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train_stacked2d.py
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train_stacked2d.py
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from model2d.stacked_unet2d import StackedUnet2D
from src.utils import *
from data_loader.brats15_2d import Brats15DataLoader
from torch.utils.data import DataLoader
from torch.autograd import Variable
import sys
import torch
import torch.nn as nn
import torch.optim as optim
import torch.nn.functional as F
# ********** Hyper Parameter **********
data_dir = '/home/haoyum/download/BRATS2015_Training'
conf_train = 'config/train15.conf'
conf_test = 'config/test15.conf'
learning_rate = 0.001
batch_size = 32
epochs = 40
save_dir = 'ckpt_'
device_ids = [0, 1, 2, 3] # multi-GPU
cuda_available = torch.cuda.is_available()
model = 'sunet'
if not os.path.exists(save_dir + model + '/'):
os.mkdir(save_dir + model + '/')
# ******************** build model ********************
net = StackedUnet2D(in_ch=1, out_ch=2, degree=32)
if cuda_available:
net = net.cuda()
net = nn.DataParallel(net, device_ids=device_ids)
# ******************** log file ********************
log_train = open(model + '_log_train.txt', 'w')
log_test = open(model + '_log_test.txt', 'w')
log_train_dice = open(model + '_log_train_dice.txt', 'w')
log_test_dice = open(model + '_log_test_dice.txt', 'w')
# ******************** data preparation ********************
print 'train data ....'
train_data = Brats15DataLoader(data_dir=data_dir, task_type='wt', conf=conf_train, is_train=True)
print 'test data .....'
test_data = Brats15DataLoader(data_dir=data_dir, task_type='wt', conf=conf_test, is_train=False)
# data loader
train_dataset = DataLoader(dataset=train_data, batch_size=batch_size, shuffle=True)
test_dataset = DataLoader(dataset=test_data, batch_size=batch_size, shuffle=True)
def run():
optimizer = optim.Adam(params=net.parameters(), lr=learning_rate, betas=(0.9, 0.999))
criterion = nn.CrossEntropyLoss()
for epoch in range(1, epochs + 1):
print ('epoch....................................' + str(epoch))
train_loss = []
test_loss = []
train_dice = []
test_dice = []
# *************** train model ***************
print 'train ....'
net.train()
for step, (image, label, index) in enumerate(train_dataset):
image = Variable(image.cuda() if cuda_available else image)
# 4D tensor Batch_Size * 4(modal) * 192 * 192
label = Variable(label.cuda() if cuda_available else image)
# 4D tensor Batch_Size * 1 * 192 * 192
optimizer.zero_grad()
predicts = net(image) # 5D tensor Batch_Size * 4 * 2 * H * W
# ****** calculate loss ******
loss_train = 0
for k in range(4):
loss_train += criterion(predicts[:, k, :, :, :], label[:, 0, :, :].long())
train_loss.append(float(loss_train))
loss_train.backward()
optimizer.step()
# ****** calculate dice ******
predicts = F.softmax(predicts[:, 3, :, :, :], dim=1)
# 4D float Tensor Batch_Size * 2 * height * weight
predicts = (predicts[:, 1, :, :] > 0.5).long()
# 3D Long Tensor Batch_Size * height * weight
d = dice(predicts, label[:, 0, :, :].long())
train_dice.append(d)
# ****** save sample image for each epoch ******
if step == 0:
save_train_images(image, predicts, label[:, 0, :, :], index, epoch, save_dir=save_dir + model + '/')
# ***************** calculate test loss *****************
print 'test ....'
net.eval()
for step, (image, label, subject) in enumerate(test_dataset):
image = Variable(image.cuda() if cuda_available else image)
# 4D tensor Batch_Size * 4(modal) * 192 * 192
label = Variable(label.cuda() if cuda_available else image)
# 4D tensor Batch_Size * 1 * 192 * 192
predicts = net(image) # 5D tensor Batch_Size * 4 * 2 * H * W
# ****** calculate loss ******
loss_test = 0
for k in range(4):
loss_test += criterion(predicts[:, k, :, :, :], label[:, 0, :, :].long())
test_loss.append(float(loss_test))
# ****** calculate dice ******
predicts = F.softmax(predicts[:, 3, :, :, :], dim=1)
# 4D float Tensor Batch_Size * 2 * height * weight
predicts = (predicts[:, 1, :, :] > 0.5).long()
# 3D Long Tensor Batch_Size * height * weight
d = dice(predicts, label[:, 0, :, :].long())
test_dice.append(d)
# **************** save loss for one batch ****************
print 'train_loss ' + str(sum(train_loss) / (len(train_loss) * 1.0))
print 'test_loss ' + str(sum(test_loss) / (len(test_loss) * 1.0))
print 'train_dice ' + str(sum(train_dice) / (len(train_dice) * 1.0))
print 'test_dice ' + str(sum(test_dice) / (len(test_dice) * 1.0))
log_train.write(str(sum(train_loss)/(len(train_loss) * 1.0)) + '\n')
log_train_dice.write(str(sum(train_dice) / (len(train_dice) * 1.0)) + '\n')
log_test.write(str(sum(test_loss) / (len(test_loss) * 1.0)) + '\n')
log_test_dice.write(str(sum(test_dice) / (len(test_dice) * 1.0)) + '\n')
# **************** save model ****************
if epoch % 10 == 0:
torch.save(net.state_dict(),
os.path.join(save_dir + model + '/', 'epoch_{:d}.pth'.format(epoch)))
print '***********************************************************'
print ('done!')
if __name__ == '__main__':
run()
log_train.close()
log_test.close()
log_train_dice.close()
log_test_dice.close()