Neural Networks with constrains

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Yonny Muñoz Muñoz 2023-5-25

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回答： Shubham 2023-6-1

Hello,

I am using the NN toolbox to solve a problem target = F(variables) and It works really good. However, I need that every inputs into "variables" be positive. Is it possible to do it in Matlab?

Thank you very much

Yonny

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Yonny Muñoz Muñoz 2023-5-25

So, the thing is that "variables" are calculated by using the targets that the NN predicts, i.e. "variables" is a "post-processing" vector. It would be great to write into the NN code that those "variables" should be positive, so that once I calculate them with another postprocessing code they are all positive.

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Answer 1

Shubham 2023-6-1

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在 MATLAB Online 中打开

Hi Yonny,

Yes, it is possible to constrain the inputs to your neural network to be positive using the MATLAB NN Toolbox.

One way you can achieve this is by preprocessing your data before training the network. You can use MATLAB's mapminmax function to scale your input data to a range of [0, 1] and then multiply the scaled data by the maximum value of your input variables to ensure that all inputs are positive.

Here's an example code snippet that shows how you can apply this preprocessing step:

% Assume that your input data is stored in an n-by-m matrix X, where n is the number of samples and m is the number of variables.
% Scale the input data to [0, 1]
[X_scaled, PS] = mapminmax(X');
X_scaled = X_scaled';
% Multiply the scaled data by the maximum value of your input variables
max_vals = max(X);
X_pos = X_scaled .* repmat(max_vals, n, 1);