#!/usr/bin/env python """ ImageNet Training Script This is intended to be a lean and easily modifiable ImageNet training script that reproduces ImageNet training results with some of the latest networks and training techniques. It favours canonical PyTorch and standard Python style over trying to be able to 'do it all.' That said, it offers quite a few speed and training result improvements over the usual PyTorch example scripts. Repurpose as you see fit. This script was started from an early version of the PyTorch ImageNet example (https://github.com/pytorch/examples/tree/master/imagenet) NVIDIA CUDA specific speedups adopted from NVIDIA Apex examples (https://github.com/NVIDIA/apex/tree/master/examples/imagenet) Hacked together by / Copyright 2020 Ross Wightman (https://github.com/rwightman) """ import argparse import time import yaml from datetime import datetime try: from apex import amp from apex.parallel import DistributedDataParallel as DDP from apex.parallel import convert_syncbn_model has_apex = True except ImportError: from torch.nn.parallel import DistributedDataParallel as DDP has_apex = False from timm.data import Dataset, create_loader, resolve_data_config, FastCollateMixup, mixup_batch, AugMixDataset from timm.models import create_model, resume_checkpoint, convert_splitbn_model from timm.utils import * from timm.loss import LabelSmoothingCrossEntropy, SoftTargetCrossEntropy, JsdCrossEntropy from timm.optim import create_optimizer from timm.scheduler import create_scheduler import torch import torch.nn as nn import torchvision.utils torch.backends.cudnn.benchmark = True # The first arg parser parses out only the --config argument, this argument is used to # load a yaml file containing key-values that override the defaults for the main parser below config_parser = parser = argparse.ArgumentParser(description='Training Config', add_help=False) parser.add_argument('-c', '--config', default='', type=str, metavar='FILE', help='YAML config file specifying default arguments') parser = argparse.ArgumentParser(description='PyTorch ImageNet Training') # Dataset / Model parameters parser.add_argument('data', metavar='DIR', help='path to dataset') parser.add_argument('--model', default='resnet101', type=str, metavar='MODEL', help='Name of model to train (default: "countception"') parser.add_argument('--pretrained', action='store_true', default=False, help='Start with pretrained version of specified network (if avail)') parser.add_argument('--initial-checkpoint', default='', type=str, metavar='PATH', help='Initialize model from this checkpoint (default: none)') parser.add_argument('--resume', default='', type=str, metavar='PATH', help='Resume full model and optimizer state from checkpoint (default: none)') parser.add_argument('--no-resume-opt', action='store_true', default=False, help='prevent resume of optimizer state when resuming model') parser.add_argument('--num-classes', type=int, default=1000, metavar='N', help='number of label classes (default: 1000)') parser.add_argument('--gp', default='avg', type=str, metavar='POOL', help='Type of global pool, "avg", "max", "avgmax", "avgmaxc" (default: "avg")') parser.add_argument('--img-size', type=int, default=None, metavar='N', help='Image patch size (default: None => model default)') parser.add_argument('--crop-pct', default=None, type=float, metavar='N', help='Input image center crop percent (for validation only)') parser.add_argument('--mean', type=float, nargs='+', default=None, metavar='MEAN', help='Override mean pixel value of dataset') parser.add_argument('--std', type=float, nargs='+', default=None, metavar='STD', help='Override std deviation of of dataset') parser.add_argument('--interpolation', default='', type=str, metavar='NAME', help='Image resize interpolation type (overrides model)') parser.add_argument('-b', '--batch-size', type=int, default=32, metavar='N', help='input batch size for training (default: 32)') parser.add_argument('-vb', '--validation-batch-size-multiplier', type=int, default=1, metavar='N', help='ratio of validation batch size to training batch size (default: 1)') parser.add_argument('--drop', type=float, default=0.0, metavar='PCT', help='Dropout rate (default: 0.)') parser.add_argument('--drop-connect', type=float, default=None, metavar='PCT', help='Drop connect rate, DEPRECATED, use drop-path (default: None)') parser.add_argument('--drop-path', type=float, default=None, metavar='PCT', help='Drop path rate (default: None)') parser.add_argument('--drop-block', type=float, default=None, metavar='PCT', help='Drop block rate (default: None)') parser.add_argument('--jsd', action='store_true', default=False, help='Enable Jensen-Shannon Divergence + CE loss. Use with `--aug-splits`.') # Optimizer parameters parser.add_argument('--opt', default='sgd', type=str, metavar='OPTIMIZER', help='Optimizer (default: "sgd"') parser.add_argument('--opt-eps', default=1e-8, type=float, metavar='EPSILON', help='Optimizer Epsilon (default: 1e-8)') parser.add_argument('--momentum', type=float, default=0.9, metavar='M', help='SGD momentum (default: 0.9)') parser.add_argument('--weight-decay', type=float, default=0.0001, help='weight decay (default: 0.0001)') # Learning rate schedule parameters parser.add_argument('--sched', default='step', type=str, metavar='SCHEDULER', help='LR scheduler (default: "step"') parser.add_argument('--lr', type=float, default=0.01, metavar='LR', help='learning rate (default: 0.01)') parser.add_argument('--lr-noise', type=float, nargs='+', default=None, metavar='pct, pct', help='learning rate noise on/off epoch percentages') parser.add_argument('--lr-noise-pct', type=float, default=0.67, metavar='PERCENT', help='learning rate noise limit percent (default: 0.67)') parser.add_argument('--lr-noise-std', type=float, default=1.0, metavar='STDDEV', help='learning rate noise std-dev (default: 1.0)') parser.add_argument('--lr-cycle-mul', type=float, default=1.0, metavar='MULT', help='learning rate cycle len multiplier (default: 1.0)') parser.add_argument('--lr-cycle-limit', type=int, default=1, metavar='N', help='learning rate cycle limit') parser.add_argument('--warmup-lr', type=float, default=0.0001, metavar='LR', help='warmup learning rate (default: 0.0001)') parser.add_argument('--min-lr', type=float, default=1e-5, metavar='LR', help='lower lr bound for cyclic schedulers that hit 0 (1e-5)') parser.add_argument('--epochs', type=int, default=200, metavar='N', help='number of epochs to train (default: 2)') parser.add_argument('--start-epoch', default=None, type=int, metavar='N', help='manual epoch number (useful on restarts)') parser.add_argument('--decay-epochs', type=float, default=30, metavar='N', help='epoch interval to decay LR') parser.add_argument('--warmup-epochs', type=int, default=3, metavar='N', help='epochs to warmup LR, if scheduler supports') parser.add_argument('--cooldown-epochs', type=int, default=10, metavar='N', help='epochs to cooldown LR at min_lr, after cyclic schedule ends') parser.add_argument('--patience-epochs', type=int, default=10, metavar='N', help='patience epochs for Plateau LR scheduler (default: 10') parser.add_argument('--decay-rate', '--dr', type=float, default=0.1, metavar='RATE', help='LR decay rate (default: 0.1)') # Augmentation parameters parser.add_argument('--color-jitter', type=float, default=0.4, metavar='PCT', help='Color jitter factor (default: 0.4)') parser.add_argument('--aa', type=str, default=None, metavar='NAME', help='Use AutoAugment policy. "v0" or "original". (default: None)'), parser.add_argument('--aug-splits', type=int, default=0, help='Number of augmentation splits (default: 0, valid: 0 or >=2)') parser.add_argument('--reprob', type=float, default=0., metavar='PCT', help='Random erase prob (default: 0.)') parser.add_argument('--remode', type=str, default='const', help='Random erase mode (default: "const")') parser.add_argument('--recount', type=int, default=1, help='Random erase count (default: 1)') parser.add_argument('--resplit', action='store_true', default=False, help='Do not random erase first (clean) augmentation split') parser.add_argument('--mixup', type=float, default=0.0, help='mixup alpha, mixup enabled if > 0. (default: 0.)') parser.add_argument('--mixup-off-epoch', default=0, type=int, metavar='N', help='turn off mixup after this epoch, disabled if 0 (default: 0)') parser.add_argument('--smoothing', type=float, default=0.1, help='label smoothing (default: 0.1)') parser.add_argument('--train-interpolation', type=str, default='random', help='Training interpolation (random, bilinear, bicubic default: "random")') # Batch norm parameters (only works with gen_efficientnet based models currently) parser.add_argument('--bn-tf', action='store_true', default=False, help='Use Tensorflow BatchNorm defaults for models that support it (default: False)') parser.add_argument('--bn-momentum', type=float, default=None, help='BatchNorm momentum override (if not None)') parser.add_argument('--bn-eps', type=float, default=None, help='BatchNorm epsilon override (if not None)') parser.add_argument('--sync-bn', action='store_true', help='Enable NVIDIA Apex or Torch synchronized BatchNorm.') parser.add_argument('--dist-bn', type=str, default='', help='Distribute BatchNorm stats between nodes after each epoch ("broadcast", "reduce", or "")') parser.add_argument('--split-bn', action='store_true', help='Enable separate BN layers per augmentation split.') # Model Exponential Moving Average parser.add_argument('--model-ema', action='store_true', default=False, help='Enable tracking moving average of model weights') parser.add_argument('--model-ema-force-cpu', action='store_true', default=False, help='Force ema to be tracked on CPU, rank=0 node only. Disables EMA validation.') parser.add_argument('--model-ema-decay', type=float, default=0.9998, help='decay factor for model weights moving average (default: 0.9998)') # Misc parser.add_argument('--seed', type=int, default=42, metavar='S', help='random seed (default: 42)') parser.add_argument('--log-interval', type=int, default=50, metavar='N', help='how many batches to wait before logging training status') parser.add_argument('--recovery-interval', type=int, default=0, metavar='N', help='how many batches to wait before writing recovery checkpoint') parser.add_argument('-j', '--workers', type=int, default=4, metavar='N', help='how many training processes to use (default: 1)') parser.add_argument('--num-gpu', type=int, default=1, help='Number of GPUS to use') parser.add_argument('--save-images', action='store_true', default=False, help='save images of input bathes every log interval for debugging') parser.add_argument('--amp', action='store_true', default=False, help='use NVIDIA amp for mixed precision training') parser.add_argument('--pin-mem', action='store_true', default=False, help='Pin CPU memory in DataLoader for more efficient (sometimes) transfer to GPU.') parser.add_argument('--no-prefetcher', action='store_true', default=False, help='disable fast prefetcher') parser.add_argument('--output', default='', type=str, metavar='PATH', help='path to output folder (default: none, current dir)') parser.add_argument('--eval-metric', default='top1', type=str, metavar='EVAL_METRIC', help='Best metric (default: "top1"') parser.add_argument('--tta', type=int, default=0, metavar='N', help='Test/inference time augmentation (oversampling) factor. 0=None (default: 0)') parser.add_argument("--local_rank", default=0, type=int) parser.add_argument('--use-multi-epochs-loader', action='store_true', default=False, help='use the multi-epochs-loader to save time at the beginning of every epoch') def _parse_args(): # Do we have a config file to parse? args_config, remaining = config_parser.parse_known_args() if args_config.config: with open(args_config.config, 'r') as f: cfg = yaml.safe_load(f) parser.set_defaults(**cfg) # The main arg parser parses the rest of the args, the usual # defaults will have been overridden if config file specified. args = parser.parse_args(remaining) # Cache the args as a text string to save them in the output dir later args_text = yaml.safe_dump(args.__dict__, default_flow_style=False) return args, args_text def main(): setup_default_logging() args, args_text = _parse_args() args.prefetcher = not args.no_prefetcher args.distributed = False if 'WORLD_SIZE' in os.environ: args.distributed = int(os.environ['WORLD_SIZE']) > 1 if args.distributed and args.num_gpu > 1: logging.warning('Using more than one GPU per process in distributed mode is not allowed. Setting num_gpu to 1.') args.num_gpu = 1 args.device = 'cuda:0' args.world_size = 1 args.rank = 0 # global rank if args.distributed: args.num_gpu = 1 args.device = 'cuda:%d' % args.local_rank torch.cuda.set_device(args.local_rank) torch.distributed.init_process_group(backend='nccl', init_method='env://') args.world_size = torch.distributed.get_world_size() args.rank = torch.distributed.get_rank() assert args.rank >= 0 if args.distributed: logging.info('Training in distributed mode with multiple processes, 1 GPU per process. Process %d, total %d.' % (args.rank, args.world_size)) else: logging.info('Training with a single process on %d GPUs.' % args.num_gpu) torch.manual_seed(args.seed + args.rank) model = create_model( args.model, pretrained=args.pretrained, num_classes=args.num_classes, drop_rate=args.drop, drop_connect_rate=args.drop_connect, # DEPRECATED, use drop_path drop_path_rate=args.drop_path, drop_block_rate=args.drop_block, global_pool=args.gp, bn_tf=args.bn_tf, bn_momentum=args.bn_momentum, bn_eps=args.bn_eps, checkpoint_path=args.initial_checkpoint) if args.local_rank == 0: logging.info('Model %s created, param count: %d' % (args.model, sum([m.numel() for m in model.parameters()]))) data_config = resolve_data_config(vars(args), model=model, verbose=args.local_rank == 0) num_aug_splits = 0 if args.aug_splits > 0: assert args.aug_splits > 1, 'A split of 1 makes no sense' num_aug_splits = args.aug_splits if args.split_bn: assert num_aug_splits > 1 or args.resplit model = convert_splitbn_model(model, max(num_aug_splits, 2)) if args.num_gpu > 1: if args.amp: logging.warning( 'AMP does not work well with nn.DataParallel, disabling. Use distributed mode for multi-GPU AMP.') args.amp = False model = nn.DataParallel(model, device_ids=list(range(args.num_gpu))).cuda() else: model.cuda() optimizer = create_optimizer(args, model) use_amp = False if has_apex and args.amp: model, optimizer = amp.initialize(model, optimizer, opt_level='O1') use_amp = True if args.local_rank == 0: logging.info('NVIDIA APEX {}. AMP {}.'.format( 'installed' if has_apex else 'not installed', 'on' if use_amp else 'off')) # optionally resume from a checkpoint resume_state = {} resume_epoch = None if args.resume: resume_state, resume_epoch = resume_checkpoint(model, args.resume) if resume_state and not args.no_resume_opt: if 'optimizer' in resume_state: if args.local_rank == 0: logging.info('Restoring Optimizer state from checkpoint') optimizer.load_state_dict(resume_state['optimizer']) if use_amp and 'amp' in resume_state and 'load_state_dict' in amp.__dict__: if args.local_rank == 0: logging.info('Restoring NVIDIA AMP state from checkpoint') amp.load_state_dict(resume_state['amp']) del resume_state model_ema = None if args.model_ema: # Important to create EMA model after cuda(), DP wrapper, and AMP but before SyncBN and DDP wrapper model_ema = ModelEma( model, decay=args.model_ema_decay, device='cpu' if args.model_ema_force_cpu else '', resume=args.resume) if args.distributed: if args.sync_bn: assert not args.split_bn try: if has_apex: model = convert_syncbn_model(model) else: model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model) if args.local_rank == 0: logging.info( 'Converted model to use Synchronized BatchNorm. WARNING: You may have issues if using ' 'zero initialized BN layers (enabled by default for ResNets) while sync-bn enabled.') except Exception as e: logging.error('Failed to enable Synchronized BatchNorm. Install Apex or Torch >= 1.1') if has_apex: model = DDP(model, delay_allreduce=True) else: if args.local_rank == 0: logging.info("Using torch DistributedDataParallel. Install NVIDIA Apex for Apex DDP.") model = DDP(model, device_ids=[args.local_rank]) # can use device str in Torch >= 1.1 # NOTE: EMA model does not need to be wrapped by DDP lr_scheduler, num_epochs = create_scheduler(args, optimizer) start_epoch = 0 if args.start_epoch is not None: # a specified start_epoch will always override the resume epoch start_epoch = args.start_epoch elif resume_epoch is not None: start_epoch = resume_epoch if lr_scheduler is not None and start_epoch > 0: lr_scheduler.step(start_epoch) if args.local_rank == 0: logging.info('Scheduled epochs: {}'.format(num_epochs)) train_dir = os.path.join(args.data, 'train') if not os.path.exists(train_dir): logging.error('Training folder does not exist at: {}'.format(train_dir)) exit(1) dataset_train = Dataset(train_dir) collate_fn = None if args.prefetcher and args.mixup > 0: assert not num_aug_splits # collate conflict (need to support deinterleaving in collate mixup) collate_fn = FastCollateMixup(args.mixup, args.smoothing, args.num_classes) if num_aug_splits > 1: dataset_train = AugMixDataset(dataset_train, num_splits=num_aug_splits) loader_train = create_loader( dataset_train, input_size=data_config['input_size'], batch_size=args.batch_size, is_training=True, use_prefetcher=args.prefetcher, re_prob=args.reprob, re_mode=args.remode, re_count=args.recount, re_split=args.resplit, color_jitter=args.color_jitter, auto_augment=args.aa, num_aug_splits=num_aug_splits, interpolation=args.train_interpolation, mean=data_config['mean'], std=data_config['std'], num_workers=args.workers, distributed=args.distributed, collate_fn=collate_fn, pin_memory=args.pin_mem, use_multi_epochs_loader=args.use_multi_epochs_loader ) eval_dir = os.path.join(args.data, 'val') if not os.path.isdir(eval_dir): eval_dir = os.path.join(args.data, 'validation') if not os.path.isdir(eval_dir): logging.error('Validation folder does not exist at: {}'.format(eval_dir)) exit(1) dataset_eval = Dataset(eval_dir) loader_eval = create_loader( dataset_eval, input_size=data_config['input_size'], batch_size=args.validation_batch_size_multiplier * args.batch_size, is_training=False, use_prefetcher=args.prefetcher, interpolation=data_config['interpolation'], mean=data_config['mean'], std=data_config['std'], num_workers=args.workers, distributed=args.distributed, crop_pct=data_config['crop_pct'], pin_memory=args.pin_mem, ) if args.jsd: assert num_aug_splits > 1 # JSD only valid with aug splits set train_loss_fn = JsdCrossEntropy(num_splits=num_aug_splits, smoothing=args.smoothing).cuda() validate_loss_fn = nn.CrossEntropyLoss().cuda() elif args.mixup > 0.: # smoothing is handled with mixup label transform train_loss_fn = SoftTargetCrossEntropy().cuda() validate_loss_fn = nn.CrossEntropyLoss().cuda() elif args.smoothing: train_loss_fn = LabelSmoothingCrossEntropy(smoothing=args.smoothing).cuda() validate_loss_fn = nn.CrossEntropyLoss().cuda() else: train_loss_fn = nn.CrossEntropyLoss().cuda() validate_loss_fn = train_loss_fn eval_metric = args.eval_metric best_metric = None best_epoch = None saver = None output_dir = '' if args.local_rank == 0: output_base = args.output if args.output else './output' exp_name = '-'.join([ datetime.now().strftime("%Y%m%d-%H%M%S"), args.model, str(data_config['input_size'][-1]) ]) output_dir = get_outdir(output_base, 'train', exp_name) decreasing = True if eval_metric == 'loss' else False saver = CheckpointSaver(checkpoint_dir=output_dir, decreasing=decreasing) with open(os.path.join(output_dir, 'args.yaml'), 'w') as f: f.write(args_text) try: for epoch in range(start_epoch, num_epochs): if args.distributed: loader_train.sampler.set_epoch(epoch) train_metrics = train_epoch( epoch, model, loader_train, optimizer, train_loss_fn, args, lr_scheduler=lr_scheduler, saver=saver, output_dir=output_dir, use_amp=use_amp, model_ema=model_ema) if args.distributed and args.dist_bn in ('broadcast', 'reduce'): if args.local_rank == 0: logging.info("Distributing BatchNorm running means and vars") distribute_bn(model, args.world_size, args.dist_bn == 'reduce') eval_metrics = validate(model, loader_eval, validate_loss_fn, args) if model_ema is not None and not args.model_ema_force_cpu: if args.distributed and args.dist_bn in ('broadcast', 'reduce'): distribute_bn(model_ema, args.world_size, args.dist_bn == 'reduce') ema_eval_metrics = validate( model_ema.ema, loader_eval, validate_loss_fn, args, log_suffix=' (EMA)') eval_metrics = ema_eval_metrics if lr_scheduler is not None: # step LR for next epoch lr_scheduler.step(epoch + 1, eval_metrics[eval_metric]) update_summary( epoch, train_metrics, eval_metrics, os.path.join(output_dir, 'summary.csv'), write_header=best_metric is None) if saver is not None: # save proper checkpoint with eval metric save_metric = eval_metrics[eval_metric] best_metric, best_epoch = saver.save_checkpoint( model, optimizer, args, epoch=epoch, model_ema=model_ema, metric=save_metric, use_amp=use_amp) except KeyboardInterrupt: pass if best_metric is not None: logging.info('*** Best metric: {0} (epoch {1})'.format(best_metric, best_epoch)) def train_epoch( epoch, model, loader, optimizer, loss_fn, args, lr_scheduler=None, saver=None, output_dir='', use_amp=False, model_ema=None): if args.prefetcher and args.mixup > 0 and loader.mixup_enabled: if args.mixup_off_epoch and epoch >= args.mixup_off_epoch: loader.mixup_enabled = False batch_time_m = AverageMeter() data_time_m = AverageMeter() losses_m = AverageMeter() model.train() end = time.time() last_idx = len(loader) - 1 num_updates = epoch * len(loader) for batch_idx, (input, target) in enumerate(loader): last_batch = batch_idx == last_idx data_time_m.update(time.time() - end) if not args.prefetcher: input, target = input.cuda(), target.cuda() if args.mixup > 0.: input, target = mixup_batch( input, target, alpha=args.mixup, num_classes=args.num_classes, smoothing=args.smoothing, disable=args.mixup_off_epoch and epoch >= args.mixup_off_epoch) output = model(input) loss = loss_fn(output, target) if not args.distributed: losses_m.update(loss.item(), input.size(0)) optimizer.zero_grad() if use_amp: with amp.scale_loss(loss, optimizer) as scaled_loss: scaled_loss.backward() else: loss.backward() optimizer.step() torch.cuda.synchronize() if model_ema is not None: model_ema.update(model) num_updates += 1 batch_time_m.update(time.time() - end) if last_batch or batch_idx % args.log_interval == 0: lrl = [param_group['lr'] for param_group in optimizer.param_groups] lr = sum(lrl) / len(lrl) if args.distributed: reduced_loss = reduce_tensor(loss.data, args.world_size) losses_m.update(reduced_loss.item(), input.size(0)) if args.local_rank == 0: logging.info( 'Train: {} [{:>4d}/{} ({:>3.0f}%)] ' 'Loss: {loss.val:>9.6f} ({loss.avg:>6.4f}) ' 'Time: {batch_time.val:.3f}s, {rate:>7.2f}/s ' '({batch_time.avg:.3f}s, {rate_avg:>7.2f}/s) ' 'LR: {lr:.3e} ' 'Data: {data_time.val:.3f} ({data_time.avg:.3f})'.format( epoch, batch_idx, len(loader), 100. * batch_idx / last_idx, loss=losses_m, batch_time=batch_time_m, rate=input.size(0) * args.world_size / batch_time_m.val, rate_avg=input.size(0) * args.world_size / batch_time_m.avg, lr=lr, data_time=data_time_m)) if args.save_images and output_dir: torchvision.utils.save_image( input, os.path.join(output_dir, 'train-batch-%d.jpg' % batch_idx), padding=0, normalize=True) if saver is not None and args.recovery_interval and ( last_batch or (batch_idx + 1) % args.recovery_interval == 0): saver.save_recovery( model, optimizer, args, epoch, model_ema=model_ema, use_amp=use_amp, batch_idx=batch_idx) if lr_scheduler is not None: lr_scheduler.step_update(num_updates=num_updates, metric=losses_m.avg) end = time.time() # end for if hasattr(optimizer, 'sync_lookahead'): optimizer.sync_lookahead() return OrderedDict([('loss', losses_m.avg)]) def validate(model, loader, loss_fn, args, log_suffix=''): batch_time_m = AverageMeter() losses_m = AverageMeter() top1_m = AverageMeter() top5_m = AverageMeter() model.eval() end = time.time() last_idx = len(loader) - 1 with torch.no_grad(): for batch_idx, (input, target) in enumerate(loader): last_batch = batch_idx == last_idx if not args.prefetcher: input = input.cuda() target = target.cuda() output = model(input) if isinstance(output, (tuple, list)): output = output[0] # augmentation reduction reduce_factor = args.tta if reduce_factor > 1: output = output.unfold(0, reduce_factor, reduce_factor).mean(dim=2) target = target[0:target.size(0):reduce_factor] loss = loss_fn(output, target) acc1, acc5 = accuracy(output, target, topk=(1, 5)) if args.distributed: reduced_loss = reduce_tensor(loss.data, args.world_size) acc1 = reduce_tensor(acc1, args.world_size) acc5 = reduce_tensor(acc5, args.world_size) else: reduced_loss = loss.data torch.cuda.synchronize() losses_m.update(reduced_loss.item(), input.size(0)) top1_m.update(acc1.item(), output.size(0)) top5_m.update(acc5.item(), output.size(0)) batch_time_m.update(time.time() - end) end = time.time() if args.local_rank == 0 and (last_batch or batch_idx % args.log_interval == 0): log_name = 'Test' + log_suffix logging.info( '{0}: [{1:>4d}/{2}] ' 'Time: {batch_time.val:.3f} ({batch_time.avg:.3f}) ' 'Loss: {loss.val:>7.4f} ({loss.avg:>6.4f}) ' 'Acc@1: {top1.val:>7.4f} ({top1.avg:>7.4f}) ' 'Acc@5: {top5.val:>7.4f} ({top5.avg:>7.4f})'.format( log_name, batch_idx, last_idx, batch_time=batch_time_m, loss=losses_m, top1=top1_m, top5=top5_m)) metrics = OrderedDict([('loss', losses_m.avg), ('top1', top1_m.avg), ('top5', top5_m.avg)]) return metrics if __name__ == '__main__': main()