I tried to run the GAN programby MATLAB(https://www.mathworks.com/help/deeplearning/ug/train-generative-adversarial-network.html). I can run other programs prior to the Model Loss Function. When I tried to run the Model Loss function section, I cant click the Run button.
function [lossG,lossD,gradientsG,gradientsD,stateG,scoreG,scoreD] = ...
modelLoss(netG,netD,X,Z,flipProb)
% Calculate the predictions for real data with the discriminator network.
YReal = forward(netD,X);
% Calculate the predictions for generated data with the discriminator
% network.
[XGenerated,stateG] = forward(netG,Z);
YGenerated = forward(netD,XGenerated);
% Calculate the score of the discriminator.
scoreD = (mean(YReal) + mean(1-YGenerated)) / 2;
% Calculate the score of the generator.
scoreG = mean(YGenerated);
% Randomly flip the labels of the real images.
numObservations = size(YReal,4);
idx = rand(1,numObservations) < flipProb;
YReal(:,:,:,idx) = 1 - YReal(:,:,:,idx);
% Calculate the GAN loss.
[lossG, lossD] = ganLoss(YReal,YGenerated);
% For each network, calculate the gradients with respect to the loss.
gradientsG = dlgradient(lossG,netG.Learnables,RetainData=true);
gradientsD = dlgradient(lossD,netD.Learnables);
end
