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train.py
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train.py
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import os
import numpy as np
import torch
import torchvision
import argparse
from modules import transform, resnet, network, contrastive_loss
from util import yaml_config_hook, save_model
from torch.utils import data
import cluster
import torch.nn.functional as F
def train():
loss_epoch = 0
for step, ((x_i, x_j), _) in enumerate(data_loader):
optimizer.zero_grad()
x_i = x_i.to('cuda')
x_j = x_j.to('cuda')
z_i, z_j, c_i, c_j, h_i, bar_i, = model(x_i, x_j)
loss_instance = criterion_instance(z_i, z_j)
loss_cluster = criterion_cluster(c_i, c_j)
re_loss = F.mse_loss(bar_i,h_i)
loss = loss_instance + loss_cluster + re_loss
loss.backward()
optimizer.step()
if step % 50 == 0:
print(
f"Step [{step}/{len(data_loader)}]\t loss_instance: {loss_instance.item()}\t loss_cluster: {loss_cluster.item()}\t re_loss: {re_loss.item()}\t ")
loss_epoch += loss.item()
return loss_epoch
if __name__ == "__main__":
parser = argparse.ArgumentParser()
config = yaml_config_hook("config/config.yaml")
for k, v in config.items():
parser.add_argument(f"--{k}", default=v, type=type(v))
args = parser.parse_args()
if not os.path.exists(args.model_path):
os.makedirs(args.model_path)
torch.manual_seed(args.seed)
torch.cuda.manual_seed_all(args.seed)
torch.cuda.manual_seed(args.seed)
np.random.seed(args.seed)
# prepare data
if args.dataset == "CIFAR-10":
train_dataset = torchvision.datasets.CIFAR10(
root=args.dataset_dir,
download=True,
train=True,
transform=transform.Transforms(size=args.image_size, s=0.5),
)
test_dataset = torchvision.datasets.CIFAR10(
root=args.dataset_dir,
download=True,
train=False,
transform=transform.Transforms(size=args.image_size, s=0.5),
)
dataset = data.ConcatDataset([train_dataset, test_dataset])
class_num = 10
elif args.dataset == "CIFAR-100":
train_dataset = torchvision.datasets.CIFAR100(
root=args.dataset_dir,
download=True,
train=True,
transform=transform.Transforms(size=args.image_size, s=0.5),
)
test_dataset = torchvision.datasets.CIFAR100(
root=args.dataset_dir,
download=True,
train=False,
transform=transform.Transforms(size=args.image_size, s=0.5),
)
dataset = data.ConcatDataset([train_dataset, test_dataset])
class_num = 20
elif args.dataset == "ImageNet-10":
dataset = torchvision.datasets.ImageFolder(
root='datasets/ImageNet-10/train',
transform=transform.Transforms(size=args.image_size, blur=True),
)
class_num = 10
elif args.dataset == "ImageNet-dogs":
dataset = torchvision.datasets.ImageFolder(
root='datasets/ImageNet-dogs/train',
transform=transform.Transforms(size=args.image_size, blur=True),
)
class_num = 15
elif args.dataset == "tiny-ImageNet":
dataset = torchvision.datasets.ImageFolder(
root='datasets/tiny-imagenet-200/train',
transform=transform.Transforms(s=0.5, size=args.image_size),
)
class_num = 200
elif args.dataset == "Flowers17":
dataset = torchvision.datasets.ImageFolder(
root='datasets/Flowers17/jpg',
transform=transform.Transforms(size=args.image_size, blur=True),
)
class_num = 17
else:
raise NotImplementedError
data_loader = torch.utils.data.DataLoader(
dataset,
batch_size=args.batch_size,
shuffle=True,
drop_last=True,
num_workers=args.workers,
)
# initialize model
res = resnet.get_resnet(args.resnet)
model = network.Network(res, args.feature_dim, class_num)
model = model.to('cuda')
optimizer = torch.optim.Adam(model.parameters(), lr=args.learning_rate, weight_decay=args.weight_decay)
if args.reload:
model_fp = os.path.join(args.model_path,"checkpoint_{}.tar".format(args.start_epoch))
checkpoint = torch.load(model_fp)
model_new_dict = model.state_dict()
state_dict = {k:v for k,v in checkpoint['net'].items() if k in model_new_dict.keys()}
model_new_dict.update(state_dict)
model.load_state_dict(model_new_dict)
args.start_epoch = checkpoint['epoch'] + 1
loss_device = torch.device("cuda")
criterion_instance = contrastive_loss.InstanceLoss(args.batch_size, args.instance_temperature, loss_device).to(
loss_device)
criterion_cluster = contrastive_loss.ClusterLoss(class_num, args.cluster_temperature, loss_device).to(loss_device)
# train
for epoch in range(args.start_epoch, args.epochs):
lr = optimizer.param_groups[0]["lr"]
loss_epoch = train()
if epoch % 1 == 0:
save_model(args, model, optimizer, epoch)
print(f"Epoch [{epoch}/{args.epochs}]\t Loss: {loss_epoch / len(data_loader)}")
save_model(args, model, optimizer, args.epochs)