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| # Copyright (c) Microsoft Corporation. | |
| # Licensed under the MIT License. | |
| import time | |
| from collections import OrderedDict | |
| from options.train_options import TrainOptions | |
| from data.data_loader import CreateDataLoader | |
| from models.models import create_model | |
| import util.util as util | |
| from util.visualizer import Visualizer | |
| import os | |
| import numpy as np | |
| import torch | |
| import torchvision.utils as vutils | |
| from torch.autograd import Variable | |
| import random | |
| opt = TrainOptions().parse() | |
| if opt.debug: | |
| opt.display_freq = 1 | |
| opt.print_freq = 1 | |
| opt.niter = 1 | |
| opt.niter_decay = 0 | |
| opt.max_dataset_size = 10 | |
| data_loader = CreateDataLoader(opt) | |
| dataset = data_loader.load_data() | |
| dataset_size = len(dataset) * opt.batchSize | |
| print('#training images = %d' % dataset_size) | |
| path = os.path.join(opt.checkpoints_dir, opt.name, 'model.txt') | |
| visualizer = Visualizer(opt) | |
| iter_path = os.path.join(opt.checkpoints_dir, opt.name, 'iter.txt') | |
| if opt.continue_train: | |
| try: | |
| start_epoch, epoch_iter = np.loadtxt(iter_path , delimiter=',', dtype=int) | |
| except: | |
| start_epoch, epoch_iter = 1, 0 | |
| visualizer.print_save('Resuming from epoch %d at iteration %d' % (start_epoch-1, epoch_iter)) | |
| else: | |
| start_epoch, epoch_iter = 1, 0 | |
| # opt.which_epoch=start_epoch-1 | |
| model = create_model(opt) | |
| fd = open(path, 'w') | |
| fd.write(str(model.module.netG)) | |
| fd.write(str(model.module.netD)) | |
| fd.close() | |
| total_steps = (start_epoch-1) * dataset_size + epoch_iter | |
| display_delta = total_steps % opt.display_freq | |
| print_delta = total_steps % opt.print_freq | |
| save_delta = total_steps % opt.save_latest_freq | |
| for epoch in range(start_epoch, opt.niter + opt.niter_decay + 1): | |
| epoch_start_time = time.time() | |
| if epoch != start_epoch: | |
| epoch_iter = epoch_iter % dataset_size | |
| for i, data in enumerate(dataset, start=epoch_iter): | |
| iter_start_time = time.time() | |
| total_steps += opt.batchSize | |
| epoch_iter += opt.batchSize | |
| # whether to collect output images | |
| save_fake = total_steps % opt.display_freq == display_delta | |
| ############## Forward Pass ###################### | |
| losses, generated = model(Variable(data['label']), Variable(data['inst']), | |
| Variable(data['image']), Variable(data['feat']), infer=save_fake) | |
| # sum per device losses | |
| losses = [ torch.mean(x) if not isinstance(x, int) else x for x in losses ] | |
| loss_dict = dict(zip(model.module.loss_names, losses)) | |
| # calculate final loss scalar | |
| loss_D = (loss_dict['D_fake'] + loss_dict['D_real']) * 0.5 | |
| loss_G = loss_dict['G_GAN'] + loss_dict.get('G_GAN_Feat',0) + loss_dict.get('G_VGG',0) + loss_dict['G_KL'] + loss_dict.get('Smooth_L1',0)*opt.L1_weight | |
| ############### Backward Pass #################### | |
| # update generator weights | |
| model.module.optimizer_G.zero_grad() | |
| loss_G.backward() | |
| model.module.optimizer_G.step() | |
| # update discriminator weights | |
| model.module.optimizer_D.zero_grad() | |
| loss_D.backward() | |
| model.module.optimizer_D.step() | |
| #call(["nvidia-smi", "--format=csv", "--query-gpu=memory.used,memory.free"]) | |
| ############## Display results and errors ########## | |
| ### print out errors | |
| if total_steps % opt.print_freq == print_delta: | |
| errors = {k: v.data if not isinstance(v, int) else v for k, v in loss_dict.items()} | |
| t = (time.time() - iter_start_time) / opt.batchSize | |
| visualizer.print_current_errors(epoch, epoch_iter, errors, t, model.module.old_lr) | |
| visualizer.plot_current_errors(errors, total_steps) | |
| ### display output images | |
| if save_fake: | |
| if not os.path.exists(opt.outputs_dir + opt.name): | |
| os.makedirs(opt.outputs_dir + opt.name) | |
| imgs_num = 5 | |
| imgs = torch.cat((data['label'][:imgs_num], generated.data.cpu()[:imgs_num], data['image'][:imgs_num]), 0) | |
| imgs = (imgs + 1.) / 2.0 | |
| try: | |
| image_grid = vutils.save_image(imgs, opt.outputs_dir + opt.name + '/' + str(epoch) + '_' + str(total_steps) + '.png', | |
| nrow=imgs_num, padding=0, normalize=True) | |
| except OSError as err: | |
| print(err) | |
| if epoch_iter >= dataset_size: | |
| break | |
| # end of epoch | |
| iter_end_time = time.time() | |
| print('End of epoch %d / %d \t Time Taken: %d sec' % | |
| (epoch, opt.niter + opt.niter_decay, time.time() - epoch_start_time)) | |
| ### save model for this epoch | |
| if epoch % opt.save_epoch_freq == 0: | |
| print('saving the model at the end of epoch %d, iters %d' % (epoch, total_steps)) | |
| model.module.save('latest') | |
| model.module.save(epoch) | |
| np.savetxt(iter_path, (epoch+1, 0), delimiter=',', fmt='%d') | |
| ### instead of only training the local enhancer, train the entire network after certain iterations | |
| if (opt.niter_fix_global != 0) and (epoch == opt.niter_fix_global): | |
| model.module.update_fixed_params() | |
| ### linearly decay learning rate after certain iterations | |
| if epoch > opt.niter: | |
| model.module.update_learning_rate() | |