def train(epoch, optim, net, criteria, lr_schdr):
## dataset
dl = get_data_loader(cfg.im_root,
cfg.train_im_anns,
cfg.ims_per_gpu,
cfg.scales,
cfg.cropsize,
mode='train')
## meters
time_meter, loss_meter = set_meters(epoch)
## train loop
for it, (im, lb) in enumerate(tqdm(dl)):
im = im.cuda()
lb = lb.cuda()
lb = torch.squeeze(lb, 1)
optim.zero_grad()
aux_loss, main_loss = net(im)
aux_criteria = criteria(aux_loss, lb)
main_criteria = criteria(main_loss, lb)
loss = main_criteria + 0.1 * aux_criteria
'''if has_apex:
with amp.scale_loss(loss, optim) as scaled_loss:
scaled_loss.backward()
else:'''
loss = loss.mean()
loss.backward()
optim.step()
time_meter.update()
loss_meter.update(loss.item())
lr_schdr.step()
return lr_schdr, time_meter, loss_meter
def eval_model(net, ims_per_gpu, im_root, im_anns, n_classes, cropsize):
dl = get_data_loader(im_root,
im_anns,
ims_per_gpu,
None,
None,
mode='test',
distributed=False)
net.eval()
heads, mious = [], []
logger = logging.getLogger()
'''
single_scale = MscEvalV0((1., ), False)
mIOU = single_scale(net, dl, n_classes)
heads.append('single_scale')
mious.append(mIOU)
logger.info('single mIOU is: %s\n', mIOU)
single_crop = MscEvalCrop(
cropsize=1024,
cropstride=2. / 3,
flip=False,
scales=(1., ),
lb_ignore=255,
)
mIOU = single_crop(net, dl, n_classes)
heads.append('single_scale_crop')
mious.append(mIOU)
logger.info('single scale crop mIOU is: %s\n', mIOU)
ms_flip = MscEvalV0((0.5, 0.75, 1, 1.25, 1.5, 1.75), True)
mIOU = ms_flip(net, dl, n_classes)
heads.append('ms_flip')
mious.append(mIOU)
logger.info('ms flip mIOU is: %s\n', mIOU)
ms_flip_crop = MscEvalCrop(
cropsize=1024,
cropstride=2. / 3,
flip=True,
scales=(0.5, 0.75, 1.0, 1.25, 1.5, 1.75),
lb_ignore=255,
)
mIOU = ms_flip_crop(net, dl, n_classes)
heads.append('ms_flip_crop')
mious.append(mIOU)
logger.info('ms crop mIOU is: %s\n', mIOU)
'''
windowEval = WindowEval(cropsize=cropsize,
cropstride=2. / 3,
lb_ignore=255)
mIOU = windowEval(net, dl, n_classes)
heads.append('window eval')
mious.append(mIOU)
logger.info('ms crop mIOU is: %s\n', mIOU)
return heads, mious
def eval_model(net, ims_per_gpu, im_root, im_anns, it=cfg.epoch):
dl = get_data_loader(im_root, im_anns, ims_per_gpu, None, None, mode='val')
net.eval()
heads, mious = [], []
logger = logging.getLogger()
if (it + 1) != cfg.epoch:
single_scale = MscEvalV0((1., ), False)
mIOU = single_scale(net, dl, 19)
heads.append('single_scale')
mious.append(mIOU)
logger.info('single mIOU is: %s\n', mIOU)
return heads, mious, mIOU
single_scale = MscEvalV0((1., ), False)
mIOUss = single_scale(net, dl, 19)
heads.append('single_scale')
mious.append(mIOUss)
logger.info('single mIOU is: %s\n', mIOUss)
single_crop = MscEvalCrop(
cropsize=1024,
cropstride=2. / 3,
flip=False,
scales=(1., ),
lb_ignore=255,
)
'''mIOU = single_crop(net, dl, 19)
heads.append('single_scale_crop')
mious.append(mIOU)
logger.info('single scale crop mIOU is: %s\n', mIOU)
ms_flip = MscEvalV0((0.5, 0.75, 1, 1.25, 1.5, 1.75), True)
mIOU = ms_flip(net, dl, 19)
heads.append('ms_flip')
mious.append(mIOU)
logger.info('ms flip mIOU is: %s\n', mIOU)
ms_flip_crop = MscEvalCrop(
cropsize=1024,
cropstride=2. / 3,
flip=True,
scales=(0.5, 0.75, 1.0, 1.25, 1.5, 1.75),
lb_ignore=255,
)
mIOU = ms_flip_crop(net, dl, 19)
heads.append('ms_flip_crop')
mious.append(mIOU)
logger.info('ms crop mIOU is: %s\n', mIOU)'''
return heads, mious, mIOUss
def eval_model(net, ims_per_gpu, im_root, im_anns):
is_dist = dist.is_initialized()
dl = get_data_loader(im_root,
im_anns,
ims_per_gpu,
None,
None,
mode='val',
distributed=is_dist)
net.eval()
heads, mious = [], []
logger = logging.getLogger()
single_scale = MscEvalV0((1., ), False)
mIOU = single_scale(net, dl, 19)
heads.append('single_scale')
mious.append(mIOU)
logger.info('single mIOU is: %s\n', mIOU)
single_crop = MscEvalCrop(
cropsize=1024,
cropstride=2. / 3,
flip=False,
scales=(1., ),
lb_ignore=255,
)
mIOU = single_crop(net, dl, 19)
heads.append('single_scale_crop')
mious.append(mIOU)
logger.info('single scale crop mIOU is: %s\n', mIOU)
ms_flip = MscEvalV0((0.5, 0.75, 1, 1.25, 1.5, 1.75), True)
mIOU = ms_flip(net, dl, 19)
heads.append('ms_flip')
mious.append(mIOU)
logger.info('ms flip mIOU is: %s\n', mIOU)
ms_flip_crop = MscEvalCrop(
cropsize=1024,
cropstride=2. / 3,
flip=True,
scales=(0.5, 0.75, 1.0, 1.25, 1.5, 1.75),
lb_ignore=255,
)
mIOU = ms_flip_crop(net, dl, 19)
heads.append('ms_flip_crop')
mious.append(mIOU)
logger.info('ms crop mIOU is: %s\n', mIOU)
return heads, mious
def eval_model(net, ims_per_gpu, im_root, im_anns,iteration):
is_dist = dist.is_initialized()
dl = get_data_loader(im_root, im_anns, ims_per_gpu, None,
None, mode='val', distributed=is_dist)
net.eval()
heads, mious = [], []
logger = logging.getLogger()
single_scale = MscEvalV0((1., ), False)
mIOU = single_scale(net, dl,19,iteration,dist.get_rank() == 0)
heads.append('single_scale')
mious.append(mIOU)
logger.info('single mIOU is: %s\n', mIOU)
return heads, mious
def train():
logger = logging.getLogger()
is_dist = dist.is_initialized()
## dataset
dl = get_data_loader(cfg.im_root,
cfg.train_im_anns,
cfg.ims_per_gpu,
cfg.scales,
cfg.cropsize,
cfg.max_iter,
mode='train',
distributed=is_dist)
## model
net, criteria_pre, criteria_aux = set_model()
## optimizer
optim = set_optimizer(net)
## fp16
if has_apex:
opt_level = 'O1' if cfg.use_fp16 else 'O0'
net, optim = amp.initialize(net, optim, opt_level=opt_level)
## ddp training
net = set_model_dist(net)
## meters
time_meter, loss_meter, loss_pre_meter, loss_aux_meters = set_meters()
## lr scheduler
lr_schdr = WarmupPolyLrScheduler(
optim,
power=0.9,
max_iter=cfg.max_iter,
warmup_iter=cfg.warmup_iters,
warmup_ratio=0.1,
warmup='exp',
last_epoch=-1,
)
## train loop
for it, (im, lb) in enumerate(dl):
im = im.cuda()
lb = lb.cuda()
lb = torch.squeeze(lb, 1)
optim.zero_grad()
logits, *logits_aux = net(im)
loss_pre = criteria_pre(logits, lb)
loss_aux = [
crit(lgt, lb) for crit, lgt in zip(criteria_aux, logits_aux)
]
loss = loss_pre + sum(loss_aux)
if has_apex:
with amp.scale_loss(loss, optim) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
optim.step()
torch.cuda.synchronize()
lr_schdr.step()
time_meter.update()
loss_meter.update(loss.item())
loss_pre_meter.update(loss_pre.item())
_ = [
mter.update(lss.item())
for mter, lss in zip(loss_aux_meters, loss_aux)
]
## print training log message
if (it + 1) % 100 == 0:
lr = lr_schdr.get_lr()
lr = sum(lr) / len(lr)
print_log_msg(it, cfg.max_iter, lr, time_meter, loss_meter,
loss_pre_meter, loss_aux_meters)
if (it) % 1000 == 0:
save_checkpoint('bisenet_citys_{}.pth'.format(it),
net.module.state_dict())
## dump the final model and evaluate the result
save_pth = osp.join(cfg.respth, 'model_final.pth')
logger.info('\nsave models to {}'.format(save_pth))
state = net.module.state_dict()
if dist.get_rank() == 0: torch.save(state, save_pth)
logger.info('\nevaluating the final model')
torch.cuda.empty_cache()
heads, mious = eval_model(net, 2, cfg.im_root, cfg.val_im_anns)
logger.info(tabulate([
mious,
], headers=heads, tablefmt='orgtbl'))
return
def train():
logger = logging.getLogger()
is_dist = dist.is_initialized()
## dataset
dl = get_data_loader(cfg.im_root,
cfg.train_im_anns,
cfg.ims_per_gpu,
cfg.scales,
cfg.cropsize,
cfg.max_iter,
mode='train',
distributed=is_dist)
## model
net, criteria_pre, criteria_aux = set_model()
## optimizer
optim = set_optimizer(net)
## fp16
if has_apex:
opt_level = 'O1' if cfg.use_fp16 else 'O0'
net, optim = amp.initialize(net, optim, opt_level=opt_level)
## ddp training
net = set_model_dist(net)
## meters
time_meter, loss_meter, loss_pre_meter, loss_aux_meters = set_meters()
## lr scheduler
lr_schdr = WarmupPolyLrScheduler(
optim,
power=0.9,
max_iter=cfg.max_iter,
warmup_iter=cfg.warmup_iters,
warmup_ratio=0.1,
warmup='exp',
last_epoch=-1,
)
##load checkpoin if exits for resuming training
if args.loadCheckpointLocation != None:
net, optim, lr_schdr, start_iteration = load_ckp(
args.loadCheckpointLocation, net, optim, lr_schdr)
else:
start_iteration = 0
## train loop
for current_it, (im, lb) in enumerate(dl):
#on resumed training 'it' will be incremented from what was left else the sum is 0 anyways
it = current_it + start_iteration
im = im.cuda()
lb = lb.cuda()
lb = torch.squeeze(lb, 1)
optim.zero_grad()
logits, *logits_aux = net(im)
loss_pre = criteria_pre(logits, lb)
loss_aux = [
crit(lgt, lb) for crit, lgt in zip(criteria_aux, logits_aux)
]
loss = loss_pre + sum(loss_aux)
if has_apex:
with amp.scale_loss(loss, optim) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
optim.step()
torch.cuda.synchronize()
lr_schdr.step()
time_meter.update()
loss_meter.update(loss.item())
loss_pre_meter.update(loss_pre.item())
_ = [
mter.update(lss.item())
for mter, lss in zip(loss_aux_meters, loss_aux)
]
## print training log message
if (it + 1) % 100 == 0:
lr = lr_schdr.get_lr()
lr = sum(lr) / len(lr)
print_log_msg(it, cfg.max_iter, lr, time_meter, loss_meter,
loss_pre_meter, loss_aux_meters)
#save the checkpoint on every some iteration
if (it + 1) % args.saveOnEveryIt == 0:
if args.saveCheckpointDir != None:
checkpoint = {
'iteration': it + 1,
'state_dict': net.state_dict(),
'optimizer': optim.state_dict(),
'lr_schdr': lr_schdr.state_dict(),
}
iteration_no_str = (str(it + 1)).zfill(len(str(cfg.max_iter)))
ckt_name = 'checkpoint_it_' + iteration_no_str + '.pt'
save_pth = osp.join(args.saveCheckpointDir, ckt_name)
logger.info(
'\nsaving intermidiate checkpoint to {}'.format(save_pth))
save_ckp(checkpoint, save_pth)
## dump the final model and evaluate the result
checkpoint = {
'iteration': cfg.max_iter,
'state_dict': net.state_dict(),
'optimizer': optim.state_dict(),
'lr_schdr': lr_schdr.state_dict(),
}
save_pth = osp.join(args.saveCheckpointDir, 'model_final.pt')
logger.info('\nsave Final models to {}'.format(save_pth))
save_ckp(checkpoint, save_pth)
logger.info('\nevaluating the final model')
torch.cuda.empty_cache()
heads, mious = eval_model(net, 2, cfg.im_root, cfg.val_im_anns)
logger.info(tabulate([
mious,
], headers=heads, tablefmt='orgtbl'))
return
def train():
logger = logging.getLogger()
is_dist = False
## dataset
dl = get_data_loader(
cfg.im_root, cfg.train_im_anns,
cfg.ims_per_gpu, cfg.scales, cfg.cropsize,
cfg.max_iter, mode='train', distributed=is_dist)
valid = get_data_loader(
cfg.im_root, cfg.val_im_anns,
cfg.ims_per_gpu, cfg.scales, cfg.cropsize,
cfg.max_iter, mode='val', distributed=is_dist
)
## model
net, criteria_pre, criteria_aux = set_model()
print(net)
print(f'n_parameters: {sum(p.numel() for p in net.parameters())}')
## optimizer
optim = set_optimizer(net)
## fp16
if has_apex:
opt_level = 'O1' if cfg.use_fp16 else 'O0'
net, optim = amp.initialize(net, optim, opt_level=opt_level)
## meters
time_meter, loss_meter, loss_pre_meter, loss_aux_meters = set_meters()
## lr scheduler
lr_schdr = WarmupPolyLrScheduler(optim, power=0.9,
max_iter=cfg.max_iter, warmup_iter=cfg.warmup_iters,
warmup_ratio=0.1, warmup='exp', last_epoch=-1,)
best_validation = np.inf
for i in range(cfg.n_epochs):
## train loop
for it, (im, lb) in enumerate(Bar(dl)):
net.train()
im = im.cuda()
lb = lb.cuda()
lb = torch.squeeze(lb, 1)
optim.zero_grad()
logits, *logits_aux = net(im)
loss_pre = criteria_pre(logits, lb)
loss_aux = [crit(lgt, lb) for crit, lgt in zip(criteria_aux, logits_aux)]
loss = loss_pre + sum(loss_aux)
if has_apex:
with amp.scale_loss(loss, optim) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
optim.step()
torch.cuda.synchronize()
lr_schdr.step()
time_meter.update()
loss_meter.update(loss.item())
loss_pre_meter.update(loss_pre.item())
_ = [mter.update(lss.item()) for mter, lss in zip(loss_aux_meters, loss_aux)]
del im
del lb
## print training log message
lr = lr_schdr.get_lr()
lr = sum(lr) / len(lr)
print_log_msg(
i, cfg.max_iter, lr, time_meter, loss_meter,
loss_pre_meter, loss_aux_meters)
##validation loop
validation_loss = []
for it, (im, lb) in enumerate(Bar(valid)):
net.eval()
im = im.cuda()
lb = lb.cuda()
lb = torch.squeeze(lb, 1)
with torch.no_grad():
logits, *logits_aux = net(im)
loss_pre = criteria_pre(logits, lb)
loss_aux = [crit(lgt, lb) for crit, lgt in zip(criteria_aux, logits_aux)]
loss = loss_pre + sum(loss_aux)
validation_loss.append(loss.item())
del im
del lb
## print training log messag
validation_loss = sum(validation_loss)/len(validation_loss)
print(f'Validation loss: {validation_loss}')
if best_validation > validation_loss:
print('new best performance, storing model')
best_validation = validation_loss
state = net.state_dict()
torch.save(state, osp.join(cfg.respth, 'best_validation.pth'))
## dump the final model and evaluate the result
save_pth = osp.join(cfg.respth, 'model_final.pth')
logger.info('\nsave models to {}'.format(save_pth))
state = net.state_dict()
torch.save(state, save_pth)
logger.info('\nevaluating the final model')
torch.cuda.empty_cache()
heads, mious = eval_model(net, 2, cfg.im_root, cfg.test_im_anns)
logger.info(tabulate([mious, ], headers=heads, tablefmt='orgtbl'))
return
def train():
logger = logging.getLogger()
is_dist = dist.is_initialized()
## dataset
dl = get_data_loader(cfg.im_root,
cfg.train_im_anns,
cfg.ims_per_gpu,
cfg.scales,
cfg.cropsize,
cfg.max_iter,
mode='train',
distributed=is_dist)
## model
net, criteria_pre, criteria_aux = set_model()
if dist.get_rank() == 0:
exp_name = "cityscapes_repl"
wandb.init(project="bisenet", name="cityscapes_repl")
wandb.watch(net)
## optimizer
optim = set_optimizer(net)
## fp16
if has_apex:
opt_level = 'O1' if cfg.use_fp16 else 'O0'
net, optim = amp.initialize(net, optim, opt_level=opt_level)
## ddp training
net = set_model_dist(net)
## meters
time_meter, loss_meter, loss_pre_meter, loss_aux_meters = set_meters()
## lr scheduler
lr_schdr = WarmupPolyLrScheduler(
optim,
power=0.9,
max_iter=cfg.max_iter,
warmup_iter=cfg.warmup_iters,
warmup_ratio=0.1,
warmup='exp',
last_epoch=-1,
)
## train loop
for it, (im, lb) in enumerate(dl):
net.train()
im = im.cuda()
lb = lb.cuda()
lb = torch.squeeze(lb, 1)
optim.zero_grad()
logits, *logits_aux = net(im)
loss_pre = criteria_pre(logits, lb)
loss_aux = [
crit(lgt, lb) for crit, lgt in zip(criteria_aux, logits_aux)
]
loss = loss_pre + sum(loss_aux)
if has_apex:
with amp.scale_loss(loss, optim) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
optim.step()
torch.cuda.synchronize()
lr_schdr.step()
time_meter.update()
loss_meter.update(loss.item())
loss_pre_meter.update(loss_pre.item())
_ = [
mter.update(lss.item())
for mter, lss in zip(loss_aux_meters, loss_aux)
]
lr = lr_schdr.get_lr()
lr = sum(lr) / len(lr)
## print training log message
if dist.get_rank() == 0:
loss_avg = loss_meter.get()[0]
wandb.log(
{
"lr": lr,
"time": time_meter.get()[0],
"loss": loss_avg,
"loss_pre": loss_pre_meter.get()[0],
**{
f"loss_aux_{el.name}": el.get()[0]
for el in loss_aux_meters
}
},
commit=False)
if (it + 1) % 100 == 0: print(it, ' - ', lr, ' - ', loss_avg)
if (it + 1) % 2000 == 0:
# dump the model and evaluate the result
save_pth = osp.join(cfg.respth, f"{exp_name}_{it}.pth")
state = net.module.state_dict()
torch.save(state, save_pth)
wandb.save(save_pth)
if ((it + 1) % 2000 == 0):
logger.info('\nevaluating the model')
heads, mious = eval_model(net, 2, cfg.im_root, cfg.val_im_anns, it)
logger.info(tabulate([
mious,
], headers=heads, tablefmt='orgtbl'))
if (dist.get_rank() == 0):
wandb.log({k: v for k, v in zip(heads, mious)}, commit=False)
if (dist.get_rank() == 0):
wandb.log({"t": it}, step=it)
return