Predict output values from trained neural network

Question

Camila Gill 2020-4-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/517662-predict-output-values-from-trained-neural-network

编辑： Ameer Hamza 2020-4-14

采纳的回答： Ameer Hamza

fdm_trainingdata.m

在 MATLAB Online 中打开

Data set attached.

I have a trained neural network:

% Fit a feedforward neural network to a set of FDM processing data.
% Analysis of errors, computationally and visually.
%
% Input:  fdm_trainingdata.m file
%    Table with columns for:
%     layer thickness [mm], deposition speed [mm/s], elastic modulus [MPa],
%       tensile strength [MPa]
%    Separate arrays that define the 5 layer thicknesses and 5 deposition
%    speeds
%
% Output:
%    surface plots of neural network fit of elastic modulus and strength
%        errors between predictions of modulus and measured values
%        quadratic polynomial regression fits of modulus and strength
clear
% Read file; variables are 'trainingdata,' 'missing,' 'layerthick,' 
% 'speed' and 'inputmat'
    run('fdm_trainingdata.m');    
    inputs = trainingdata(:,1:2)';
    targets = trainingdata(:,3:4)';
%nvar = length(layerthick);
 
% Create a Fitting Network
    hiddenLayerSize = [15 15];
    net = fitnet(hiddenLayerSize);
% Set up Division of Data for Training, Validation, Testing
    net.divideParam.trainRatio = 1;
    net.divideParam.valRatio = 0;
    net.divideParam.testRatio = 0;
 
% Train the Network
[net,tr] = train(net,inputs,targets);
 
% Test the Network
    outputs = net(inputs);
    errors = gsubtract(outputs,targets);
    performance = perform(net,targets,outputs)
 
% View the Network
    view(net)

I need generate the modulus and strength prediction plots using matrices that are at least 25x26 in size.

How do I generate predictions using the trained network? I need to generate input vectors of (25x25 =) 625 elements so that I can plot the results using surf command.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Ameer Hamza 2020-4-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/517662-predict-output-values-from-trained-neural-network#answer_425966

编辑：Ameer Hamza 2020-4-14

在 MATLAB Online 中打开

Since your NN have two inputs so suppose you have two input matrices of size 25x25. Copy the following code and add it to the end of your current code.

[X,Y] = meshgrid(linspace(0,1,25), linspace(20,60,25)); % input needs to be meshgrid to be used with surf
out = net([X(:)'; Y(:)']);
out1 = reshape(out(1,:), 25, 25);
out2 = reshape(out(2,:), 25, 25);
figure();
surf(X,Y,out1);
figure();
surf(X,Y,out2);