import torch from collections import OrderedDict from os import path as osp from tqdm import tqdm from basicsr.archs import build_network from basicsr.losses import build_loss from basicsr.metrics import calculate_metric from basicsr.utils import get_root_logger, imwrite, tensor2img from basicsr.utils.registry import MODEL_REGISTRY from .base_model import BaseModel @MODEL_REGISTRY.register() class SRModel(BaseModel): """Base SR model for single image super-resolution.""" def __init__(self, opt): super(SRModel, self).__init__(opt) # define network self.net_g = build_network(opt['network_g']) self.net_g = self.model_to_device(self.net_g) self.print_network(self.net_g) # load pretrained models load_path = self.opt['path'].get('pretrain_network_g', None) if load_path is not None: param_key = self.opt['path'].get('param_key_g', 'params') self.load_network(self.net_g, load_path, self.opt['path'].get('strict_load_g', True), param_key) if self.is_train: self.init_training_settings() def init_training_settings(self): self.net_g.train() train_opt = self.opt['train'] self.ema_decay = train_opt.get('ema_decay', 0) if self.ema_decay > 0: logger = get_root_logger() logger.info(f'Use Exponential Moving Average with decay: {self.ema_decay}') # define network net_g with Exponential Moving Average (EMA) # net_g_ema is used only for testing on one GPU and saving # There is no need to wrap with DistributedDataParallel self.net_g_ema = build_network(self.opt['network_g']).to(self.device) # load pretrained model load_path = self.opt['path'].get('pretrain_network_g', None) if load_path is not None: self.load_network(self.net_g_ema, load_path, self.opt['path'].get('strict_load_g', True), 'params_ema') else: self.model_ema(0) # copy net_g weight self.net_g_ema.eval() # define losses if train_opt.get('pixel_opt'): self.cri_pix = build_loss(train_opt['pixel_opt']).to(self.device) else: self.cri_pix = None if train_opt.get('perceptual_opt'): self.cri_perceptual = build_loss(train_opt['perceptual_opt']).to(self.device) else: self.cri_perceptual = None if self.cri_pix is None and self.cri_perceptual is None: raise ValueError('Both pixel and perceptual losses are None.') # set up optimizers and schedulers self.setup_optimizers() self.setup_schedulers() def setup_optimizers(self): train_opt = self.opt['train'] optim_params = [] for k, v in self.net_g.named_parameters(): if v.requires_grad: optim_params.append(v) else: logger = get_root_logger() logger.warning(f'Params {k} will not be optimized.') optim_type = train_opt['optim_g'].pop('type') self.optimizer_g = self.get_optimizer(optim_type, optim_params, **train_opt['optim_g']) self.optimizers.append(self.optimizer_g) def feed_data(self, data): self.lq = data['lq'].to(self.device) if 'gt' in data: self.gt = data['gt'].to(self.device) def optimize_parameters(self, current_iter): self.optimizer_g.zero_grad() self.output = self.net_g(self.lq) l_total = 0 loss_dict = OrderedDict() # pixel loss if self.cri_pix: l_pix = self.cri_pix(self.output, self.gt) l_total += l_pix loss_dict['l_pix'] = l_pix # perceptual loss if self.cri_perceptual: l_percep, l_style = self.cri_perceptual(self.output, self.gt) if l_percep is not None: l_total += l_percep loss_dict['l_percep'] = l_percep if l_style is not None: l_total += l_style loss_dict['l_style'] = l_style l_total.backward() self.optimizer_g.step() self.log_dict = self.reduce_loss_dict(loss_dict) if self.ema_decay > 0: self.model_ema(decay=self.ema_decay) def test(self): if hasattr(self, 'ema_decay'): self.net_g_ema.eval() with torch.no_grad(): self.output = self.net_g_ema(self.lq) else: self.net_g.eval() with torch.no_grad(): self.output = self.net_g(self.lq) self.net_g.train() def dist_validation(self, dataloader, current_iter, tb_logger, save_img): if self.opt['rank'] == 0: self.nondist_validation(dataloader, current_iter, tb_logger, save_img) def nondist_validation(self, dataloader, current_iter, tb_logger, save_img): dataset_name = dataloader.dataset.opt['name'] with_metrics = self.opt['val'].get('metrics') is not None if with_metrics: self.metric_results = {metric: 0 for metric in self.opt['val']['metrics'].keys()} pbar = tqdm(total=len(dataloader), unit='image') for idx, val_data in enumerate(dataloader): img_name = osp.splitext(osp.basename(val_data['lq_path'][0]))[0] self.feed_data(val_data) self.test() visuals = self.get_current_visuals() sr_img = tensor2img([visuals['result']]) if 'gt' in visuals: gt_img = tensor2img([visuals['gt']]) del self.gt # tentative for out of GPU memory del self.lq del self.output torch.cuda.empty_cache() if save_img: if self.opt['is_train']: save_img_path = osp.join(self.opt['path']['visualization'], img_name, f'{img_name}_{current_iter}.png') else: if self.opt['val']['suffix']: save_img_path = osp.join(self.opt['path']['visualization'], dataset_name, f'{img_name}_{self.opt["val"]["suffix"]}.png') else: save_img_path = osp.join(self.opt['path']['visualization'], dataset_name, f'{img_name}_{self.opt["name"]}.png') imwrite(sr_img, save_img_path) if with_metrics: # calculate metrics for name, opt_ in self.opt['val']['metrics'].items(): metric_data = dict(img1=sr_img, img2=gt_img) self.metric_results[name] += calculate_metric(metric_data, opt_) pbar.update(1) pbar.set_description(f'Test {img_name}') pbar.close() if with_metrics: for metric in self.metric_results.keys(): self.metric_results[metric] /= (idx + 1) self._log_validation_metric_values(current_iter, dataset_name, tb_logger) def _log_validation_metric_values(self, current_iter, dataset_name, tb_logger): log_str = f'Validation {dataset_name}\n' for metric, value in self.metric_results.items(): log_str += f'\t # {metric}: {value:.4f}\n' logger = get_root_logger() logger.info(log_str) if tb_logger: for metric, value in self.metric_results.items(): tb_logger.add_scalar(f'metrics/{metric}', value, current_iter) def get_current_visuals(self): out_dict = OrderedDict() out_dict['lq'] = self.lq.detach().cpu() out_dict['result'] = self.output.detach().cpu() if hasattr(self, 'gt'): out_dict['gt'] = self.gt.detach().cpu() return out_dict def save(self, epoch, current_iter): if hasattr(self, 'ema_decay'): self.save_network([self.net_g, self.net_g_ema], 'net_g', current_iter, param_key=['params', 'params_ema']) else: self.save_network(self.net_g, 'net_g', current_iter) self.save_training_state(epoch, current_iter)