def optimize(args): """ Gatys et al. CVPR 2017 ref: Image Style Transfer Using Convolutional Neural Networks """ if args.cuda: ctx = mx.gpu(0) else: ctx = mx.cpu(0) # load the content and style target content_image = utils.tensor_load_rgbimage(args.content_image, ctx, size=args.content_size, keep_asp=True) content_image = utils.subtract_imagenet_mean_preprocess_batch( content_image) style_image = utils.tensor_load_rgbimage(args.style_image, ctx, size=args.style_size) style_image = utils.subtract_imagenet_mean_preprocess_batch(style_image) # load the pre-trained vgg-16 and extract features vgg = net.Vgg16() utils.init_vgg_params(vgg, 'models', ctx=ctx) # content feature f_xc_c = vgg(content_image)[1] # style feature features_style = vgg(style_image) gram_style = [net.gram_matrix(y) for y in features_style] # output output = Parameter('output', shape=content_image.shape) output.initialize(ctx=ctx) output.set_data(content_image) # optimizer trainer = gluon.Trainer([output], 'adam', {'learning_rate': args.lr}) mse_loss = gluon.loss.L2Loss() # optimizing the images for e in range(args.iters): utils.imagenet_clamp_batch(output.data(), 0, 255) # fix BN for pre-trained vgg with autograd.record(): features_y = vgg(output.data()) content_loss = 2 * args.content_weight * mse_loss( features_y[1], f_xc_c) style_loss = 0. for m in range(len(features_y)): gram_y = net.gram_matrix(features_y[m]) gram_s = gram_style[m] style_loss = style_loss + 2 * args.style_weight * mse_loss( gram_y, gram_s) total_loss = content_loss + style_loss total_loss.backward() trainer.step(1) if (e + 1) % args.log_interval == 0: print('loss:{:.2f}'.format(total_loss.asnumpy()[0])) # save the image output = utils.add_imagenet_mean_batch(output.data()) utils.tensor_save_bgrimage(output[0], args.output_image, args.cuda)
def optimize(args): """ Gatys et al. CVPR 2017 ref: Image Style Transfer Using Convolutional Neural Networks """ if args.cuda: ctx = mx.gpu(0) else: ctx = mx.cpu(0) # load the content and style target content_image = utils.tensor_load_rgbimage(args.content_image,ctx, size=args.content_size, keep_asp=True) content_image = utils.subtract_imagenet_mean_preprocess_batch(content_image) style_image = utils.tensor_load_rgbimage(args.style_image, ctx, size=args.style_size) style_image = utils.subtract_imagenet_mean_preprocess_batch(style_image) # load the pre-trained vgg-16 and extract features vgg = net.Vgg16() utils.init_vgg_params(vgg, 'models', ctx=ctx) # content feature f_xc_c = vgg(content_image)[1] # style feature features_style = vgg(style_image) gram_style = [net.gram_matrix(y) for y in features_style] # output output = Parameter('output', shape=content_image.shape) output.initialize(ctx=ctx) output.set_data(content_image) # optimizer trainer = gluon.Trainer([output], 'adam', {'learning_rate': args.lr}) mse_loss = gluon.loss.L2Loss() # optimizing the images for e in range(args.iters): utils.imagenet_clamp_batch(output.data(), 0, 255) # fix BN for pre-trained vgg with autograd.record(): features_y = vgg(output.data()) content_loss = 2 * args.content_weight * mse_loss(features_y[1], f_xc_c) style_loss = 0. for m in range(len(features_y)): gram_y = net.gram_matrix(features_y[m]) gram_s = gram_style[m] style_loss = style_loss + 2 * args.style_weight * mse_loss(gram_y, gram_s) total_loss = content_loss + style_loss total_loss.backward() trainer.step(1) if (e + 1) % args.log_interval == 0: print('loss:{:.2f}'.format(total_loss.asnumpy()[0])) # save the image output = utils.add_imagenet_mean_batch(output.data()) utils.tensor_save_bgrimage(output[0], args.output_image, args.cuda)
def train(args): np.random.seed(args.seed) if args.cuda: ctx = mx.gpu(0) else: ctx = mx.cpu(0) # dataloader transform = utils.Compose([utils.Scale(args.image_size), utils.CenterCrop(args.image_size), utils.ToTensor(ctx), ]) train_dataset = data.ImageFolder(args.dataset, transform) train_loader = gluon.data.DataLoader(train_dataset, batch_size=args.batch_size, last_batch='discard') style_loader = utils.StyleLoader(args.style_folder, args.style_size, ctx=ctx) print('len(style_loader):',style_loader.size()) # models vgg = net.Vgg16() utils.init_vgg_params(vgg, 'models', ctx=ctx) style_model = net.Net(ngf=args.ngf) style_model.initialize(init=mx.initializer.MSRAPrelu(), ctx=ctx) if args.resume is not None: print('Resuming, initializing using weight from {}.'.format(args.resume)) style_model.collect_params().load(args.resume, ctx=ctx) print('style_model:',style_model) # optimizer and loss trainer = gluon.Trainer(style_model.collect_params(), 'adam', {'learning_rate': args.lr}) mse_loss = gluon.loss.L2Loss() for e in range(args.epochs): agg_content_loss = 0. agg_style_loss = 0. count = 0 for batch_id, (x, _) in enumerate(train_loader): n_batch = len(x) count += n_batch # prepare data style_image = style_loader.get(batch_id) style_v = utils.subtract_imagenet_mean_preprocess_batch(style_image.copy()) style_image = utils.preprocess_batch(style_image) features_style = vgg(style_v) gram_style = [net.gram_matrix(y) for y in features_style] xc = utils.subtract_imagenet_mean_preprocess_batch(x.copy()) f_xc_c = vgg(xc)[1] with autograd.record(): style_model.setTarget(style_image) y = style_model(x) y = utils.subtract_imagenet_mean_batch(y) features_y = vgg(y) content_loss = 2 * args.content_weight * mse_loss(features_y[1], f_xc_c) style_loss = 0. for m in range(len(features_y)): gram_y = net.gram_matrix(features_y[m]) _, C, _ = gram_style[m].shape gram_s = F.expand_dims(gram_style[m], 0).broadcast_to((args.batch_size, 1, C, C)) style_loss = style_loss + 2 * args.style_weight * mse_loss(gram_y, gram_s[:n_batch, :, :]) total_loss = content_loss + style_loss total_loss.backward() trainer.step(args.batch_size) mx.nd.waitall() agg_content_loss += content_loss[0] agg_style_loss += style_loss[0] if (batch_id + 1) % args.log_interval == 0: mesg = "{}\tEpoch {}:\t[{}/{}]\tcontent: {:.3f}\tstyle: {:.3f}\ttotal: {:.3f}".format( time.ctime(), e + 1, count, len(train_dataset), agg_content_loss.asnumpy()[0] / (batch_id + 1), agg_style_loss.asnumpy()[0] / (batch_id + 1), (agg_content_loss + agg_style_loss).asnumpy()[0] / (batch_id + 1) ) print(mesg) if (batch_id + 1) % (4 * args.log_interval) == 0: # save model save_model_filename = "Epoch_" + str(e) + "iters_" + str(count) + "_" + str(time.ctime()).replace(' ', '_') + "_" + str( args.content_weight) + "_" + str(args.style_weight) + ".params" save_model_path = os.path.join(args.save_model_dir, save_model_filename) style_model.collect_params().save(save_model_path) print("\nCheckpoint, trained model saved at", save_model_path) # save model save_model_filename = "Final_epoch_" + str(args.epochs) + "_" + str(time.ctime()).replace(' ', '_') + "_" + str( args.content_weight) + "_" + str(args.style_weight) + ".params" save_model_path = os.path.join(args.save_model_dir, save_model_filename) style_model.collect_params().save(save_model_path) print("\nDone, trained model saved at", save_model_path)