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afn.py
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afn.py
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"""
@author: Baixu Chen
@contact: [email protected]
"""
import random
import time
import warnings
import argparse
import shutil
import os.path as osp
import torch
import torch.nn as nn
import torch.backends.cudnn as cudnn
from torch.optim import SGD
from torch.utils.data import DataLoader
import torch.nn.functional as F
import utils
from tllib.normalization.afn import AdaptiveFeatureNorm, ImageClassifier
from tllib.modules.entropy import entropy
from tllib.utils.data import ForeverDataIterator
from tllib.utils.metric import accuracy
from tllib.utils.meter import AverageMeter, ProgressMeter
from tllib.utils.logger import CompleteLogger
from tllib.utils.analysis import collect_feature, tsne, a_distance
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
def main(args: argparse.Namespace):
logger = CompleteLogger(args.log, args.phase)
print(args)
if args.seed is not None:
random.seed(args.seed)
torch.manual_seed(args.seed)
cudnn.deterministic = True
warnings.warn('You have chosen to seed training. '
'This will turn on the CUDNN deterministic setting, '
'which can slow down your training considerably! '
'You may see unexpected behavior when restarting '
'from checkpoints.')
cudnn.benchmark = True
# Data loading code
train_transform = utils.get_train_transform(args.train_resizing, random_horizontal_flip=not args.no_hflip,
random_color_jitter=False, resize_size=args.resize_size,
norm_mean=args.norm_mean, norm_std=args.norm_std)
val_transform = utils.get_val_transform(args.val_resizing, resize_size=args.resize_size,
norm_mean=args.norm_mean, norm_std=args.norm_std)
print("train_transform: ", train_transform)
print("val_transform: ", val_transform)
train_source_dataset, train_target_dataset, val_dataset, test_dataset, num_classes, args.class_names = \
utils.get_dataset(args.data, args.root, args.source, args.target, train_transform, val_transform)
train_source_loader = DataLoader(train_source_dataset, batch_size=args.batch_size,
shuffle=True, num_workers=args.workers, drop_last=True)
train_target_loader = DataLoader(train_target_dataset, batch_size=args.batch_size,
shuffle=True, num_workers=args.workers, drop_last=True)
val_loader = DataLoader(val_dataset, batch_size=args.batch_size, shuffle=False, num_workers=args.workers)
test_loader = DataLoader(test_dataset, batch_size=args.batch_size, shuffle=False, num_workers=args.workers)
train_source_iter = ForeverDataIterator(train_source_loader)
train_target_iter = ForeverDataIterator(train_target_loader)
# create model
print("=> using model '{}'".format(args.arch))
backbone = utils.get_model(args.arch, pretrain=not args.scratch)
pool_layer = nn.Identity() if args.no_pool else None
classifier = ImageClassifier(backbone, num_classes, args.num_blocks,
bottleneck_dim=args.bottleneck_dim, dropout_p=args.dropout_p,
pool_layer=pool_layer, finetune=not args.scratch).to(device)
adaptive_feature_norm = AdaptiveFeatureNorm(args.delta).to(device)
# define optimizer
# the learning rate is fixed according to origin paper
optimizer = SGD(classifier.get_parameters(), args.lr, weight_decay=args.weight_decay)
# resume from the best checkpoint
if args.phase != 'train':
checkpoint = torch.load(logger.get_checkpoint_path('best'), map_location='cpu')
classifier.load_state_dict(checkpoint)
# analysis the model
if args.phase == 'analysis':
# extract features from both domains
feature_extractor = nn.Sequential(classifier.backbone, classifier.pool_layer, classifier.bottleneck).to(device)
source_feature = collect_feature(train_source_loader, feature_extractor, device)
target_feature = collect_feature(train_target_loader, feature_extractor, device)
# plot t-SNE
tSNE_filename = osp.join(logger.visualize_directory, 'TSNE.pdf')
tsne.visualize(source_feature, target_feature, tSNE_filename)
print("Saving t-SNE to", tSNE_filename)
# calculate A-distance, which is a measure for distribution discrepancy
A_distance = a_distance.calculate(source_feature, target_feature, device)
print("A-distance =", A_distance)
return
if args.phase == 'test':
acc1 = utils.validate(test_loader, classifier, args, device)
print(acc1)
return
# start training
best_acc1 = 0.
for epoch in range(args.epochs):
# train for one epoch
train(train_source_iter, train_target_iter, classifier, adaptive_feature_norm, optimizer, epoch, args)
# evaluate on validation set
acc1 = utils.validate(val_loader, classifier, args, device)
# remember best acc@1 and save checkpoint
torch.save(classifier.state_dict(), logger.get_checkpoint_path('latest'))
if acc1 > best_acc1:
shutil.copy(logger.get_checkpoint_path('latest'), logger.get_checkpoint_path('best'))
best_acc1 = max(acc1, best_acc1)
print("best_acc1 = {:3.1f}".format(best_acc1))
# evaluate on test set
classifier.load_state_dict(torch.load(logger.get_checkpoint_path('best')))
acc1 = utils.validate(test_loader, classifier, args, device)
print("test_acc1 = {:3.1f}".format(acc1))
logger.close()
def train(train_source_iter: ForeverDataIterator, train_target_iter: ForeverDataIterator, model: ImageClassifier,
adaptive_feature_norm: AdaptiveFeatureNorm, optimizer: SGD, epoch: int, args: argparse.Namespace):
batch_time = AverageMeter('Time', ':3.1f')
data_time = AverageMeter('Data', ':3.1f')
cls_losses = AverageMeter('Cls Loss', ':3.2f')
norm_losses = AverageMeter('Norm Loss', ':3.2f')
src_feature_norm = AverageMeter('Source Feature Norm', ':3.2f')
tgt_feature_norm = AverageMeter('Target Feature Norm', ':3.2f')
cls_accs = AverageMeter('Cls Acc', ':3.1f')
progress = ProgressMeter(
args.iters_per_epoch,
[batch_time, data_time, cls_losses, norm_losses, src_feature_norm, tgt_feature_norm, cls_accs],
prefix="Epoch: [{}]".format(epoch))
# switch to train mode
model.train()
end = time.time()
for i in range(args.iters_per_epoch):
x_s, labels_s = next(train_source_iter)[:2]
x_t, = next(train_target_iter)[:1]
x_s = x_s.to(device)
x_t = x_t.to(device)
labels_s = labels_s.to(device)
# measure data loading time
data_time.update(time.time() - end)
# compute output
y_s, f_s = model(x_s)
y_t, f_t = model(x_t)
# classification loss
cls_loss = F.cross_entropy(y_s, labels_s)
# norm loss
norm_loss = adaptive_feature_norm(f_s) + adaptive_feature_norm(f_t)
loss = cls_loss + norm_loss * args.trade_off_norm
# using entropy minimization
if args.trade_off_entropy:
y_t = F.softmax(y_t, dim=1)
entropy_loss = entropy(y_t, reduction='mean')
loss += entropy_loss * args.trade_off_entropy
# compute gradient and do SGD step
optimizer.zero_grad()
loss.backward()
optimizer.step()
# update statistics
cls_acc = accuracy(y_s, labels_s)[0]
cls_losses.update(cls_loss.item(), x_s.size(0))
norm_losses.update(norm_loss.item(), x_s.size(0))
src_feature_norm.update(f_s.norm(p=2, dim=1).mean().item(), x_s.size(0))
tgt_feature_norm.update(f_t.norm(p=2, dim=1).mean().item(), x_s.size(0))
cls_accs.update(cls_acc.item(), x_s.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if i % args.print_freq == 0:
progress.display(i)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='AFN for Unsupervised Domain Adaptation')
# dataset parameters
parser.add_argument('root', metavar='DIR',
help='root path of dataset')
parser.add_argument('-d', '--data', metavar='DATA', default='Office31', choices=utils.get_dataset_names(),
help='dataset: ' + ' | '.join(utils.get_dataset_names()) +
' (default: Office31)')
parser.add_argument('-s', '--source', help='source domain(s)', nargs='+')
parser.add_argument('-t', '--target', help='target domain(s)', nargs='+')
parser.add_argument('--train-resizing', type=str, default='ran.crop')
parser.add_argument('--val-resizing', type=str, default='default')
parser.add_argument('--resize-size', type=int, default=224,
help='the image size after resizing')
parser.add_argument('--no-hflip', action='store_true',
help='no random horizontal flipping during training')
parser.add_argument('--norm-mean', type=float, nargs='+',
default=(0.485, 0.456, 0.406), help='normalization mean')
parser.add_argument('--norm-std', type=float, nargs='+',
default=(0.229, 0.224, 0.225), help='normalization std')
# model parameters
parser.add_argument('-a', '--arch', metavar='ARCH', default='resnet18',
choices=utils.get_model_names(),
help='backbone architecture: ' +
' | '.join(utils.get_model_names()) +
' (default: resnet18)')
parser.add_argument('--no-pool', action='store_true',
help='no pool layer after the feature extractor.')
parser.add_argument('--scratch', action='store_true', help='whether train from scratch.')
parser.add_argument('-n', '--num-blocks', default=1, type=int, help='Number of basic blocks for classifier')
parser.add_argument('--bottleneck-dim', default=1000, type=int, help='Dimension of bottleneck')
parser.add_argument('--dropout-p', default=0.5, type=float,
help='Dropout probability')
# training parameters
parser.add_argument('-b', '--batch-size', default=32, type=int,
metavar='N',
help='mini-batch size (default: 32)')
parser.add_argument('--lr', '--learning-rate', default=0.001, type=float,
metavar='LR', help='initial learning rate', dest='lr')
parser.add_argument('--momentum', default=0.9, type=float, metavar='M',
help='momentum')
parser.add_argument('--wd', '--weight-decay', default=5e-4, type=float,
metavar='W', help='weight decay (default: 5e-4)',
dest='weight_decay')
parser.add_argument('--trade-off-norm', default=0.05, type=float,
help='the trade-off hyper-parameter for norm loss')
parser.add_argument('--trade-off-entropy', default=None, type=float,
help='the trade-off hyper-parameter for entropy loss')
parser.add_argument('-r', '--delta', default=1, type=float, help='Increment for L2 norm')
parser.add_argument('-j', '--workers', default=2, type=int, metavar='N',
help='number of data loading workers (default: 2)')
parser.add_argument('--epochs', default=20, type=int, metavar='N',
help='number of total epochs to run')
parser.add_argument('-i', '--iters-per-epoch', default=500, type=int,
help='Number of iterations per epoch')
parser.add_argument('-p', '--print-freq', default=100, type=int,
metavar='N', help='print frequency (default: 100)')
parser.add_argument('--seed', default=None, type=int,
help='seed for initializing training. ')
parser.add_argument('--per-class-eval', action='store_true',
help='whether output per-class accuracy during evaluation')
parser.add_argument("--log", type=str, default='afn',
help="Where to save logs, checkpoints and debugging images.")
parser.add_argument("--phase", type=str, default='train', choices=['train', 'test', 'analysis'],
help="When phase is 'test', only test the model."
"When phase is 'analysis', only analysis the model.")
args = parser.parse_args()
main(args)