def train_step(lr, hr, generator, discriminator, content): with tf.GradientTape() as gen_tape, tf.GradientTape() as disc_tape: ## re-scale ## lr: 0 ~ 1 ## hr: -1 ~ 1 lr = tf.cast(lr, tf.float32) hr = tf.cast(hr, tf.float32) lr = lr / 255 hr = hr / 127.5 - 1 sr = generator(lr, training=True) sr_output = discriminator(sr, training=True) hr_output = discriminator(hr, training=True) disc_loss = discriminator_loss(sr_output, hr_output) mse_loss = mse_based_loss(sr, hr) gen_loss = generator_loss(sr_output) cont_loss = content_loss(content, sr, hr) perceptual_loss = mse_loss + cont_loss + 1e-3 * gen_loss gradients_of_generator = gen_tape.gradient( perceptual_loss, generator.trainable_variables) gradients_of_discriminator = disc_tape.gradient( disc_loss, discriminator.trainable_variables) generator_optimizer.apply_gradients( zip(gradients_of_generator, generator.trainable_variables)) discriminator_optimizer.apply_gradients( zip(gradients_of_discriminator, discriminator.trainable_variables)) return perceptual_loss, disc_loss
def dis_step(input_image, target): with tf.GradientTape() as disc_tape: gen_output = generator(input_image, training=True) disc_real_output = discriminator([input_image, target], training=True) disc_generated_output = discriminator([input_image, gen_output], training=True) disc_loss,real_loss,generated_loss = discriminator_loss(disc_real_output, disc_generated_output) discriminator_gradients = disc_tape.gradient(disc_loss, discriminator.trainable_variables) discriminator_optimizer.apply_gradients(zip(discriminator_gradients, discriminator.trainable_variables)) return disc_loss,real_loss,generated_loss
def train_step(molecules_A, molecules_X) : """ First generates molecules with the generator, then pass a batch of data and the generated molecules through the discriminator, then applies backpropagation """ z = np.random.randn(molecules_A.shape[0], 32) with tf.GradientTape() as gen_tape, tf.GradientTape() as disc_tape : generated_A, generated_X = generator(z) real_logits = discriminator(molecules_A, molecules_X) fake_logits = discriminator(generated_A[0], generated_X[0]) # backpropagation # gradient penalty : WGAN, discriminator loss with gen_tape.stop_recording() : with disc_tape.stop_recording() : # cf. equation (3) in the paper : penalty on the gradient of the discriminator wrt a linear combination of real and generated data epsilon_adj = tf.random.uniform(tf.shape(molecules_A), 0.0, 1.0, dtype=molecules_A.dtype) epsilon_features = tf.random.uniform(tf.shape(molecules_X), 0.0, 1.0, dtype=generated_X.dtype) with tf.GradientTape() as penalty_tape : m1 = epsilon_adj * molecules_A m2 = (1 - epsilon_adj)*generated_A[0] x_hat_adj = m1 + m2 x_hat_features = epsilon_features * molecules_X + (1 - epsilon_features) * generated_X[0] penalty_tape.watch([x_hat_adj, x_hat_features]) disc_penalty = discriminator(x_hat_adj, x_hat_features) # get the gradient, again eq (3) in the paper grad_adj = penalty_tape.gradient(disc_penalty, [x_hat_adj, x_hat_features]) disc_loss = loss.discriminator_loss(real_logits, fake_logits, grad_adj) gen_loss = loss.generator_loss(fake_logits) gradients_of_generator = gen_tape.gradient(gen_loss, generator.variables) gradients_of_discriminator = disc_tape.gradient(disc_loss, discriminator.variables) disciminator_optimizer.apply_gradients(zip(gradients_of_discriminator, discriminator.variables)) generator_optimizer.apply_gradients(zip(gradients_of_generator, generator.variables)) gen_train_loss(gen_loss) disc_train_loss(disc_loss) return gen_train_loss, disc_train_loss
def train_step(input_image, target,LAMBDA): with tf.GradientTape() as gen_tape, tf.GradientTape() as disc_tape: gen_output = generator(input_image, training=True) disc_real_output = discriminator([input_image, target], training=True) disc_generated_output = discriminator([input_image, gen_output], training=True) gen_total_loss, gen_gan_loss, gen_l1_loss = generator_loss(disc_generated_output, gen_output, target,LAMBDA) disc_loss,real_loss,generated_loss = discriminator_loss(disc_real_output, disc_generated_output) generator_gradients = gen_tape.gradient(gen_total_loss, generator.trainable_variables) discriminator_gradients = disc_tape.gradient(disc_loss, discriminator.trainable_variables) generator_optimizer.apply_gradients(zip(generator_gradients, generator.trainable_variables)) discriminator_optimizer.apply_gradients(zip(discriminator_gradients, discriminator.trainable_variables)) return gen_total_loss, gen_gan_loss, gen_l1_loss,disc_loss,real_loss,generated_loss
fake_tex = model_d(fake_img) # Update Discriminator network if iteration % opt.disc_freq == 0: # calculate gradient penalty if opt.wgan: rand = torch.rand(1).item() sample = rand * disc_img + (1 - rand) * fake_img gp_tex = model_d(sample) gradient = torch.autograd.grad(gp_tex.mean(), sample, create_graph=True)[0] grad_pen = 10 * (gradient.norm() - 1) ** 2 else: grad_pen = None # update discriminator model_d.zero_grad() d_tex_loss = loss.discriminator_loss(real_tex, fake_tex, wasserstein=opt.wgan, grad_penalties=grad_pen) d_tex_loss.backward(retain_graph=True) optimizer_d.step() # save data to tensorboard if opt.saving: writer.add_scalar('loss/d_tex_loss', d_tex_loss, iteration) if opt.wgan: writer.add_scalar('disc_score/gradient_penalty', grad_pen.mean().data.item(), iteration) # Update Generator network if iteration % opt.gen_freq == 0: # update discriminator model_g.zero_grad() if opt.generator == 'DSGAN': g_loss = g_loss_module(fake_tex, fake_img, input_img) elif opt.generator == 'DeResnet':
def main(args): os.makedirs(args.log_dir, exist_ok=True) # create models G_1 = Generator_lr(in_channels=3) G_2 = Generator_lr(in_channels=3) D_1 = Discriminator_lr(in_channels=3, in_h=16, in_w=16) SR = EDSR(n_colors=3) G_3 = Generator_sr(in_channels=3) D_2 = Discriminator_sr(in_channels=3, in_h=64, in_w=64) for model in [G_1, G_2, D_1, SR, G_3, D_2]: model.cuda() model.train() # tensorboard writer = SummaryWriter(log_dir=args.log_dir) # create optimizors optim = { 'G_1': torch.optim.Adam(params=filter(lambda p: p.requires_grad, G_1.parameters()), lr=args.lr * 5), 'G_2': torch.optim.Adam(params=filter(lambda p: p.requires_grad, G_2.parameters()), lr=args.lr * 5), 'D_1': torch.optim.Adam(params=filter(lambda p: p.requires_grad, D_1.parameters()), lr=args.lr), 'SR': torch.optim.Adam(params=filter(lambda p: p.requires_grad, SR.parameters()), lr=args.lr * 5), 'G_3': torch.optim.Adam(params=filter(lambda p: p.requires_grad, G_3.parameters()), lr=args.lr), 'D_2': torch.optim.Adam(params=filter(lambda p: p.requires_grad, D_2.parameters()), lr=args.lr) } for key in optim.keys(): optim[key].zero_grad() # get dataloader train_dataset = DIV2KDataset(root=args.data_path) trainloader = DataLoader(train_dataset, batch_size=args.batch_size, shuffle=True, num_workers=3) print('-' * 20) print('Start training') print('-' * 20) iter_index = 0 for epoch in range(args.epochs): G_1.train() SR.train() start = timeit.default_timer() for _, batch in enumerate(trainloader): iter_index += 1 image, label_hr, label_lr = batch image = image.cuda() label_hr = label_hr.cuda() label_lr = label_lr.cuda() '''loss for lr GAN''' '''update G_1 and G_2''' for key in optim.keys(): optim[key].zero_grad() # D loss for D_1 image_clean = G_1(image) loss_D1 = discriminator_loss(discriminator=D_1, fake=image_clean, real=label_lr) loss_D1.backward() optim['D_1'].step() # GD loss for G_1 loss_G1 = generator_discriminator_loss(generator=G_1, discriminator=D_1, input=image) loss_G1.backward() # cycle loss for G_1 and G_2 loss_cycle = 10 * cycle_loss(G_1, G_2, image) loss_cycle.backward() # idt loss for G_1 loss_idt = 5 * identity_loss(clean_image=label_lr, generator=G_1) loss_idt.backward() # tvloss for G_1 loss_tv = 0.5 * tvloss(input=image, generator=G_1) loss_tv.backward() # optimize G_1 and G_2 optim['G_1'].step() optim['G_2'].step() if iter_index % 100 == 0: print( 'iter {}: LR: loss_D1={}, loss_GD={}, loss_cycle={}, loss_idt={}, loss_tv={}' .format(iter_index, loss_D1.item(), loss_G1.item(), loss_cycle.item(), loss_idt.item(), loss_tv.item())) writer.add_scalar('LR/loss_D1', loss_D1.item(), iter_index // 100) writer.add_scalar('LR/loss_GD', loss_G1.item(), iter_index // 100) writer.add_scalar('LR/loss_cycle', loss_cycle.item(), iter_index // 100) writer.add_scalar('LR/loss_idt', loss_idt.item(), iter_index // 100) writer.add_scalar('LR/loss_tv', loss_tv.item(), iter_index // 100) writer.add_image('LR/origin', image[0], iter_index // 100) writer.add_image('LR/denoise', G_1(image)[0], iter_index // 100) '''loss for sr GAN''' '''update G_1, SR and G_3''' for key in optim.keys(): optim[key].zero_grad() image_clean = G_1(image).detach() # D loss for D_2 image_sr = SR(image_clean) loss_D2 = discriminator_loss(discriminator=D_2, fake=image_sr, real=label_hr) loss_D2.backward() optim['D_2'].step() # GD loss for SR loss_SR = generator_discriminator_loss(generator=SR, discriminator=D_2, input=image_clean) loss_SR.backward() # cycle loss for SR and G_3 loss_cycle = 10 * cycle_loss(SR, G_3, image_clean) loss_cycle.backward() # idt loss for SR loss_idt = 5 * identity_loss_sr( clean_image_lr=label_lr, clean_image_hr=label_hr, generator=SR) loss_idt.backward() # tvloss for SR loss_tv = 0.5 * tvloss(input=image_clean, generator=SR) loss_tv.backward() # optimize G_1, SR and G_3 optim['G_1'].step() optim['SR'].step() optim['G_3'].step() if iter_index % 100 == 0: print( ' SR: loss_D2={}, loss_SR={}, loss_cycle={}, loss_idt={}, loss_tv={}' .format(loss_D2.item(), loss_SR.item(), loss_cycle.item(), loss_idt.item(), loss_tv.item())) writer.add_scalar('SR/loss_D2', loss_D2.item(), iter_index // 100) writer.add_scalar('SR/loss_SR', loss_SR.item(), iter_index // 100) writer.add_scalar('SR/loss_cycle', loss_cycle.item(), iter_index // 100) writer.add_scalar('SR/loss_idt', loss_idt.item(), iter_index // 100) writer.add_scalar('SR/loss_tv', loss_tv.item(), iter_index // 100) writer.add_image('SR/origin', image[0], iter_index // 100) writer.add_image('SR/clean_image', G_1(image)[0], iter_index // 100) writer.add_image('SR/SR', SR(G_1(image))[0], iter_index // 100) writer.flush() end = timeit.default_timer() print('epoch {}, using {} seconds'.format(epoch, end - start)) G_1.eval() SR.eval() image = Image.open('/data/data/DIV2K/unsupervised/lr/0001x4d.png') sr_image = resolv_sr(G_1, SR, image) # image_tensor = torchvision.transforms.functional.to_tensor(image).unsqueeze(0).cuda() # sr_image_tensor = SR(G_1(image_tensor).detach()) # sr_image = torchvision.transforms.functional.to_pil_image(sr_image_tensor[0].cpu()) sr_image.save( os.path.join(args.log_dir, '0001x4d_sr_{}.png'.format(str(epoch)))) torch.save(G_1.state_dict(), os.path.join(args.log_dir, 'ep-' + str(epoch) + '_G_1.pkl')) torch.save(G_2.state_dict(), os.path.join(args.log_dir, 'ep-' + str(epoch) + '_G_2.pkl')) torch.save(D_1.state_dict(), os.path.join(args.log_dir, 'ep-' + str(epoch) + '_D_1.pkl')) torch.save(SR.state_dict(), os.path.join(args.log_dir, 'ep-' + str(epoch) + '_SR.pkl')) torch.save(G_3.state_dict(), os.path.join(args.log_dir, 'ep-' + str(epoch) + '_G_3.pkl')) torch.save(D_2.state_dict(), os.path.join(args.log_dir, 'ep-' + str(epoch) + '_D_2.pkl')) writer.close() print('Training done.') torch.save(G_1.state_dict(), os.path.join(args.log_dir, 'final_weights_G_1.pkl')) torch.save(G_2.state_dict(), os.path.join(args.log_dir, 'final_weights_G_2.pkl')) torch.save(D_1.state_dict(), os.path.join(args.log_dir, 'final_weights_D_1.pkl')) torch.save(SR.state_dict(), os.path.join(args.log_dir, 'final_weights_SR.pkl')) torch.save(G_3.state_dict(), os.path.join(args.log_dir, 'final_weights_G_3.pkl')) torch.save(D_2.state_dict(), os.path.join(args.log_dir, 'final_weights_D_2.pkl')) image = Image.open('/data/data/DIV2K/unsupervised/lr/0001x4d.png') image.save(os.path.join(args.log_dir, '0001x4d.png')) sr_image = resolv_sr(G_1, SR, image) # image_tensor = torchvision.transforms.functional.to_tensor(image).unsqueeze(0).cuda() # sr_image_tensor = SR(G_1(image_tensor)) # sr_image = torchvision.transforms.functional.to_pil_image(sr_image_tensor[0].cpu()) sr_image.save(os.path.join(args.log_dir, '0001x4d_sr.png'))
def trainstep(real_human, real_anime, big_anime): with tf.GradientTape(persistent=True) as tape: fake_anime = generator_to_anime(real_human, training=True) cycled_human = generator_to_human(fake_anime, training=True) fake_human = generator_to_human(real_anime, training=True) cycled_anime = generator_to_anime(fake_human, training=True) # same_human and same_anime are used for identity loss. same_human = generator_to_human(real_human, training=True) same_anime = generator_to_anime(real_anime, training=True) disc_real_human = discriminator_human(real_human, training=True) disc_real_anime = discriminator_anime(real_anime, training=True) disc_fake_human = discriminator_human(fake_human, training=True) disc_fake_anime = discriminator_anime(fake_anime, training=True) # calculate the loss gen_anime_loss = generator_loss(disc_fake_anime) gen_human_loss = generator_loss(disc_fake_human) total_cycle_loss = cycle_loss(real_human, cycled_human) + cycle_loss( real_anime, cycled_anime) # Total generator loss = adversarial loss + cycle loss total_gen_anime_loss = (gen_anime_loss + total_cycle_loss + identity_loss(real_anime, same_anime)) total_gen_anime_loss = generator_to_anime_optimizer.get_scaled_loss( total_gen_anime_loss) total_gen_human_loss = (gen_human_loss + total_cycle_loss + identity_loss(real_human, same_human)) total_gen_human_loss = generator_to_human_optimizer.get_scaled_loss( total_gen_human_loss) disc_human_loss = discriminator_loss(disc_real_human, disc_fake_human) disc_human_loss = discriminator_human_optimizer.get_scaled_loss( disc_human_loss) disc_anime_loss = discriminator_loss(disc_real_anime, disc_fake_anime) disc_anime_loss = discriminator_anime_optimizer.get_scaled_loss( disc_anime_loss) # My part fake_anime_upscale = generator_anime_upscale(fake_anime) cycle_anime_upscale = generator_anime_upscale(real_anime) same_anime_upscale = generator_anime_upscale(same_anime) disc_fake_upscale = discriminator_anime_upscale(fake_anime_upscale) disc_cycle_upscale = discriminator_anime_upscale( cycle_anime_upscale) disc_same_upscale = discriminator_anime_upscale(same_anime_upscale) disc_real_big = discriminator_anime_upscale(big_anime) gen_upscale_loss = ( generator_loss(disc_fake_upscale) * 3 + generator_loss(disc_cycle_upscale) + generator_loss(disc_same_upscale) # + mse_loss(big_anime, cycle_anime_upscale) + identity_loss(big_anime, cycle_anime_upscale) * 0.5 + identity_loss(big_anime, same_anime_upscale) * 0.5) gen_upscale_loss = generator_anime_upscale_optimizer.get_scaled_loss( gen_upscale_loss) disc_upscale_loss = discriminator_upscale_loss( disc_real_big, disc_fake_upscale, disc_cycle_upscale, disc_same_upscale) disc_upscale_loss = discriminator_anime_upscale_optimizer.get_scaled_loss( disc_upscale_loss) # Calculate the gradients for generator and discriminator generator_to_anime_gradients = tape.gradient( total_gen_anime_loss, generator_to_anime.trainable_variables) generator_to_human_gradients = tape.gradient( total_gen_human_loss, generator_to_human.trainable_variables) discriminator_human_gradients = tape.gradient( disc_human_loss, discriminator_human.trainable_variables) discriminator_anime_gradients = tape.gradient( disc_anime_loss, discriminator_anime.trainable_variables) generator_upscale_gradients = tape.gradient( gen_upscale_loss, generator_anime_upscale.trainable_variables) discriminator_upscale_gradients = tape.gradient( disc_upscale_loss, discriminator_anime_upscale.trainable_variables) # Apply the gradients to the optimizer generator_to_anime_gradients = generator_to_anime_optimizer.get_unscaled_gradients( generator_to_anime_gradients) generator_to_anime_optimizer.apply_gradients( zip(generator_to_anime_gradients, generator_to_anime.trainable_variables)) generator_to_human_gradients = generator_to_human_optimizer.get_unscaled_gradients( generator_to_human_gradients) generator_to_human_optimizer.apply_gradients( zip(generator_to_human_gradients, generator_to_human.trainable_variables)) discriminator_human_gradients = discriminator_human_optimizer.get_unscaled_gradients( discriminator_human_gradients) discriminator_human_optimizer.apply_gradients( zip(discriminator_human_gradients, discriminator_human.trainable_variables)) discriminator_anime_gradients = discriminator_anime_optimizer.get_unscaled_gradients( discriminator_anime_gradients) discriminator_anime_optimizer.apply_gradients( zip(discriminator_anime_gradients, discriminator_anime.trainable_variables)) generator_upscale_gradients = generator_anime_upscale_optimizer.get_unscaled_gradients( generator_upscale_gradients) generator_anime_upscale_optimizer.apply_gradients( zip(generator_upscale_gradients, generator_anime_upscale.trainable_variables)) discriminator_upscale_gradients = discriminator_anime_upscale_optimizer.get_unscaled_gradients( discriminator_upscale_gradients) discriminator_anime_upscale_optimizer.apply_gradients( zip( discriminator_upscale_gradients, discriminator_anime_upscale.trainable_variables, )) return ( real_human, real_anime, fake_anime, cycled_human, fake_human, cycled_anime, same_human, same_anime, fake_anime_upscale, same_anime_upscale, gen_anime_loss, gen_human_loss, disc_human_loss, disc_anime_loss, total_gen_anime_loss, total_gen_human_loss, gen_upscale_loss, disc_upscale_loss, )
def trainstep(real_human, real_anime): with tf.GradientTape(persistent=True) as tape: fake_anime = generator_to_anime(real_human, training=True) cycled_human = generator_to_human(fake_anime, training=True) fake_human = generator_to_human(real_anime, training=True) cycled_anime = generator_to_anime(fake_human, training=True) # same_human and same_anime are used for identity loss. same_human = generator_to_human(real_human, training=True) same_anime = generator_to_anime(real_anime, training=True) disc_real_human = discriminator_x(real_human, training=True) disc_real_anime = discriminator_y(real_anime, training=True) disc_fake_human = discriminator_x(fake_human, training=True) disc_fake_anime = discriminator_y(fake_anime, training=True) # calculate the loss gen_anime_loss = generator_loss(disc_fake_anime) gen_human_loss = generator_loss(disc_fake_human) total_cycle_loss = cycle_loss(real_human, cycled_human) + cycle_loss( real_anime, cycled_anime) # Total generator loss = adversarial loss + cycle loss total_gen_anime_loss = gen_anime_loss + total_cycle_loss + identity_loss( real_anime, same_anime) total_gen_human_loss = gen_human_loss + total_cycle_loss + identity_loss( real_human, same_human) disc_x_loss = discriminator_loss(disc_real_human, disc_fake_human) disc_y_loss = discriminator_loss(disc_real_anime, disc_fake_anime) # Calculate the gradients for generator and discriminator generator_to_anime_gradients = tape.gradient( total_gen_anime_loss, generator_to_anime.trainable_variables) generator_to_human_gradients = tape.gradient( total_gen_human_loss, generator_to_human.trainable_variables) discriminator_x_gradients = tape.gradient( disc_x_loss, discriminator_x.trainable_variables) discriminator_y_gradients = tape.gradient( disc_y_loss, discriminator_y.trainable_variables) # Apply the gradients to the optimizer generator_to_anime_optimizer.apply_gradients( zip(generator_to_anime_gradients, generator_to_anime.trainable_variables)) generator_to_human_optimizer.apply_gradients( zip(generator_to_human_gradients, generator_to_human.trainable_variables)) discriminator_x_optimizer.apply_gradients( zip(discriminator_x_gradients, discriminator_x.trainable_variables)) discriminator_y_optimizer.apply_gradients( zip(discriminator_y_gradients, discriminator_y.trainable_variables)) return fake_anime, cycled_human, fake_human, cycled_anime , same_human , same_anime, \ gen_anime_loss, gen_human_loss, disc_x_loss, disc_y_loss, total_gen_anime_loss, total_gen_human_loss
def trainstep(real_human, real_anime, big_anime): with tf.GradientTape(persistent=True) as tape: ones = tf.ones_like(real_human) neg_ones = tf.ones_like(real_human) * -1 def get_domain_anime(img): return tf.concat([img, ones], 3) def get_domain_human(img): return tf.concat([img, neg_ones], 3) fake_anime = generator(get_domain_anime(real_human), training=True) cycled_human = generator(get_domain_human(fake_anime), training=True) fake_human = generator(get_domain_human(real_anime), training=True) cycled_anime = generator(get_domain_anime(fake_human), training=True) # same_human and same_anime are used for identity loss. same_human = generator(get_domain_human(real_human), training=True) same_anime = generator(get_domain_anime(real_anime), training=True) disc_real_human, label_real_human = discriminator(real_human, training=True) disc_real_anime, label_real_anime = discriminator(real_anime, training=True) disc_fake_human, label_fake_human = discriminator(fake_human, training=True) disc_fake_anime, label_fake_anime = discriminator(fake_anime, training=True) _, label_cycled_human = discriminator(cycled_human, training=True) _, label_cycled_anime = discriminator(cycled_anime, training=True) _, label_same_human = discriminator(same_human, training=True) _, label_same_anime = discriminator(same_anime, training=True) # calculate the loss gen_anime_loss = generator_loss(disc_fake_anime) gen_human_loss = generator_loss(disc_fake_human) total_cycle_loss = cycle_loss(real_human, cycled_human) + cycle_loss( real_anime, cycled_anime ) gen_class_loss = ( discriminator_loss(label_fake_human, label_fake_anime) + discriminator_loss(label_cycled_human, label_cycled_anime) + discriminator_loss(label_same_human, label_same_anime) ) # Total generator loss = adversarial loss + cycle loss total_gen_loss = ( gen_anime_loss + gen_human_loss + gen_class_loss + total_cycle_loss * 0.1 + identity_loss(real_anime, same_anime) + identity_loss(real_human, same_human) ) tf.print("gen_anime_loss",gen_anime_loss) tf.print("gen_human_loss",gen_human_loss) tf.print("gen_class_loss",gen_class_loss) tf.print("total_cycle_loss",total_cycle_loss) tf.print("identity_loss(real_anime, same_anime)",identity_loss(real_anime, same_anime)) tf.print("identity_loss(real_human, same_human)",identity_loss(real_human, same_human)) scaled_total_gen_anime_loss = generator_optimizer.get_scaled_loss( total_gen_loss ) disc_human_loss = discriminator_loss(disc_real_human, disc_fake_human) disc_anime_loss = discriminator_loss(disc_real_anime, disc_fake_anime) # disc_gp_anime = gradient_penalty_star(partial(discriminator, training=True), real_anime,fake_anime ) # disc_gp_human = gradient_penalty_star(partial(discriminator, training=True), real_human,fake_human ) disc_loss = disc_human_loss + disc_anime_loss + discriminator_loss(label_real_human,label_real_anime) # +disc_gp_anime+disc_gp_human scaled_disc_loss = discriminator_optimizer.get_scaled_loss( disc_loss ) # Calculate the gradients for generator and discriminator generator_gradients =generator_optimizer.get_unscaled_gradients( tape.gradient( scaled_total_gen_anime_loss, generator.trainable_variables )) discriminator_gradients = discriminator_optimizer.get_unscaled_gradients( tape.gradient( scaled_disc_loss, discriminator.trainable_variables )) generator_optimizer.apply_gradients( zip(generator_gradients, generator.trainable_variables) ) discriminator_optimizer.apply_gradients( zip(discriminator_gradients, discriminator.trainable_variables) ) with tf.GradientTape(persistent=True) as tape: real_anime_up = up_G(real_anime) fake_anime_up = up_G(fake_anime) dis_fake_anime_up = up_D(fake_anime_up) dis_real_anime_up = up_D(real_anime_up) dis_ori_anime = up_D(big_anime) gen_up_loss = generator_loss(fake_anime_up) + generator_loss(dis_real_anime_up)*0.1 dis_up_loss = discriminator_loss(dis_ori_anime,dis_fake_anime_up)+discriminator_loss(dis_ori_anime,dis_real_anime_up)*0.1 scaled_gen_up_loss = up_G_optim.get_scaled_loss(gen_up_loss) scaled_disc_loss = up_D_optim.get_scaled_loss(dis_up_loss) up_G_gradients =up_G_optim.get_unscaled_gradients( tape.gradient( scaled_gen_up_loss, up_G.trainable_variables )) up_D_gradients = up_D_optim.get_unscaled_gradients( tape.gradient( scaled_disc_loss, up_D.trainable_variables )) up_G_optim.apply_gradients( zip(up_G_gradients, up_G.trainable_variables) ) up_D_optim.apply_gradients( zip(up_D_gradients, up_D.trainable_variables) ) return ( real_human, real_anime, fake_anime, cycled_human, fake_human, cycled_anime, same_human, same_anime, fake_anime_up, real_anime_up, gen_anime_loss, gen_human_loss, disc_human_loss, disc_anime_loss, gen_up_loss, dis_up_loss )
images[i] = Variable(images[i]).cuda() text_len = Variable(text_len).cuda() #print(text.shape, text_len) hidden = text_encoder.init_hidden(2) words_embs, sent_embs = text_encoder(text, text_len, hidden) sent_embs = sent_embs.detach() real_labels = real_labels.detach() fake_labels = fake_labels.detach() fake_images = g_net(noise, sent_embs) for i in range(len(d_nets)): d_nets[i].zero_grad() errD = discriminator_loss(d_nets[i], images[i].detach(), fake_images[i].detach(), sent_embs, real_labels.detach(), fake_labels.detach()) errD.backward() optimizersD[i].step() total_error_d += errD g_net.zero_grad() errG_total = generator_loss(d_nets, fake_images, sent_embs, real_labels) errG_total.backward() optimizerG.step() total_error_g += errG_total print('total error: g: ', total_error_g, ' d: ', total_error_d) save_single_image(fake_images[2], 'fake' + str(epoch) + '.png') torch.save(g_net, 'G_NET.pth') for i in range(len(d_nets)):
real_logits = discriminator(images, training=True) fake_logits = discriminator(generated_images, training=True) real_logits_rot = discriminator(images_rot, training=True, predict_rotation=True) fake_logits_rot = discriminator(generated_images_rot, training=True, predict_rotation=True) if second_unpaired is True: generated_images_2 = generator(noise_2, training=True) fake_logits_2 = discriminator(generated_images_2, training=True) disc_loss_2 = discriminator_loss(real_logits, fake_logits_2, rotation_n, real_logits_rot) # [] CHECK gen_loss = generator_loss(fake_logits, rotation_n, fake_logits_rot) disc_loss = discriminator_loss(real_logits, fake_logits, rotation_n, real_logits_rot) gradients_of_generator = gen_tape.gradient(gen_loss, generator.variables) gradients_of_discriminator = disc_tape.gradient( disc_loss, discriminator.variables) # gradients_of_discriminator_rot = disc_rot_tape.gradient(disc_loss_rot, discriminator.variables) generator_optimizer.apply_gradients( zip(gradients_of_generator, generator.variables)) discriminator_optimizer.apply_gradients(