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train_trades_cifar10.py
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train_trades_cifar10.py
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from __future__ import print_function
import os
import argparse
import torch
import torch.nn as nn
import torch.nn.functional as F
import torchvision
import torch.optim as optim
from torchvision import datasets, transforms
from models.wideresnet import *
from models.resnet import *
from trades import trades_loss
parser = argparse.ArgumentParser(description='PyTorch CIFAR TRADES Adversarial Training')
parser.add_argument('--batch-size', type=int, default=128, metavar='N',
help='input batch size for training (default: 128)')
parser.add_argument('--test-batch-size', type=int, default=128, metavar='N',
help='input batch size for testing (default: 128)')
parser.add_argument('--epochs', type=int, default=76, metavar='N',
help='number of epochs to train')
parser.add_argument('--weight-decay', '--wd', default=2e-4,
type=float, metavar='W')
parser.add_argument('--lr', type=float, default=0.1, metavar='LR',
help='learning rate')
parser.add_argument('--momentum', type=float, default=0.9, metavar='M',
help='SGD momentum')
parser.add_argument('--no-cuda', action='store_true', default=False,
help='disables CUDA training')
parser.add_argument('--epsilon', default=0.031,
help='perturbation')
parser.add_argument('--num-steps', default=10,
help='perturb number of steps')
parser.add_argument('--step-size', default=0.007,
help='perturb step size')
parser.add_argument('--beta', default=6.0,
help='regularization, i.e., 1/lambda in TRADES')
parser.add_argument('--seed', type=int, default=1, metavar='S',
help='random seed (default: 1)')
parser.add_argument('--log-interval', type=int, default=100, metavar='N',
help='how many batches to wait before logging training status')
parser.add_argument('--model-dir', default='./model-cifar-wideResNet',
help='directory of model for saving checkpoint')
parser.add_argument('--save-freq', '-s', default=1, type=int, metavar='N',
help='save frequency')
args = parser.parse_args()
# settings
model_dir = args.model_dir
if not os.path.exists(model_dir):
os.makedirs(model_dir)
use_cuda = not args.no_cuda and torch.cuda.is_available()
torch.manual_seed(args.seed)
device = torch.device("cuda" if use_cuda else "cpu")
kwargs = {'num_workers': 1, 'pin_memory': True} if use_cuda else {}
# setup data loader
transform_train = transforms.Compose([
transforms.RandomCrop(32, padding=4),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
])
transform_test = transforms.Compose([
transforms.ToTensor(),
])
trainset = torchvision.datasets.CIFAR10(root='../data', train=True, download=True, transform=transform_train)
train_loader = torch.utils.data.DataLoader(trainset, batch_size=args.batch_size, shuffle=True, **kwargs)
testset = torchvision.datasets.CIFAR10(root='../data', train=False, download=True, transform=transform_test)
test_loader = torch.utils.data.DataLoader(testset, batch_size=args.test_batch_size, shuffle=False, **kwargs)
def train(args, model, device, train_loader, optimizer, epoch):
model.train()
for batch_idx, (data, target) in enumerate(train_loader):
data, target = data.to(device), target.to(device)
optimizer.zero_grad()
# calculate robust loss
loss = trades_loss(model=model,
x_natural=data,
y=target,
optimizer=optimizer,
step_size=args.step_size,
epsilon=args.epsilon,
perturb_steps=args.num_steps,
beta=args.beta)
loss.backward()
optimizer.step()
# print progress
if batch_idx % args.log_interval == 0:
print('Train Epoch: {} [{}/{} ({:.0f}%)]\tLoss: {:.6f}'.format(
epoch, batch_idx * len(data), len(train_loader.dataset),
100. * batch_idx / len(train_loader), loss.item()))
def eval_train(model, device, train_loader):
model.eval()
train_loss = 0
correct = 0
with torch.no_grad():
for data, target in train_loader:
data, target = data.to(device), target.to(device)
output = model(data)
train_loss += F.cross_entropy(output, target, size_average=False).item()
pred = output.max(1, keepdim=True)[1]
correct += pred.eq(target.view_as(pred)).sum().item()
train_loss /= len(train_loader.dataset)
print('Training: Average loss: {:.4f}, Accuracy: {}/{} ({:.0f}%)'.format(
train_loss, correct, len(train_loader.dataset),
100. * correct / len(train_loader.dataset)))
training_accuracy = correct / len(train_loader.dataset)
return train_loss, training_accuracy
def eval_test(model, device, test_loader):
model.eval()
test_loss = 0
correct = 0
with torch.no_grad():
for data, target in test_loader:
data, target = data.to(device), target.to(device)
output = model(data)
test_loss += F.cross_entropy(output, target, size_average=False).item()
pred = output.max(1, keepdim=True)[1]
correct += pred.eq(target.view_as(pred)).sum().item()
test_loss /= len(test_loader.dataset)
print('Test: Average loss: {:.4f}, Accuracy: {}/{} ({:.0f}%)'.format(
test_loss, correct, len(test_loader.dataset),
100. * correct / len(test_loader.dataset)))
test_accuracy = correct / len(test_loader.dataset)
return test_loss, test_accuracy
def adjust_learning_rate(optimizer, epoch):
"""decrease the learning rate"""
lr = args.lr
if epoch >= 75:
lr = args.lr * 0.1
if epoch >= 90:
lr = args.lr * 0.01
if epoch >= 100:
lr = args.lr * 0.001
for param_group in optimizer.param_groups:
param_group['lr'] = lr
def main():
# init model, ResNet18() can be also used here for training
model = WideResNet().to(device)
optimizer = optim.SGD(model.parameters(), lr=args.lr, momentum=args.momentum, weight_decay=args.weight_decay)
for epoch in range(1, args.epochs + 1):
# adjust learning rate for SGD
adjust_learning_rate(optimizer, epoch)
# adversarial training
train(args, model, device, train_loader, optimizer, epoch)
# evaluation on natural examples
print('================================================================')
eval_train(model, device, train_loader)
eval_test(model, device, test_loader)
print('================================================================')
# save checkpoint
if epoch % args.save_freq == 0:
torch.save(model.state_dict(),
os.path.join(model_dir, 'model-wideres-epoch{}.pt'.format(epoch)))
torch.save(optimizer.state_dict(),
os.path.join(model_dir, 'opt-wideres-checkpoint_epoch{}.tar'.format(epoch)))
if __name__ == '__main__':
main()