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import os
import random
import torch
from torch import nn, Tensor, optim
from torch.nn import CrossEntropyLoss
from torch.utils.data import DataLoader
from torch.utils.tensorboard import SummaryWriter
from torchvision.datasets import CIFAR10
from torchvision.models import ResNet
from torchvision.models.resnet import BasicBlock
from torchvision.transforms import transforms, InterpolationMode
from tqdm import tqdm
from lars_optimizer import LARS
from scheduler import LinearWarmupAndCosineAnneal
CODENAME = 'cifar10-resnet50-aug-lars-sched'
DATASET_ROOT = 'dataset'
TENSORBOARD_PATH = os.path.join('runs', CODENAME)
CHECKPOINT_PATH = os.path.join('checkpoints', CODENAME)
BATCH_SIZE = 256
N_EPOCHS = 1000
WARMUP_EPOCHS = 10
N_WORKERS = 2
LR = 1
MOMENTUM = 0.9
WEIGHT_DECAY = 1e-6
SEED = 0
if not os.path.exists(CHECKPOINT_PATH):
os.makedirs(CHECKPOINT_PATH)
random.seed(SEED)
torch.manual_seed(SEED)
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
class CIFAR10ResNet50(ResNet):
def __init__(self):
super(CIFAR10ResNet50, self).__init__(
block=BasicBlock, layers=[3, 4, 6, 3], num_classes=10
)
self.conv1 = nn.Conv2d(3, 64, kernel_size=3,
stride=1, padding=1, bias=False)
def forward(self, x: Tensor) -> Tensor:
x = self.conv1(x)
x = self.bn1(x)
x = self.relu(x)
x = self.layer1(x)
x = self.layer2(x)
x = self.layer3(x)
x = self.layer4(x)
x = self.avgpool(x)
x = torch.flatten(x, 1)
x = self.fc(x)
return x
def get_color_distortion(s=1.0):
# s is the strength of color distortion.
color_jitter = transforms.ColorJitter(0.8 * s, 0.8 * s, 0.8 * s, 0.2 * s)
rnd_color_jitter = transforms.RandomApply([color_jitter], p=0.8)
rnd_gray = transforms.RandomGrayscale(p=0.2)
color_distort = transforms.Compose([
rnd_color_jitter,
rnd_gray
])
return color_distort
train_transform = transforms.Compose([
transforms.RandomResizedCrop(32, interpolation=InterpolationMode.BICUBIC),
transforms.RandomHorizontalFlip(0.5),
get_color_distortion(0.5),
transforms.ToTensor()
])
test_transform = transforms.Compose([
transforms.ToTensor()
])
train_set = CIFAR10(DATASET_ROOT, train=True, transform=train_transform,
download=True)
test_set = CIFAR10(DATASET_ROOT, train=False, transform=test_transform)
train_loader = DataLoader(train_set, batch_size=BATCH_SIZE,
shuffle=True, num_workers=N_WORKERS)
test_loader = DataLoader(test_set, batch_size=BATCH_SIZE,
shuffle=False, num_workers=N_WORKERS)
num_train_batches = len(train_loader)
num_test_batches = len(test_loader)
resnet = CIFAR10ResNet50().to(device)
criterion = CrossEntropyLoss()
def exclude_from_wd_and_adaptation(name):
if 'bn' in name or 'bias' in name:
return True
param_groups = [
{
'params': [p for name, p in resnet.named_parameters()
if not exclude_from_wd_and_adaptation(name)],
'weight_decay': WEIGHT_DECAY,
'layer_adaptation': True,
},
{
'params': [p for name, p in resnet.named_parameters()
if exclude_from_wd_and_adaptation(name)],
'weight_decay': 0.,
'layer_adaptation': False,
},
]
optimizer = torch.optim.SGD(param_groups, lr=LR, momentum=MOMENTUM)
scheduler = LinearWarmupAndCosineAnneal(
optimizer,
WARMUP_EPOCHS / N_EPOCHS,
N_EPOCHS * num_train_batches,
last_epoch=-1,
)
optimizer = LARS(optimizer)
writer = SummaryWriter(TENSORBOARD_PATH)
train_iters = 0
test_iters = 0
for epoch in range(N_EPOCHS):
train_loss = 0
training_progress = tqdm(
enumerate(train_loader), desc='Train loss: ', total=num_train_batches
)
resnet.train()
for batch, (images, targets) in training_progress:
images, targets = images.to(device), targets.to(device)
resnet.zero_grad()
output = resnet(images)
loss = criterion(output, targets)
loss.backward()
optimizer.step()
scheduler.step()
train_loss += loss.item()
train_loss_mean = train_loss / (batch + 1)
training_progress.set_description(f'Train loss: {train_loss_mean:.4f}')
writer.add_scalar('Loss/train', loss, train_iters + 1)
train_iters += 1
test_loss = 0
test_acc = 0
test_progress = tqdm(
enumerate(test_loader), desc='Test loss: ', total=num_test_batches
)
resnet.eval()
with torch.no_grad():
for batch, (images, targets) in test_progress:
images, targets = images.to(device), targets.to(device)
output = resnet(images)
loss = criterion(output, targets)
_, prediction = output.max(-1)
test_loss += loss
test_loss_mean = test_loss / (batch + 1)
test_progress.set_description(f'Test loss: {test_loss_mean:.4f}')
test_acc += (prediction == targets).float().mean()
test_acc_mean = test_acc / (batch + 1)
writer.add_scalar('Loss/test', loss, test_iters + 1)
test_iters += 1
train_loss_mean = train_loss / num_train_batches
test_loss_mean = test_loss / num_test_batches
test_acc_mean = test_acc / num_test_batches
print(f'[{epoch + 1}/{N_EPOCHS}]\t'
f'Train loss: {train_loss_mean:.4f}\t'
f'Test loss: {test_loss_mean:.4f}\t',
f'Test acc: {test_acc_mean:.4f}')
writer.add_scalar('Acc', test_acc_mean, epoch + 1)
torch.save({'epoch': epoch,
'resnet_state_dict': resnet.state_dict(),
'optimizer_state_dict': optimizer.state_dict(),
'train_loss': train_loss_mean, 'test_loss': test_loss_mean,
}, os.path.join(CHECKPOINT_PATH, f'{epoch + 1:04d}.pt'))
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