Net_D = Discriminator()
Net_G = Generator()
if GPU_NUMS > 1:
Net_G.cuda()
Net_D.cuda()
Net_D = DataParallel(Net_D)
Net_G = DataParallel(Net_G)
G_optimizer = Adam(Net_G.parameters(), lr=LR, betas=(0.5, 0.999))
D_optimizer = Adam(Net_G.parameters(), lr=LR, betas=(0.5, 0.999))
label_true = torch.ones(BATCH_SIZE)
label_false = torch.zeros(BATCH_SIZE)
label_true_var = Variable(label_true.cuda() if GPU_NUMS > 1 else label_true)
label_false_var = Variable(label_false.cuda() if GPU_NUMS > 1 else label_false)
proBar = ProgressBar(EPOCHS, len(train_loader), "D loss:%.3f; G loss:%.3f")
for epoch in range(EPOCHS):
for image, label in train_loader:
label = one_hot(label.long().squeeze())
image_var = Variable(image.cuda() if GPU_NUMS > 1 else image)
label_var = Variable(label.cuda() if GPU_NUMS > 1 else label)
Noise_var = Variable(torch.randn(BATCH_SIZE, NOISE_DIM))
'''
训练判别器
'''
Net_D.zero_grad()
D_real = Net_D(image_var, label_var)
D_real_loss = BCELoss()(D_real, label_true_var)
image_fake = Net_G(Noise_var, label_var)
optimizerD = Adam(netd.parameters(),lr=opt.lr,betas=(opt.beta1,0.999))
optimizerG = Adam(netg.parameters(),lr=opt.lr,betas=(opt.beta1,0.999))
# criterion
criterion = nn.BCELoss()
fix_noise = Variable(t.FloatTensor(opt.batch_size,opt.nz,1,1).normal_(0,1))
if opt.GPU_NUMS > 1:
fix_noise = fix_noise.cuda()
netd.cuda()
netg.cuda()
criterion.cuda() # it's a good habit
print('begin training, be patient')
bar = ProgressBar(opt.max_epoch, len(dataloader), "D Loss:%.3f;G Loss:%.3f")
for epoch in range(opt.max_epoch):
for ii, data in enumerate(dataloader,0):
real,_=data
input = Variable(real)
label = Variable(t.ones(input.size(0))) # 1 for real
noise = t.randn(input.size(0),opt.nz,1,1)
noise = Variable(noise)
if opt.GPU_NUMS > 1:
noise = noise.cuda()
input = input.cuda()
label = label.cuda()
# ----- train netd -----
netd.zero_grad()
fake_labels = Variable(t.zeros(config.BATCH_SIZE))
fix_noises = Variable(t.randn(config.BATCH_SIZE, config.NOISE_Z, 1, 1))
noises = Variable(t.randn(config.BATCH_SIZE, config.NOISE_Z, 1, 1))
# errord_meter = AverageValueMeter()
# errorg_meter = AverageValueMeter()
if config.GPU_NUM > 1:
netD.cuda()
netG.cuda()
criterion.cuda()
true_labels, fake_labels = true_labels.cuda(), fake_labels.cuda()
fix_noises, noises = fix_noises.cuda(), noises.cuda()
epochs = range(config.EPOCH_NUM)
proBar = ProgressBar(config.EPOCH_NUM, len(dataLoader),
"D Loss:%.3f;G Loss:%.3f")
for epoch in iter(epochs):
for ii, (img, _) in enumerate(dataLoader):
real_img = Variable(img)
if config.GPU_NUM > 1:
real_img = real_img.cuda()
if ii % config.D_EVERY == 0:
# 训练判别器
optimizer_discriminator.zero_grad()
## 尽可能的把真图片判别为正确
output = netD(real_img)
error_d_real = criterion(output, true_labels)
error_d_real.backward()
## 尽可能把假图片判别为错误
noises.data.copy_(
def sample_images(epoch):
r, c = 10, 10
fig, axs = plt.subplots(r, c)
for i in range(c):
z_dict = get_z(c1_len * 10, sequential = True)
out_gen = Net_G(torch.cat([z_dict[k] for k in z_dict.keys()], dim = 1))
for j in range(r):
idx = i * 10 + j + 1
axs[j,i].imshow(np.round(out_gen[idx - 1, 0].cpu().data.numpy() * 255), cmap = 'gray')
axs[j,i].axis('off')
fig.savefig("output/mnist_%02d.png" % epoch)
plt.close()
bar = ProgressBar(EPOCHS, len(train_loader), "D Loss:%.3f;G Loss:%.3f;Q Loss:%.3f")
for epoch in range(EPOCHS):
for i, (data, targets) in enumerate(train_loader):
ones = Variable(torch.ones(data.size()[0], 1)).cuda() if GPU_NUMS > 1 else Variable(torch.ones(data.size()[0], 1))
zeros = Variable(torch.zeros(data.size()[0], 1)).cuda() if GPU_NUMS > 1 else Variable(torch.zeros(data.size()[0], 1))
z_dict = get_z(data.size()[0])
z = torch.cat([z_dict[k] for k in z_dict.keys()], dim = 1)
data = Variable(data.float().cuda(async = True) if GPU_NUMS > 1 else data.float()) / 255
targets = Variable(targets.float().cuda(async = True) if GPU_NUMS > 1 else targets.float())
# Forward pass on real MNIST
out_dis, hid = Net_D(data)
c1 = LogSoftmax()(Q_cat(hid))
loss_dis = mse(out_dis, ones) - torch.sum(targets * c1) / (torch.sum(targets) + 1e-3) # Loss for real MNIST
train_datagen = SegDataGenerator(zoom_range=[0.5, 2.0],
zoom_maintain_shape=True,
crop_mode='random',
crop_size=(cfg.IMAGE_SIZE, cfg.IMAGE_SIZE),
rotation_range=0,
shear_range=0,
horizontal_flip=True,
channel_shift_range=20,
fill_mode='constant',
label_cval=cfg.LABEL_CVAL)
val_datagen = SegDataGenerator()
steps_per_epoch = int(
np.ceil(get_file_len(cfg.TRAIN_FILE_PATH) / float(cfg.BATCH_SIZE)))
probar = ProgressBar()
model.fit_generator(generator=train_datagen.flow_from_directory(
file_path=cfg.TRAIN_FILE_PATH,
data_dir=cfg.DATA_DIR,
data_suffix=".jpg",
label_dir=cfg.LABEL_DIR,
label_suffix=".png",
classes=cfg.NUM_CLASS,
target_size=(cfg.IMAGE_SIZE, cfg.IMAGE_SIZE),
color_mode='rgb',
batch_size=cfg.BATCH_SIZE,
shuffle=True,
loss_shape=None,
ignore_label=255),
steps_per_epoch=steps_per_epoch,
epochs=cfg.EPOCH_NUM,
x = x.clamp(0, 1)
x = x.view(x.size(0), 1, 28, 28)
return x
EPOCH = 100
BATCH_SIZE = 128
learning_rate = 1e-3
img_transform = transforms.Compose([
transforms.ToTensor()
# transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))
])
train_data = MNISTDataSet(train=True, transform=torchvision.transforms.ToTensor())
train_loader = DataLoader(train_data, batch_size=BATCH_SIZE, shuffle=True)
proBar = ProgressBar(EPOCH, len(train_loader), "loss:%.3f")
class VAE(nn.Module):
def __init__(self):
super(VAE, self).__init__()
self.fc1 = nn.Linear(784, 400)
self.fc21 = nn.Linear(400, 20)
self.fc22 = nn.Linear(400, 20)
self.fc3 = nn.Linear(20, 400)
self.fc4 = nn.Linear(400, 784)
def encode(self, x):
h1 = F.relu(self.fc1(x))
return self.fc21(h1), self.fc22(h1)
def forward(self, x):
x = leaky_relu(self.map1(x), 0.1)
x = leaky_relu(self.map2(x), 0.1)
return sigmoid(self.map3(x))
generator = SimpleMLP(input_size=z_dim, hidden_size=50, output_size=DIMENSION)
discriminator = SimpleMLP(input_size=DIMENSION, hidden_size=100, output_size=1)
if GPU_NUMS > 0:
generator.cuda()
discriminator.cuda()
criterion = BCELoss()
d_optimizer = Adadelta(discriminator.parameters(), lr=1)
g_optimizer = Adadelta(generator.parameters(), lr=1)
progBar = ProgressBar(1, iterations,
"D Loss:(real/fake) %.3f/%.3f,G Loss:%.3f")
for train_iter in range(1, iterations + 1):
for d_index in range(3):
# 1. Train D on real+fake
discriminator.zero_grad()
# 1A: Train D on real
real_samples = sample_2d(lut_2d, bs)
d_real_data = Variable(torch.Tensor(real_samples))
if GPU_NUMS > 0:
d_real_data = d_real_data.cuda()
d_real_decision = discriminator(d_real_data)
labels = Variable(torch.ones(bs))
if GPU_NUMS > 0:
labels = labels.cuda()
d_real_loss = criterion(d_real_decision, labels) # ones = true
gan = KModels.Model(inputs=ganInput, outputs=ganOutput)
if GPU_NUMS > 1:
model = multi_gpu_model(gan, GPU_NUMS)
# gan = kutils.multi_gpu_model(gan, 2)
gan.compile(loss='binary_crossentropy',
optimizer=adam,
metrics=['accuracy'])
dLosses = []
gLosses = []
batchCount = X_train.shape[0] // batchSize
print('Epochs:', epochs)
print('Batch size:', batchSize)
print('Batches per epoch:', batchCount)
progBar = ProgressBar(epochs, batchCount,
"D Loss:%.3f,D Acc:%.3f;G Loss:%.3f,G Acc:%.3f")
samples_image = []
for e in range(1, (epochs + 1)):
# Get a random set of input noise and images
for _ in range(batchCount):
noise = np.random.normal(0, 1, size=[batchSize, randomDim])
imageBatch = X_train[np.random.randint(0,
X_train.shape[0],
size=batchSize)]
imageBatch = np.reshape(imageBatch,
newshape=(batchSize, 28, 28, 1))
# Generate fake MNIST images
generatedImages = generator.predict(noise)
# 准备数据
json = MODEL_LIST["name" == MODEL]
train_data = Cifar10DataSet(train=True, transform=json["transform"])
train_loader = DataLoader(dataset=train_data,
batch_size=BATCH_SIZE,
shuffle=True)
# 准备网络
model = json["model"](json["pretrained"])
model = torch.nn.DataParallel(model).cuda()
optimizer = Adam(model.parameters(), lr=LR)
loss_func = CrossEntropyLoss().cuda()
# 训练数据
proBar = ProgressBar(EPOCH, len(train_loader), "loss:%.3f,acc:%.3f")
for epoch in range(EPOCH):
for step, (x, y) in enumerate(train_loader):
data = Variable(x)
label = Variable(torch.squeeze(y, dim=1).type(torch.LongTensor))
output = model(data)
loss = loss_func(output, label)
loss.backward()
optimizer.step()
prediction = torch.max(softmax(output), 1)[1]
pred_label = prediction.data.numpy().squeeze()
target_y = label.data.numpy()
accuracy = sum(pred_label == target_y) / len(target_y)
proBar.show(loss.data[0], accuracy)
dloss = 0
aloss = 0
x_train = imageList
y_train = labelList
x_train = (x_train.reshape((x_train.shape[0], ) +
(config.IMAGE_SIZE, config.IMAGE_SIZE,
config.IMAGE_CHANNEL)).astype('float32')) / 255
batchCount = x_train.shape[0] // batchSize
print('Epochs:', epochs)
print('Batch size:', batchSize)
print('Batches per epoch:', batchCount)
progBar = ProgressBar(epochs, batchCount, "D Loss:%.3f;G Loss:%.3f")
samples_image = []
start = 0
for epoch in range(1, (epochs + 1)):
for _ in range(batchCount):
noise = np.random.normal(size=(batchSize, 100))
generatedImages = generator.predict(noise)
imageBatch = x_train[np.random.randint(0,
x_train.shape[0],
size=batchSize)]
combined_images = np.concatenate([generatedImages, imageBatch])
labels = np.concatenate(
'GAN 2D Example Visualization of {}'.format(input_path))
generator = build_generator()
discriminator = build_discriminator()
discriminator.trainable = False
ganInput = Input(shape=(z_dim, ))
generator = build_generator()
x = generator(ganInput)
ganOutput = discriminator(x)
gan = Model(inputs=ganInput, outputs=ganOutput)
if GPU_NUMS > 1:
gan = multi_gpu_model(gan, GPU_NUMS)
gan.compile(loss='binary_crossentropy',
optimizer=RMSprop(lr=0.0008, clipvalue=1.0, decay=1e-8))
progBar = ProgressBar(1, iterations, "D Loss:%.3f,G Loss:%.3f")
for epoch_iter in range(1, iterations + 1):
for index in range(20):
real_samples = sample_2d(lut_2d, bs)
# print(real_samples.shape)
noise = np.random.normal(-1, 1, size=[bs, z_dim])
generateImage = generator.predict(noise)
discriminator.trainable = True
yDis = np.zeros(2 * bs)
yDis[:bs] = 1
d_loss = discriminator.train_on_batch(
np.concatenate((real_samples, generateImage)), yDis)
for index in range(1):
def train(self, epochs, batch_size=128, save_interval=50):
# Load the dataset
(X_train, _), (_, _) = read_mnist()
# Rescale -1 to 1
X_train = (X_train.astype(np.float32) - 127.5) / 127.5
X_train = np.expand_dims(X_train, axis=3)
half_batch = int(batch_size / 2)
proBar = ProgressBar(1, epochs,
"d loss:%.3f,d acc:%.3f;g loss:%.3f,g acc:%.3f")
for epoch in range(epochs):
# ---------------------
# Train Discriminator
# ---------------------
# Select a random half batch of images
idx = np.random.randint(0, X_train.shape[0], half_batch)
imgs = X_train[idx]
# Generate a half batch of embedded images
latent_fake = self.encoder.predict(imgs)
latent_real = np.random.normal(size=(half_batch, self.encoded_dim))
valid = np.ones((half_batch, 1))
fake = np.zeros((half_batch, 1))
# Train the discriminator
d_loss_real = self.discriminator.train_on_batch(latent_real, valid)
d_loss_fake = self.discriminator.train_on_batch(latent_fake, fake)
d_loss = 0.5 * np.add(d_loss_real, d_loss_fake)
# ---------------------
# Train Generator
# ---------------------
# Select a random half batch of images
idx = np.random.randint(0, X_train.shape[0], batch_size)
imgs = X_train[idx]
# Generator wants the discriminator to label the generated representations as valid
valid_y = np.ones((batch_size, 1))
# Train the generator
g_loss = self.adversarial_autoencoder.train_on_batch(
imgs, [imgs, valid_y])
# Plot the progress
# print ("%d [D loss: %f, acc: %.2f%%] [G loss: %f, mse: %f]" % (epoch, d_loss[0], 100*d_loss[1], g_loss[0], g_loss[1]))
proBar.show(d_loss[0], d_loss[1], g_loss[0], g_loss[1])
# If at save interval => save generated image samples
if epoch % save_interval == 0:
# Select a random half batch of images
idx = np.random.randint(0, X_train.shape[0], 25)
imgs = X_train[idx]
self.save_imgs(epoch, imgs)
Scale(IMG_SIZE),
ToTensor(),
Normalize(mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5))
])
train_loader = torch.utils.data.DataLoader(
# MNIST('data', train=True, download=True, transform=transform),
MNISTDataSet('../ganData/mnist.npz', train=True, transform=transform),
batch_size=BATCH_SIZE,
shuffle=True)
'''
开始训练
'''
BCE_loss = BCELoss()
G_optimizer = Adam(Net_G.parameters(), lr=LR, betas=(0.5, 0.999))
D_optimizer = Adam(Net_D.parameters(), lr=LR, betas=(0.5, 0.999))
bar = ProgressBar(EPOCHS, len(train_loader), "D Loss:%.3f; G Loss:%.3f")
# label preprocess
onehot = torch.zeros(10, 10)
onehot = onehot.scatter_(
1,
torch.LongTensor([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]).view(10, 1),
1).view(10, 10, 1, 1)
fill = torch.zeros([10, 10, IMG_SIZE, IMG_SIZE])
for i in range(10):
fill[i, i, :, :] = 1
bar = ProgressBar(EPOCHS, len(train_loader), "D Loss:%.3f; G Loss:%.3f")
for epoch in range(EPOCHS):
# learning rate decay
nn.ReLU(True),
nn.ConvTranspose2d(8, 1, 2, stride=2, padding=1), # b, 1, 28, 28
nn.Tanh())
def forward(self, x):
x = self.encoder(x)
x = self.decoder(x)
return x
model = autoencoder().cuda() if torch.cuda.is_available() else autoencoder()
criterion = nn.MSELoss()
optimizer = torch.optim.Adam(model.parameters(),
lr=learning_rate,
weight_decay=1e-5)
proBar = ProgressBar(num_epochs, len(dataloader), "loss:%.3f")
for epoch in range(num_epochs):
for data in dataloader:
img, _ = data
img = Variable(img).cuda() if torch.cuda.is_available() else Variable(
img)
# ===================forward=====================
output = model(img)
loss = criterion(output, img)
# ===================backward====================
optimizer.zero_grad()
loss.backward()
optimizer.step()
proBar.show(loss.data[0])
if epoch % 10 == 0:
test_input, test_target = test_data_loader.__iter__().__next__()
real_a = torch.FloatTensor(BATCH_SIZE, IMAGE_CHANNEL, IMAGE_SIZE, IMAGE_SIZE)
real_b = torch.FloatTensor(BATCH_SIZE, OUTPUT_CHANNEL, IMAGE_SIZE, IMAGE_SIZE)
if GPU_NUMS > 1:
Net_G = Net_G.cuda()
Net_D = Net_D.cuda()
lossGAN = lossGAN.cuda()
lossL1 = lossL1.cuda()
lossMSE = lossMSE.cuda()
real_a = Variable(real_a.cuda() if GPU_NUMS > 1 else real_a)
real_b = Variable(real_b.cuda() if GPU_NUMS > 1 else real_b)
bar = ProgressBar(EPOCHS, len(train_data_loader), "D loss:%.3f;G loss:%.3f")
for epoch in range(EPOCHS):
for iteration, batch in enumerate(train_data_loader, 1):
real_a_cpu, real_b_cpu = batch[0], batch[1]
real_a.data.resize_(real_a_cpu.size()).copy_(real_a_cpu)
real_b.data.resize_(real_b_cpu.size()).copy_(real_b_cpu)
fake_b = Net_G(real_a)
optimizer_D.zero_grad()
# train with fake
fake_ab = torch.cat((real_a, fake_b), 1)
pred_fake = Net_D.forward(fake_ab.detach())
loss_d_fake = lossGAN(pred_fake, False)
# train with real
Discriminator.compile(loss='binary_crossentropy',
optimizer=optimizer,
metrics=['accuracy'])
noise_temp = Input(shape=(NOISE_DIM, ))
label_temp = Input(shape=(1, ))
img = Generator([noise_temp, label_temp])
Discriminator.trainable = False
valid = Discriminator([img, label_temp])
Gan = Model([noise_temp, label_temp], valid)
Gan.compile(loss='binary_crossentropy', optimizer=optimizer)
'''
开始训练
'''
half_batch = int(BATCH_SIZE / 2)
proBar = ProgressBar(1, EPOCH, "D loss: %f, acc.: %.2f%%; G loss: %f")
for epoch in range(1, EPOCH + 1):
idx = np.random.randint(0, x_train.shape[0], size=half_batch)
image, label = x_train[idx], y_train[idx]
noise = np.random.normal(0, 1, (half_batch, 100))
generate_image = Generator.predict([noise, label])
valid = np.ones((half_batch, 1))
fake = np.zeros((half_batch, 1))
d_loss_real = Discriminator.train_on_batch([image, label], valid)
d_loss_fake = Discriminator.train_on_batch([generate_image, label], fake)
d_loss = 0.5 * np.add(d_loss_real, d_loss_fake)
noise = np.random.normal(0, 1, (BATCH_SIZE, 100))
