def main():
"""Create the model and start the training."""
h, w = map(int, args.input_size.split(','))
input_size = (h, w)
h, w = map(int, args.input_size_target.split(','))
input_size_target = (h, w)
cudnn.enabled = True
from pytorchgo.utils.pytorch_utils import set_gpu
set_gpu(args.gpu)
# Create network
if args.model == 'DeepLab':
logger.info("adopting Deeplabv2 base model..")
model = Res_Deeplab(num_classes=args.num_classes, multi_scale=False)
if args.restore_from[:4] == 'http':
saved_state_dict = model_zoo.load_url(args.restore_from)
else:
saved_state_dict = torch.load(args.restore_from)
new_params = model.state_dict().copy()
for i in saved_state_dict:
# Scale.layer5.conv2d_list.3.weight
i_parts = i.split('.')
# print i_parts
if not args.num_classes == 19 or not i_parts[1] == 'layer5':
new_params['.'.join(i_parts[1:])] = saved_state_dict[i]
# print i_parts
model.load_state_dict(new_params)
optimizer = optim.SGD(model.optim_parameters(args),
lr=args.learning_rate,
momentum=args.momentum,
weight_decay=args.weight_decay)
elif args.model == "FCN8S":
logger.info("adopting FCN8S base model..")
from pytorchgo.model.MyFCN8s import MyFCN8s
model = MyFCN8s(n_class=NUM_CLASSES)
vgg16 = torchfcn.models.VGG16(pretrained=True)
model.copy_params_from_vgg16(vgg16)
optimizer = optim.SGD(model.parameters(),
lr=args.learning_rate,
momentum=args.momentum,
weight_decay=args.weight_decay)
else:
raise ValueError
model.train()
model.cuda()
cudnn.benchmark = True
# init D
model_D1 = FCDiscriminator(num_classes=args.num_classes)
model_D2 = FCDiscriminator(num_classes=args.num_classes)
model_D1.train()
model_D1.cuda()
model_D2.train()
model_D2.cuda()
if SOURCE_DATA == "GTA5":
trainloader = data.DataLoader(GTA5DataSet(
args.data_dir,
args.data_list,
max_iters=args.num_steps * args.iter_size * args.batch_size,
crop_size=input_size,
scale=args.random_scale,
mirror=args.random_mirror,
mean=IMG_MEAN),
batch_size=args.batch_size,
shuffle=True,
num_workers=args.num_workers,
pin_memory=True)
trainloader_iter = enumerate(trainloader)
elif SOURCE_DATA == "SYNTHIA":
trainloader = data.DataLoader(SynthiaDataSet(
args.data_dir,
args.data_list,
LABEL_LIST_PATH,
max_iters=args.num_steps * args.iter_size * args.batch_size,
crop_size=input_size,
scale=args.random_scale,
mirror=args.random_mirror,
mean=IMG_MEAN),
batch_size=args.batch_size,
shuffle=True,
num_workers=args.num_workers,
pin_memory=True)
trainloader_iter = enumerate(trainloader)
else:
raise ValueError
targetloader = data.DataLoader(cityscapesDataSet(
max_iters=args.num_steps * args.iter_size * args.batch_size,
crop_size=input_size_target,
scale=False,
mirror=args.random_mirror,
mean=IMG_MEAN,
set=args.set),
batch_size=args.batch_size,
shuffle=True,
num_workers=args.num_workers,
pin_memory=True)
targetloader_iter = enumerate(targetloader)
# implement model.optim_parameters(args) to handle different models' lr setting
optimizer.zero_grad()
optimizer_D1 = optim.Adam(model_D1.parameters(),
lr=args.learning_rate_D,
betas=(0.9, 0.99))
optimizer_D1.zero_grad()
optimizer_D2 = optim.Adam(model_D2.parameters(),
lr=args.learning_rate_D,
betas=(0.9, 0.99))
optimizer_D2.zero_grad()
bce_loss = torch.nn.BCEWithLogitsLoss()
interp = nn.Upsample(size=(input_size[1], input_size[0]), mode='bilinear')
interp_target = nn.Upsample(size=(input_size_target[1],
input_size_target[0]),
mode='bilinear')
# labels for adversarial training
source_label = 0
target_label = 1
best_mIoU = 0
model_summary([model, model_D1, model_D2])
optimizer_summary([optimizer, optimizer_D1, optimizer_D2])
for i_iter in tqdm(range(args.num_steps_stop),
total=args.num_steps_stop,
desc="training"):
loss_seg_value1 = 0
loss_adv_target_value1 = 0
loss_D_value1 = 0
loss_seg_value2 = 0
loss_adv_target_value2 = 0
loss_D_value2 = 0
optimizer.zero_grad()
lr = adjust_learning_rate(optimizer, i_iter)
optimizer_D1.zero_grad()
optimizer_D2.zero_grad()
lr_D1 = adjust_learning_rate_D(optimizer_D1, i_iter)
lr_D2 = adjust_learning_rate_D(optimizer_D2, i_iter)
for sub_i in range(args.iter_size):
######################### train G
# don't accumulate grads in D
for param in model_D1.parameters():
param.requires_grad = False
for param in model_D2.parameters():
param.requires_grad = False
# train with source
_, batch = trainloader_iter.next()
images, labels, _, _ = batch
images = Variable(images).cuda()
pred2 = model(images)
pred2 = interp(pred2)
loss_seg2 = loss_calc(pred2, labels)
loss = loss_seg2
# proper normalization
loss = loss / args.iter_size
loss.backward()
loss_seg_value2 += loss_seg2.data.cpu().numpy()[0] / args.iter_size
# train with target
_, batch = targetloader_iter.next()
images, _, _, _ = batch
images = Variable(images).cuda()
pred_target2 = model(images)
pred_target2 = interp_target(pred_target2)
D_out2 = model_D2(F.softmax(pred_target2))
loss_adv_target2 = bce_loss(
D_out2,
Variable(
torch.FloatTensor(
D_out2.data.size()).fill_(source_label)).cuda())
loss = args.lambda_adv_target2 * loss_adv_target2
loss = loss / args.iter_size
loss.backward()
loss_adv_target_value2 += loss_adv_target2.data.cpu().numpy(
)[0] / args.iter_size
################################## train D
# bring back requires_grad
for param in model_D1.parameters():
param.requires_grad = True
for param in model_D2.parameters():
param.requires_grad = True
# train with source
pred2 = pred2.detach()
D_out2 = model_D2(F.softmax(pred2))
loss_D2 = bce_loss(
D_out2,
Variable(
torch.FloatTensor(
D_out2.data.size()).fill_(source_label)).cuda())
loss_D2 = loss_D2 / args.iter_size / 2
loss_D2.backward()
loss_D_value2 += loss_D2.data.cpu().numpy()[0]
# train with target
pred_target2 = pred_target2.detach()
D_out2 = model_D2(F.softmax(pred_target2))
loss_D2 = bce_loss(
D_out2,
Variable(
torch.FloatTensor(
D_out2.data.size()).fill_(target_label)).cuda())
loss_D2 = loss_D2 / args.iter_size / 2
loss_D2.backward()
loss_D_value2 += loss_D2.data.cpu().numpy()[0]
optimizer.step()
optimizer_D1.step()
optimizer_D2.step()
if i_iter % 100 == 0:
logger.info(
'iter = {}/{},loss_seg1 = {:.3f} loss_seg2 = {:.3f} loss_adv1 = {:.3f}, loss_adv2 = {:.3f} loss_D1 = {:.3f} loss_D2 = {:.3f}, lr={:.7f}, lr_D={:.7f}, best miou16= {:.5f}'
.format(i_iter, args.num_steps_stop, loss_seg_value1,
loss_seg_value2, loss_adv_target_value1,
loss_adv_target_value2, loss_D_value1, loss_D_value2,
lr, lr_D1, best_mIoU))
if i_iter % args.save_pred_every == 0 and i_iter != 0:
logger.info("saving snapshot.....")
cur_miou16 = proceed_test(model, input_size)
is_best = True if best_mIoU < cur_miou16 else False
if is_best:
best_mIoU = cur_miou16
torch.save(
{
'iteration': i_iter,
'optim_state_dict': optimizer.state_dict(),
'optim_D1_state_dict': optimizer_D1.state_dict(),
'optim_D2_state_dict': optimizer_D2.state_dict(),
'model_state_dict': model.state_dict(),
'model_D1_state_dict': model_D1.state_dict(),
'model_D2_state_dict': model_D2.state_dict(),
'best_mean_iu': cur_miou16,
}, osp.join(logger.get_logger_dir(), 'checkpoint.pth.tar'))
if is_best:
import shutil
shutil.copy(
osp.join(logger.get_logger_dir(), 'checkpoint.pth.tar'),
osp.join(logger.get_logger_dir(), 'model_best.pth.tar'))
if i_iter >= args.num_steps_stop - 1:
break
type=float,
help='Gamma update for SGD')
parser.add_argument('--visdom',
default=False,
type=str2bool,
help='Use visdom to for loss visualization')
parser.add_argument('--gpu', default=0, type=int, help='gpu')
args = parser.parse_args()
if args.cuda and torch.cuda.is_available():
torch.set_default_tensor_type('torch.cuda.FloatTensor')
else:
torch.set_default_tensor_type('torch.FloatTensor')
from pytorchgo.utils.pytorch_utils import set_gpu
set_gpu(args.gpu)
logger.info(args)
start_iter = 0
ssd_net = build_ssd('train', args.dim, num_classes)
net = ssd_net
"""
if args.cuda:
net = torch.nn.DataParallel(ssd_net)
cudnn.benchmark = True
"""
if args.resume:
logger.info('Resuming training, loading {}...'.format(args.resume))
def train(args):
logger.auto_set_dir()
from pytorchgo.utils.pytorch_utils import set_gpu
set_gpu(args.gpu)
# Setup Dataloader
from pytorchgo.augmentation.segmentation import SubtractMeans, PIL2NP, RGB2BGR, PIL_Scale, Value255to0, ToLabel
from torchvision.transforms import Compose, Normalize, ToTensor
img_transform = Compose([ # notice the order!!!
PIL_Scale(train_img_shape, Image.BILINEAR),
PIL2NP(),
RGB2BGR(),
SubtractMeans(),
ToTensor(),
])
label_transform = Compose([
PIL_Scale(train_img_shape, Image.NEAREST),
PIL2NP(),
Value255to0(),
ToLabel()
])
val_img_transform = Compose([
PIL_Scale(train_img_shape, Image.BILINEAR),
PIL2NP(),
RGB2BGR(),
SubtractMeans(),
ToTensor(),
])
val_label_transform = Compose([
PIL_Scale(train_img_shape, Image.NEAREST),
PIL2NP(),
ToLabel(),
# notice here, training, validation size difference, this is very tricky.
])
from pytorchgo.dataloader.pascal_voc_loader import pascalVOCLoader as common_voc_loader
train_loader = common_voc_loader(split="train_aug",
epoch_scale=1,
img_transform=img_transform,
label_transform=label_transform)
validation_loader = common_voc_loader(split='val',
img_transform=val_img_transform,
label_transform=val_label_transform)
n_classes = train_loader.n_classes
trainloader = data.DataLoader(train_loader,
batch_size=args.batch_size,
num_workers=8,
shuffle=True)
valloader = data.DataLoader(validation_loader,
batch_size=args.batch_size,
num_workers=8)
# Setup Metrics
running_metrics = runningScore(n_classes)
# Setup Model
from pytorchgo.model.deeplabv1 import VGG16_LargeFoV
from pytorchgo.model.deeplab_resnet import Res_Deeplab
model = Res_Deeplab(NoLabels=n_classes, pretrained=True, output_all=False)
from pytorchgo.utils.pytorch_utils import model_summary, optimizer_summary
model_summary(model)
def get_validation_miou(model):
model.eval()
for i_val, (images_val, labels_val) in tqdm(enumerate(valloader),
total=len(valloader),
desc="validation"):
if i_val > 5 and is_debug == 1: break
if i_val > 200 and is_debug == 2: break
#img_large = torch.Tensor(np.zeros((1, 3, 513, 513)))
#img_large[:, :, :images_val.shape[2], :images_val.shape[3]] = images_val
output = model(Variable(images_val, volatile=True).cuda())
output = output
pred = output.data.max(1)[1].cpu().numpy()
#pred = output[:, :images_val.shape[2], :images_val.shape[3]]
gt = labels_val.numpy()
running_metrics.update(gt, pred)
score, class_iou = running_metrics.get_scores()
for k, v in score.items():
logger.info("{}: {}".format(k, v))
running_metrics.reset()
return score['Mean IoU : \t']
model.cuda()
# Check if model has custom optimizer / loss
if hasattr(model, 'optimizer'):
logger.warn("don't have customzed optimizer, use default setting!")
optimizer = model.module.optimizer
else:
optimizer = torch.optim.SGD(model.optimizer_params(args.l_rate),
lr=args.l_rate,
momentum=0.99,
weight_decay=5e-4)
optimizer_summary(optimizer)
if args.resume is not None:
if os.path.isfile(args.resume):
logger.info(
"Loading model and optimizer from checkpoint '{}'".format(
args.resume))
checkpoint = torch.load(args.resume)
model.load_state_dict(checkpoint['model_state'])
optimizer.load_state_dict(checkpoint['optimizer_state'])
logger.info("Loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
logger.info("No checkpoint found at '{}'".format(args.resume))
best_iou = 0
logger.info('start!!')
for epoch in tqdm(range(args.n_epoch), total=args.n_epoch):
model.train()
for i, (images, labels) in tqdm(enumerate(trainloader),
total=len(trainloader),
desc="training epoch {}/{}".format(
epoch, args.n_epoch)):
if i > 10 and is_debug == 1: break
if i > 200 and is_debug == 2: break
cur_iter = i + epoch * len(trainloader)
cur_lr = adjust_learning_rate(optimizer,
args.l_rate,
cur_iter,
args.n_epoch * len(trainloader),
power=0.9)
images = Variable(images.cuda())
labels = Variable(labels.cuda())
optimizer.zero_grad()
outputs = model(images) # use fusion score
loss = CrossEntropyLoss2d_Seg(input=outputs,
target=labels,
class_num=n_classes)
#for i in range(len(outputs) - 1):
#for i in range(1):
# loss = loss + CrossEntropyLoss2d_Seg(input=outputs[i], target=labels, class_num=n_classes)
loss.backward()
optimizer.step()
if (i + 1) % 100 == 0:
logger.info(
"Epoch [%d/%d] Loss: %.4f, lr: %.7f, best mIoU: %.7f" %
(epoch + 1, args.n_epoch, loss.data[0], cur_lr, best_iou))
cur_miou = get_validation_miou(model)
if cur_miou >= best_iou:
best_iou = cur_miou
state = {
'epoch': epoch + 1,
'mIoU': best_iou,
'model_state': model.state_dict(),
'optimizer_state': optimizer.state_dict(),
}
torch.save(state,
os.path.join(logger.get_logger_dir(), "best_model.pth"))
parser.add_argument('--cuda',
default=True,
type=str2bool,
help='Use cuda to train model')
parser.add_argument('--voc_root',
default=Sim_ROOT,
help='Location of VOC root directory')
parser.add_argument('--cleanup',
default=True,
type=str2bool,
help='Cleanup and remove results files following eval')
args = parser.parse_args()
from pytorchgo.utils.pytorch_utils import set_gpu
set_gpu(2)
if not os.path.exists(args.save_folder):
os.mkdir(args.save_folder)
if torch.cuda.is_available():
if args.cuda:
torch.set_default_tensor_type('torch.cuda.FloatTensor')
if not args.cuda:
print(
"WARNING: It looks like you have a CUDA device, but aren't using \
CUDA. Run with --cuda for optimal eval speed.")
torch.set_default_tensor_type('torch.FloatTensor')
else:
torch.set_default_tensor_type('torch.FloatTensor')