采纳的回答： Greg Heath

在 MATLAB Online 中打开

Hello,

Below is my code to build a neural netword.

Question 1

n defines the number of nodes in the hidden layer. How can i define more nodes to the output hidden layer? or the fact it is 1 because i have only 1 output variable?

Question 2

Is it possible to set, for example, 2 hidden layers, of 15 neuros and 5 neuros respectively?

---------------------------------

%% ANN --------------------------------------------------------------------
% Define X
X = predictors;
% Define Y
Y = Y_MOTOR;
% Define a neural network (variable called 'net' which is a 3 layer
% perceptron with n nodes in the hidden layer
n = 25;
net = feedforwardnet(n);
% Train network
[net, TR] = train(net, X', Y');
% Prediction
Y_model = zeros(length(Y),1);
for i = 1:length(Y)
    % Simulate Neural Network
    Y_model(i) = net([X(i,:)]'); 
    % Input of net, must be a column vector
end

Thanks for your time

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Answer 1

Greg Heath 2019-7-25

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Number of input and output nodes is determined by the data.

Number of hidden layers and nodes is determined by the program author.

Hope this helps

Thank you for formally accepting my answer,

Greg

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Tiago Dias 2019-7-25

Thanks for your comment, still got some doubts.

I set 25 nodes for the hidden layer, for the box with the "layer" title.

The value 1 for the box that is surroing "b" , "W" labeled as output, i didn't set for value 1, can change this value (red arrow)?

Or that value is 1 cause the Output green square has 1 as well?

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Answer 2

Sneha Bachhu 2020-11-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/473406-artificial-neural-networks-hidden-layers#answer_541893

Hi all,

I am working on neural network to study cancer data, using test and training datasets, with the hidden layers ranging 5 to 100 and for 4 different ANNs 1,2,5,10. Exit condition for ANN is at least 2000 epochs.