代码来源

代码全文


clear all; close all; clc;
%% Basic Generative Adversarial Network
%% Load Data
load('mnistAll.mat')
trainX = preprocess(mnist.train_images);
trainY = mnist.train_labels;
testX = preprocess(mnist.test_images);
testY = mnist.test_labels;
%% Settings
settings.latent_dim = 100;
settings.batch_size = 32; settings.image_size = [28,28,1];
settings.lrD = 0.0002; settings.lrG = 0.0002; settings.beta1 = 0.5;
settings.beta2 = 0.999; settings.maxepochs = 50;%% Initialization
%% Generator
paramsGen.FCW1 = dlarray(...initializeGaussian([256,settings.latent_dim],.02));
paramsGen.FCb1 = dlarray(zeros(256,1,'single'));
paramsGen.BNo1 = dlarray(zeros(256,1,'single'));
paramsGen.BNs1 = dlarray(ones(256,1,'single'));
paramsGen.FCW2 = dlarray(initializeGaussian([512,256]));
paramsGen.FCb2 = dlarray(zeros(512,1,'single'));
paramsGen.BNo2 = dlarray(zeros(512,1,'single'));
paramsGen.BNs2 = dlarray(ones(512,1,'single'));
paramsGen.FCW3 = dlarray(initializeGaussian([1024,512]));
paramsGen.FCb3 = dlarray(zeros(1024,1,'single'));
paramsGen.BNo3 = dlarray(zeros(1024,1,'single'));
paramsGen.BNs3 = dlarray(ones(1024,1,'single'));
paramsGen.FCW4 = dlarray(initializeGaussian(...[prod(settings.image_size),1024]));
paramsGen.FCb4 = dlarray(zeros(prod(settings.image_size)...,1,'single'));stGen.BN1 = []; stGen.BN2 = []; stGen.BN3 = [];%% Discriminator
paramsDis.FCW1 = dlarray(initializeGaussian([1024,...prod(settings.image_size)],.02));
paramsDis.FCb1 = dlarray(zeros(1024,1,'single'));
paramsDis.BNo1 = dlarray(zeros(1024,1,'single'));
paramsDis.BNs1 = dlarray(ones(1024,1,'single'));
paramsDis.FCW2 = dlarray(initializeGaussian([512,1024]));
paramsDis.FCb2 = dlarray(zeros(512,1,'single'));
paramsDis.BNo2 = dlarray(zeros(512,1,'single'));
paramsDis.BNs2 = dlarray(ones(512,1,'single'));
paramsDis.FCW3 = dlarray(initializeGaussian([256,512]));
paramsDis.FCb3 = dlarray(zeros(256,1,'single'));
paramsDis.FCW4 = dlarray(initializeGaussian([1,256]));
paramsDis.FCb4 = dlarray(zeros(1,1,'single'));stDis.BN1 = []; stDis.BN2 = [];% average Gradient and average Gradient squared holders
avgG.Dis = []; avgGS.Dis = []; avgG.Gen = []; avgGS.Gen = [];
%% Train
numIterations = floor(size(trainX,2)/settings.batch_size);
out = false; epoch = 0; global_iter = 0;
while ~outtic; trainXshuffle = trainX(:,randperm(size(trainX,2)));fprintf('Epoch %d\n',epoch) for i=1:numIterationsglobal_iter = global_iter+1;noise = gpdl(randn([settings.latent_dim,...settings.batch_size]),'CB');idx = (i-1)*settings.batch_size+1:i*settings.batch_size;XBatch=gpdl(single(trainXshuffle(:,idx)),'CB');[GradGen,GradDis,stGen,stDis] = ...dlfeval(@modelGradients,XBatch,noise,...paramsGen,paramsDis,stGen,stDis);% Update Discriminator network parameters[paramsDis,avgG.Dis,avgGS.Dis] = ...adamupdate(paramsDis, GradDis, ...avgG.Dis, avgGS.Dis, global_iter, ...settings.lrD, settings.beta1, settings.beta2);% Update Generator network parameters[paramsGen,avgG.Gen,avgGS.Gen] = ...adamupdate(paramsGen, GradGen, ...avgG.Gen, avgGS.Gen, global_iter, ...settings.lrG, settings.beta1, settings.beta2);if i==1 || rem(i,20)==0progressplot(paramsGen,stGen,settings);
%             if i==1 || (epoch>=0 && i==1)
%                 h = gcf;
%                 % Capture the plot as an image
%                 frame = getframe(h);
%                 im = frame2im(frame);
%                 [imind,cm] = rgb2ind(im,256);
%                 % Write to the GIF File
%                 if epoch == 0
%                   imwrite(imind,cm,'GANmnist.gif','gif', 'Loopcount',inf);
%                 else
%                   imwrite(imind,cm,'GANmnist.gif','gif','WriteMode','append');
%                 end
%             endendendelapsedTime = toc;disp("Epoch "+epoch+". Time taken for epoch = "+elapsedTime + "s")epoch = epoch+1;if epoch == settings.maxepochsout = true;end
end
%% Helper Functions
%% preprocess
function x = preprocess(x)
x = double(x)/255;
x = (x-.5)/.5;
x = reshape(x,28*28,[]);
end
%% extract data
function x = gatext(x)
x = gather(extractdata(x));
end
%% gpu dl array wrapper
function dlx = gpdl(x,labels)
dlx = gpuArray(dlarray(x,labels));
end
%% Weight initialization
function parameter = initializeGaussian(parameterSize,sigma)
if nargin < 2sigma = 0.05;
end
parameter = randn(parameterSize, 'single') .* sigma;
end
%% Generator
function [dly,st] = Generator(dlx,params,st)
% fully connected
%1
dly = fullyconnect(dlx,params.FCW1,params.FCb1);
dly = leakyrelu(dly,0.2);
% if isempty(st.BN1)
%     [dly,st.BN1.mu,st.BN1.sig] = batchnorm(dly,params.BNo1,params.BNs1);
% else
%     [dly,st.BN1.mu,st.BN1.sig] = batchnorm(dly,params.BNo1,...
%         params.BNs1,st.BN1.mu,st.BN1.sig);
% end
%2
dly = fullyconnect(dly,params.FCW2,params.FCb2);
dly = leakyrelu(dly,0.2);
% if isempty(st.BN2)
%     [dly,st.BN2.mu,st.BN2.sig] = batchnorm(dly,params.BNo2,params.BNs2);
% else
%     [dly,st.BN2.mu,st.BN2.sig] = batchnorm(dly,params.BNo2,...
%         params.BNs2,st.BN2.mu,st.BN2.sig);
% end
%3
dly = fullyconnect(dly,params.FCW3,params.FCb3);
dly = leakyrelu(dly,0.2);
% if isempty(st.BN3)
%     [dly,st.BN3.mu,st.BN3.sig] = batchnorm(dly,params.BNo3,params.BNs3);
% else
%     [dly,st.BN3.mu,st.BN3.sig] = batchnorm(dly,params.BNo3,...
%         params.BNs3,st.BN3.mu,st.BN3.sig);
% end
%4
dly = fullyconnect(dly,params.FCW4,params.FCb4);
% tanh
dly = tanh(dly);
end
%% Discriminator
function [dly,st] = Discriminator(dlx,params,st)
% fully connected
%1
dly = fullyconnect(dlx,params.FCW1,params.FCb1);
dly = leakyrelu(dly,0.2);
dly = dropout(dly);
% if isempty(st.BN1)
%     [dly,st.BN1.mu,st.BN1.sig] = batchnorm(dly,params.BNo1,params.BNs1);
% else
%     [dly,st.BN1.mu,st.BN1.sig] = batchnorm(dly,params.BNo1,...
%         params.BNs1,st.BN1.mu,st.BN1.sig);
% end
%2
dly = fullyconnect(dly,params.FCW2,params.FCb2);
dly = leakyrelu(dly,0.2);
dly = dropout(dly);
% if isempty(st.BN2)
%     [dly,st.BN2.mu,st.BN2.sig] = batchnorm(dly,params.BNo2,params.BNs2);
% else
%     [dly,st.BN2.mu,st.BN2.sig] = batchnorm(dly,params.BNo2,...
%         params.BNs2,st.BN2.mu,st.BN2.sig);
% end
%3
dly = fullyconnect(dly,params.FCW3,params.FCb3);
dly = leakyrelu(dly,0.2);
dly = dropout(dly);
%4
dly = fullyconnect(dly,params.FCW4,params.FCb4);
% sigmoid
dly = sigmoid(dly);
end
%% modelGradients
function [GradGen,GradDis,stGen,stDis]=modelGradients(x,z,paramsGen,...paramsDis,stGen,stDis)
[fake_images,stGen] = Generator(z,paramsGen,stGen);
d_output_real = Discriminator(x,paramsDis,stDis);
[d_output_fake,stDis] = Discriminator(fake_images,paramsDis,stDis);% Loss due to true or not
d_loss = -mean(.9*log(d_output_real+eps)+log(1-d_output_fake+eps));
g_loss = -mean(log(d_output_fake+eps));% For each network, calculate the gradients with respect to the loss.
GradGen = dlgradient(g_loss,paramsGen,'RetainData',true);
GradDis = dlgradient(d_loss,paramsDis);
end
%% progressplot
function progressplot(paramsGen,stGen,settings)
r = 5; c = 5;
noise = gpdl(randn([settings.latent_dim,r*c]),'CB');
gen_imgs = Generator(noise,paramsGen,stGen);
gen_imgs = reshape(gen_imgs,28,28,[]);fig = gcf;
if ~isempty(fig.Children)delete(fig.Children)
endI = imtile(gatext(gen_imgs));
I = rescale(I);
imagesc(I)
title("Generated Images")
colormap graydrawnow;
end
%% dropout
function dly = dropout(dlx,p)
if nargin < 2p = .3;
end
n = p*10;
mask = randi([1,10],size(dlx));
mask(mask<=n)=0;
mask(mask>n)=1;
dly = dlx.*

代码展示

本代码采用MNIST手写数字数据集（训练集60000个，测试集10000个，本例中采用训练集数据）,可实现数据集自动下载，最大的epoch次数为50,单个epoch中有1875个batch,batch_size为32，结果迭代如下：

第0次迭代

第10次迭代

第20次迭代

第30次迭代

第40次迭代

第50迭代

代码以及相关资料附件

ggg9

内容简介：

1、上述网址源代码压缩包（本文代码在...\github_repo\GAN下，GAN.m文件）

2、生成对抗网络的源文献

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GAN之生成对抗网络（Matlab）

代码全文

代码展示

代码以及相关资料附件

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