def train(self):
epoch_time = AverageMeter()
end = time.time()
self.model.train()
for epoch in range(self.start_epoch, self.run_config.epochs):
self.logger.log('\n' + '-' * 30 +
'Train epoch: {}'.format(epoch + 1) + '-' * 30 +
'\n',
mode='retrain')
epoch_str = 'epoch[{:03d}/{:03d}]'.format(epoch + 1,
self.run_config.epochs)
self.scheduler.step(epoch)
train_lr = self.scheduler.get_lr()
time_left = epoch_time.average * (self.run_config.epochs - epoch)
common_log = '[Train the {:}] Left={:} LR={:}'.format(
epoch_str,
str(timedelta(seconds=time_left)) if epoch != 0 else None,
train_lr)
self.logger.log(common_log, 'retrain')
# train log have been wrote in train_one_epoch
loss, acc, miou, fscore = self.train_one_epoch(epoch)
epoch_time.update(time.time() - end)
end = time.time()
# perform validation at the end of each epoch.
val_loss, val_acc, val_miou, val_fscore = self.validate(
epoch, is_test=False, use_train_mode=False)
val_monitor_metric = get_monitor_metric(self.monitor_metric,
val_loss, val_acc,
val_miou, val_fscore)
is_best = val_monitor_metric > self.best_monitor
self.best_monitor = max(self.best_monitor, val_monitor_metric)
# update visdom
if self.vis is not None:
self.vis.visdom_update(epoch, 'loss', [loss, val_loss])
self.vis.visdom_update(epoch, 'accuracy', [acc, val_acc])
self.vis.visdom_update(epoch, 'miou', [miou, val_miou])
self.vis.visdom_update(epoch, 'f1score', [fscore, val_fscore])
# save checkpoint
if (epoch + 1) % self.run_config.save_ckpt_freq == 0 or (
epoch + 1) == self.run_config.epochs or is_best:
checkpoint = {
'state_dict': self.model.state_dict(),
'weight_optimizer': self.optimizer.state_dict(),
'weight_scheduler': self.scheduler.state_dict(),
'best_monitor': (self.monitor_metric, self.best_monitor),
'start_epoch': epoch + 1,
'actual_path': self.run_config.actual_path,
'cell_genotypes': self.run_config.cell_genotypes
}
filename = self.logger.path(mode='retrain', is_best=is_best)
save_checkpoint(checkpoint,
filename,
self.logger,
mode='retrain')
def train(self, fix_net_weights=False):
# have config valid_batch_size, and ignored drop_last.
data_loader = self.run_manager.run_config.train_loader
iter_per_epoch = len(data_loader)
total_iteration = iter_per_epoch * self.run_manager.run_config.epochs
if fix_net_weights: # used to debug
data_loader = [(0, 0)] * iter_per_epoch
print('Train Phase close for debug')
# arch_parameter update frequency and times in each iteration.
#update_schedule = self.arch_search_config.get_update_schedule(iter_per_epoch)
# pay attention here, total_epochs include warmup epochs
epoch_time = AverageMeter()
end_epoch = time.time()
# TODO : use start_epochs
for epoch in range(self.start_epoch,
self.run_manager.run_config.epochs):
self.logger.log('\n' + '-' * 30 +
'Train Epoch: {}'.format(epoch + 1) + '-' * 30 +
'\n',
mode='search')
self.run_manager.scheduler.step(epoch)
train_lr = self.run_manager.scheduler.get_lr()
arch_lr = self.arch_optimizer.param_groups[0]['lr']
self.net.set_tau(self.arch_search_config.tau_max -
(self.arch_search_config.tau_max -
self.arch_search_config.tau_min) * (epoch) /
(self.run_manager.run_config.epochs))
tau = self.net.get_tau()
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
accs = AverageMeter()
mious = AverageMeter()
fscores = AverageMeter()
#valid_data_time = AverageMeter()
valid_losses = AverageMeter()
valid_accs = AverageMeter()
valid_mious = AverageMeter()
valid_fscores = AverageMeter()
self.net.train()
epoch_str = 'epoch[{:03d}/{:03d}]'.format(
epoch + 1, self.run_manager.run_config.epochs)
time_left = epoch_time.average * (
self.run_manager.run_config.epochs - epoch)
common_log = '[*Train-Search* the {:}] Left={:} WLR={:} ALR={:} tau={:}'\
.format(epoch_str, str(timedelta(seconds=time_left)) if epoch != 0 else None, train_lr, arch_lr, tau)
self.logger.log(common_log, 'search')
end = time.time()
for i, (datas, targets) in enumerate(data_loader):
#if i == 29: break
if not fix_net_weights:
if torch.cuda.is_available():
datas = datas.to(self.run_manager.device,
non_blocking=True)
targets = targets.to(self.run_manager.device,
non_blocking=True)
else:
raise ValueError('do not support cpu version')
data_time.update(time.time() - end)
# get single_path in each iteration
_, network_index = self.net.get_network_arch_hardwts_with_constraint(
)
_, aspp_index = self.net.get_aspp_hardwts_index()
single_path = self.net.sample_single_path(
self.run_manager.run_config.nb_layers, aspp_index,
network_index)
logits = self.net.single_path_forward(datas, single_path)
# loss
loss = self.run_manager.criterion(logits, targets)
# metrics and update
evaluator = Evaluator(
self.run_manager.run_config.nb_classes)
evaluator.add_batch(targets, logits)
acc = evaluator.Pixel_Accuracy()
miou = evaluator.Mean_Intersection_over_Union()
fscore = evaluator.Fx_Score()
losses.update(loss.data.item(), datas.size(0))
accs.update(acc.item(), datas.size(0))
mious.update(miou.item(), datas.size(0))
fscores.update(fscore.item(), datas.size(0))
self.net.zero_grad()
loss.backward()
self.run_manager.optimizer.step()
#end_valid = time.time()
valid_datas, valid_targets = self.run_manager.run_config.valid_next_batch
if torch.cuda.is_available():
valid_datas = valid_datas.to(self.run_manager.device,
non_blocking=True)
valid_targets = valid_targets.to(
self.run_manager.device, non_blocking=True)
else:
raise ValueError('do not support cpu version')
_, network_index = self.net.get_network_arch_hardwts_with_constraint(
)
_, aspp_index = self.net.get_aspp_hardwts_index()
single_path = self.net.sample_single_path(
self.run_manager.run_config.nb_layers, aspp_index,
network_index)
logits = self.net.single_path_forward(
valid_datas, single_path)
loss = self.run_manager.criterion(logits, valid_targets)
# metrics and update
valid_evaluator = Evaluator(
self.run_manager.run_config.nb_classes)
valid_evaluator.add_batch(valid_targets, logits)
acc = valid_evaluator.Pixel_Accuracy()
miou = valid_evaluator.Mean_Intersection_over_Union()
fscore = valid_evaluator.Fx_Score()
valid_losses.update(loss.data.item(), datas.size(0))
valid_accs.update(acc.item(), datas.size(0))
valid_mious.update(miou.item(), datas.size(0))
valid_fscores.update(fscore.item(), datas.size(0))
self.net.zero_grad()
loss.backward()
#if (i+1) % 5 == 0:
# print('network_arch_parameters.grad in search phase:\n',
# self.net.network_arch_parameters.grad)
self.arch_optimizer.step()
# batch_time of one iter of train and valid.
batch_time.update(time.time() - end)
end = time.time()
if (
i + 1
) % self.run_manager.run_config.train_print_freq == 0 or i + 1 == iter_per_epoch:
Wstr = '|*Search*|' + time_string(
) + '[{:}][iter{:03d}/{:03d}]'.format(
epoch_str, i + 1, iter_per_epoch)
Tstr = '|Time | {batch_time.val:.2f} ({batch_time.avg:.2f}) Data {data_time.val:.2f} ({data_time.avg:.2f})'.format(
batch_time=batch_time, data_time=data_time)
Bstr = '|Base | [Loss {loss.val:.3f} ({loss.avg:.3f}) Accuracy {acc.val:.2f} ({acc.avg:.2f}) MIoU {miou.val:.2f} ({miou.avg:.2f}) F {fscore.val:.2f} ({fscore.avg:.2f})]'.format(
loss=losses, acc=accs, miou=mious, fscore=fscores)
Astr = '|Arch | [Loss {loss.val:.3f} ({loss.avg:.3f}) Accuracy {acc.val:.2f} ({acc.avg:.2f}) MIoU {miou.val:.2f} ({miou.avg:.2f}) F {fscore.val:.2f} ({fscore.avg:.2f})]'.format(
loss=valid_losses,
acc=valid_accs,
miou=valid_mious,
fscore=valid_fscores)
self.logger.log(Wstr + '\n' + Tstr + '\n' + Bstr +
'\n' + Astr,
mode='search')
_, network_index = self.net.get_network_arch_hardwts_with_constraint(
) # set self.hardwts again
_, aspp_index = self.net.get_aspp_hardwts_index()
single_path = self.net.sample_single_path(
self.run_manager.run_config.nb_layers, aspp_index,
network_index)
cell_arch_entropy, network_arch_entropy, total_entropy = self.net.calculate_entropy(
single_path)
# update visdom
if self.vis is not None:
self.vis.visdom_update(epoch, 'loss',
[losses.average, valid_losses.average])
self.vis.visdom_update(epoch, 'accuracy',
[accs.average, valid_accs.average])
self.vis.visdom_update(epoch, 'miou',
[mious.average, valid_mious.average])
self.vis.visdom_update(
epoch, 'f1score', [fscores.average, valid_fscores.average])
self.vis.visdom_update(epoch, 'cell_entropy',
[cell_arch_entropy])
self.vis.visdom_update(epoch, 'network_entropy',
[network_arch_entropy])
self.vis.visdom_update(epoch, 'entropy', [total_entropy])
#torch.cuda.empty_cache()
# update epoch_time
epoch_time.update(time.time() - end_epoch)
end_epoch = time.time()
epoch_str = '{:03d}/{:03d}'.format(
epoch + 1, self.run_manager.run_config.epochs)
log = '[{:}] train :: loss={:.2f} accuracy={:.2f} miou={:.2f} f1score={:.2f}\n' \
'[{:}] valid :: loss={:.2f} accuracy={:.2f} miou={:.2f} f1score={:.2f}\n'.format(
epoch_str, losses.average, accs.average, mious.average, fscores.average,
epoch_str, valid_losses.average, valid_accs.average, valid_mious.average, valid_fscores.average
)
self.logger.log(log, mode='search')
self.logger.log(
'<<<---------->>> Super Network decoding <<<---------->>> ',
mode='search')
actual_path, cell_genotypes = self.net.network_cell_arch_decode()
#print(cell_genotypes)
new_genotypes = []
for _index, genotype in cell_genotypes:
xlist = []
print(_index, genotype)
for edge_genotype in genotype:
for (node_str, select_index) in edge_genotype:
xlist.append((node_str, self.run_manager.run_config.
conv_candidates[select_index]))
new_genotypes.append((_index, xlist))
log_str = 'The {:} decode network:\n' \
'actual_path = {:}\n' \
'genotype:'.format(epoch_str, actual_path)
for _index, genotype in new_genotypes:
log_str += 'index: {:} arch: {:}\n'.format(_index, genotype)
self.logger.log(log_str, mode='network_space', display=False)
# TODOļ¼ perform save the best network ckpt
# 1. save network_arch_parameters and cell_arch_parameters
# 2. save weight_parameters
# 3. weight_optimizer.state_dict
# 4. arch_optimizer.state_dict
# 5. training process
# 6. monitor_metric and the best_value
# get best_monitor in valid phase.
val_monitor_metric = get_monitor_metric(
self.run_manager.monitor_metric, valid_losses.average,
valid_accs.average, valid_mious.average, valid_fscores.average)
is_best = self.run_manager.best_monitor < val_monitor_metric
self.run_manager.best_monitor = max(self.run_manager.best_monitor,
val_monitor_metric)
# 1. if is_best : save_current_ckpt
# 2. if can be divided : save_current_ckpt
#self.run_manager.save_model(epoch, {
# 'arch_optimizer': self.arch_optimizer.state_dict(),
#}, is_best=True, checkpoint_file_name=None)
# TODO: have modification on checkpoint_save semantics
if (epoch +
1) % self.run_manager.run_config.save_ckpt_freq == 0 or (
epoch +
1) == self.run_manager.run_config.epochs or is_best:
checkpoint = {
'state_dict':
self.net.state_dict(),
'weight_optimizer':
self.run_manager.optimizer.state_dict(),
'weight_scheduler':
self.run_manager.scheduler.state_dict(),
'arch_optimizer':
self.arch_optimizer.state_dict(),
'best_monitor': (self.run_manager.monitor_metric,
self.run_manager.best_monitor),
'warmup':
False,
'start_epochs':
epoch + 1,
}
checkpoint_arch = {
'actual_path': actual_path,
'cell_genotypes': cell_genotypes,
}
filename = self.logger.path(mode='search', is_best=is_best)
filename_arch = self.logger.path(mode='arch', is_best=is_best)
save_checkpoint(checkpoint,
filename,
self.logger,
mode='search')
save_checkpoint(checkpoint_arch,
filename_arch,
self.logger,
mode='arch')
def warm_up(self, warmup_epochs):
if warmup_epochs <= 0:
self.logger.log('=> warmup close', mode='warm')
#print('\twarmup close')
return
# set optimizer and scheduler in warm_up phase
lr_max = self.arch_search_config.warmup_lr
data_loader = self.run_manager.run_config.train_loader
scheduler_params = self.run_manager.run_config.optimizer_config[
'scheduler_params']
optimizer_params = self.run_manager.run_config.optimizer_config[
'optimizer_params']
momentum, nesterov, weight_decay = optimizer_params[
'momentum'], optimizer_params['nesterov'], optimizer_params[
'weight_decay']
eta_min = scheduler_params['eta_min']
optimizer_warmup = torch.optim.SGD(self.net.weight_parameters(),
lr_max,
momentum,
weight_decay=weight_decay,
nesterov=nesterov)
# set initial_learning_rate in weight_optimizer
#for param_groups in self.run_manager.optimizer.param_groups:
# param_groups['lr'] = lr_max
lr_scheduler_warmup = torch.optim.lr_scheduler.CosineAnnealingLR(
optimizer_warmup, warmup_epochs, eta_min)
iter_per_epoch = len(data_loader)
total_iteration = warmup_epochs * iter_per_epoch
self.logger.log('=> warmup begin', mode='warm')
epoch_time = AverageMeter()
end_epoch = time.time()
for epoch in range(self.warmup_epoch, warmup_epochs):
self.logger.log('\n' + '-' * 30 +
'Warmup Epoch: {}'.format(epoch + 1) + '-' * 30 +
'\n',
mode='warm')
lr_scheduler_warmup.step(epoch)
warmup_lr = lr_scheduler_warmup.get_lr()
self.net.train()
batch_time = AverageMeter()
data_time = AverageMeter()
losses = AverageMeter()
accs = AverageMeter()
mious = AverageMeter()
fscores = AverageMeter()
epoch_str = 'epoch[{:03d}/{:03d}]'.format(epoch + 1, warmup_epochs)
time_left = epoch_time.average * (warmup_epochs - epoch)
common_log = '[Warmup the {:}] Left={:} LR={:}'.format(
epoch_str,
str(timedelta(seconds=time_left)) if epoch != 0 else None,
warmup_lr)
self.logger.log(common_log, mode='warm')
end = time.time()
for i, (datas, targets) in enumerate(data_loader):
#if i == 29: break
if torch.cuda.is_available():
datas = datas.to(self.run_manager.device,
non_blocking=True)
targets = targets.to(self.run_manager.device,
non_blocking=True)
else:
raise ValueError('do not support cpu version')
data_time.update(time.time() - end)
# get single_path in each iteration
_, network_index = self.net.get_network_arch_hardwts_with_constraint(
)
_, aspp_index = self.net.get_aspp_hardwts_index()
single_path = self.net.sample_single_path(
self.run_manager.run_config.nb_layers, aspp_index,
network_index)
logits = self.net.single_path_forward(datas, single_path)
# update without entropy reg in warm_up phase
loss = self.run_manager.criterion(logits, targets)
# measure metrics and update
evaluator = Evaluator(self.run_manager.run_config.nb_classes)
evaluator.add_batch(targets, logits)
acc = evaluator.Pixel_Accuracy()
miou = evaluator.Mean_Intersection_over_Union()
fscore = evaluator.Fx_Score()
losses.update(loss.data.item(), datas.size(0))
accs.update(acc, datas.size(0))
mious.update(miou, datas.size(0))
fscores.update(fscore, datas.size(0))
self.net.zero_grad()
loss.backward()
self.run_manager.optimizer.step()
batch_time.update(time.time() - end)
end = time.time()
if (
i + 1
) % self.run_manager.run_config.train_print_freq == 0 or i + 1 == iter_per_epoch:
Wstr = '|*WARM-UP*|' + time_string(
) + '[{:}][iter{:03d}/{:03d}]'.format(
epoch_str, i + 1, iter_per_epoch)
Tstr = '|Time | [{batch_time.val:.2f} ({batch_time.avg:.2f}) Data {data_time.val:.2f} ({data_time.avg:.2f})]'.format(
batch_time=batch_time, data_time=data_time)
Bstr = '|Base | [Loss {loss.val:.3f} ({loss.avg:.3f}) Accuracy {acc.val:.2f} ({acc.avg:.2f}) MIoU {miou.val:.2f} ({miou.avg:.2f}) F {fscore.val:.2f} ({fscore.avg:.2f})]'\
.format(loss=losses, acc=accs, miou=mious, fscore=fscores)
self.logger.log(Wstr + '\n' + Tstr + '\n' + Bstr, 'warm')
#torch.cuda.empty_cache()
epoch_time.update(time.time() - end_epoch)
end_epoch = time.time()
'''
# TODO: wheter perform validation after each epoch in warmup phase ?
valid_loss, valid_acc, valid_miou, valid_fscore = self.validate()
valid_log = 'Warmup Valid\t[{0}/{1}]\tLoss\t{2:.6f}\tAcc\t{3:6.4f}\tMIoU\t{4:6.4f}\tF\t{5:6.4f}'\
.format(epoch+1, warmup_epochs, valid_loss, valid_acc, valid_miou, valid_fscore)
#'\tflops\t{6:}M\tparams{7:}M'\
valid_log += 'Train\t[{0}/{1}]\tLoss\t{2:.6f}\tAcc\t{3:6.4f}\tMIoU\t{4:6.4f}\tFscore\t{5:6.4f}'
self.run_manager.write_log(valid_log, 'valid')
'''
# continue warmup phrase
self.warmup = epoch + 1 < warmup_epochs
self.warmup_epoch = self.warmup_epoch + 1
#self.start_epoch = self.warmup_epoch
# To save checkpoint in warmup phase at specific frequency.
if (epoch +
1) % self.run_manager.run_config.save_ckpt_freq == 0 or (
epoch + 1) == warmup_epochs:
state_dict = self.net.state_dict()
# rm architecture parameters because, in warm_up phase, arch_parameters are not updated.
#for key in list(state_dict.keys()):
# if 'cell_arch_parameters' in key or 'network_arch_parameters' in key or 'aspp_arch_parameters' in key:
# state_dict.pop(key)
checkpoint = {
'state_dict': state_dict,
'weight_optimizer':
self.run_manager.optimizer.state_dict(),
'weight_scheduler':
self.run_manager.optimizer.state_dict(),
'warmup': self.warmup,
'warmup_epoch': epoch + 1,
}
filename = self.logger.path(mode='warm', is_best=False)
save_path = save_checkpoint(checkpoint,
filename,
self.logger,
mode='warm')
def train(self):
self.data_train = self.data_loader.read_data_to_tensor(
self.data_loader._train_path,
self.device,
max_size=None,
normalize_digits=True,
has_start_node=True)
self.data_dev = self.data_loader.read_data_to_tensor(
self.data_loader._eval_paths[0],
self.device,
max_size=None,
normalize_digits=True,
has_start_node=True)
self.data_test = self.data_loader.read_data_to_tensor(
self.data_loader._eval_paths[1],
self.device,
max_size=None,
normalize_digits=True,
has_start_node=True)
num_data = sum(self.data_train[1])
num_batches = num_data // hparams.batch_size + 1
best_epoch = 0
best_dev_f1 = 0.0
early_epoch = 0
for epoch in range(1, hparams.num_epochs + 1):
train_err = 0.
train_data_er = 0.
train_sample_er = 0.
train_total = 0.
start_time = time.time()
num_back = 0
for batch in range(1, num_batches + 1):
word, char, _, _, labels, masks, lengths = self.data_loader.get_batch_tensor(
self.data_train,
hparams.batch_size,
unk_replace=hparams.unk_replace)
samples = self.sampling(word, char, masks, lengths)
self.net.train()
sos_mat = labels.new_zeros(
(labels.size(0), 1)).fill_(hparams.sos).long()
input_label = torch.cat([sos_mat, labels], dim=1)
input_label = input_label[:, :-1]
sample_sos_mat = sos_mat.repeat(1, hparams.num_samples).view(
-1, hparams.num_samples, 1)
input_sample = torch.cat([sample_sos_mat, samples], dim=2)
input_sample = input_sample[:, :, :-1]
self.optimizer.zero_grad()
loss, data_loss, sample_loss = self.net.loss(
word, char, input_label, input_sample, labels, samples,
masks, lengths)
loss.backward()
if hparams.clip_grad:
nn.utils.clip_grad_norm_(self.net.parameters(),
hparams.clip_grad_norm)
self.optimizer.step()
num_inst = masks.size(0)
train_err += loss.item() * num_inst
train_data_er += data_loss.item() * num_inst
train_sample_er += sample_loss.item() * num_inst
train_total += num_inst
time_ave = (time.time() - start_time) / batch
time_left = (num_batches - batch) * time_ave
# update log
if batch % 100 == 0:
sys.stdout.write("\b" * num_back)
sys.stdout.write(" " * num_back)
sys.stdout.write("\b" * num_back)
log_info = 'train: %d/%d loss: %.4f, time left (estimated): %.2fs' % (
batch, num_batches, train_err / train_total, time_left)
sys.stdout.write(log_info)
sys.stdout.flush()
num_back = len(log_info)
sys.stdout.write("\b" * num_back)
sys.stdout.write(" " * num_back)
sys.stdout.write("\b" * num_back)
self.logger.info(
'epoch: %d, train: %d, loss: %.4f, data loss: %.4f, sample loss: %.4f, time: %.2fs, lr:%.4f'
% (epoch, num_batches, train_err / train_total,
train_data_er / train_total, train_sample_er / train_total,
time.time() - start_time, self.lr))
# evaluate performance on dev data
tmp_filename = os.path.join(self.config.tmp_path,
'dev%d' % (epoch))
f1 = self.eval('dev', epoch, tmp_filename)
if best_dev_f1 <= f1:
best_dev_f1 = f1
best_epoch = epoch
early_epoch = 0
save_checkpoint(
{
'epoch': best_epoch,
'state_dict': self.net.state_dict(),
'optimizer': self.optimizer.state_dict()
},
join(self.config.checkpoint_path,
"%s_%d" % (self.config.model_name, best_epoch)))
else:
if epoch > hparams.early_start:
early_epoch += 1
if early_epoch > hparams.early_patience:
self.logger.info("early stopped, best epoch: %d" %
best_epoch)
os._exit(0)
# evaluate performance on test data
tmp_filename = os.path.join(self.config.tmp_path,
'test%d' % (epoch))
_ = self.eval('test', epoch, tmp_filename)
if epoch % hparams.schedule == 0:
self.lr = hparams.learning_rate / (1.0 +
epoch * hparams.decay_rate)
if hparams.optimizer == 'SGD':
self.optimizer = optim.SGD(self.net.parameters(),
lr=self.lr,
momentum=0.9,
weight_decay=0.0,
nesterov=True)
elif hparams.optimizer == 'Adam':
self.optimizer = optim.Adam(self.net.parameters(),
lr=self.lr)
else:
NotImplementedError()