def train():
data = config['data']
img_size, img_size_test = config['img_size'] if len(
config['img_size']
) == 2 else config['img_size'] * 2 # train, test sizes
epochs = config[
'epochs'] # 500200 batches at bs 64, 117263 images = 273 epochs
batch_size = config['batch_size']
accumulate = config[
'accumulate'] # effective bs = batch_size * accumulate = 16 * 4 = 64
# Initialize
init_seeds(config['seed'])
if config['multi_scale']:
img_sz_min = round(img_size / 32 / 1.5)
img_sz_max = round(img_size / 32 * 1.5)
img_size = img_sz_max * 32 # initiate with maximum multi_scale size
print('Using multi-scale %g - %g' % (img_sz_min * 32, img_size))
# Configure run
data_dict = parse_data_cfg(data)
nc = int(data_dict['classes']) # number of classes
# Initialize Teacher
if config['teacher_darknet'] == 'default':
teacher = Darknet(cfg=config['teacher_cfg'],
arc=config['teacher_arc']).to(device)
elif config['teacher_darknet'] == 'soft':
teacher = SoftDarknet(cfg=config['teacher_cfg'],
arc=config['teacher_arc']).to(device)
# Initialize Student
if config['student_darknet'] == 'default':
if 'nano' in config['student_cfg']:
print('Using a YOLO Nano arc')
student = YOLO_Nano(config['student_cfg']).to(device)
else:
student = Darknet(cfg=config['student_cfg']).to(device)
elif config['student_darknet'] == 'soft':
student = SoftDarknet(cfg=config['student_cfg'],
arc=config['student_arc']).to(device)
# Create Discriminators
D_models = None
if len(config['teacher_indexes']):
D_models = Discriminator(config['teacher_indexes'], teacher,
config['D_kernel_size'], False).to(device)
G_optim = create_optimizer(student, config)
D_optim = create_optimizer(D_models, config, is_D=True)
GAN_criterion = torch.nn.BCEWithLogitsLoss()
mask = None
if ('mask' in config and config['mask']) or ('mask_path' in config
and config['mask_path']):
print('Creating mask')
mask = create_mask_LTH(teacher).to(device)
start_epoch, best_fitness, teacher, student, mask, D_models, G_optim, D_optim = load_kd_checkpoints(
config, teacher, student, mask, D_models, G_optim, D_optim, device)
if mask is not None:
print('Applying mask in teacher')
apply_mask_LTH(teacher, mask)
del mask
torch.cuda.empty_cache()
if config['xavier_norm']:
initialize_model(student, torch.nn.init.xavier_normal_)
elif config['xavier_uniform']:
initialize_model(student, torch.nn.init.xavier_uniform_)
G_scheduler = create_scheduler(config, G_optim, start_epoch)
D_scheduler = create_scheduler(config, D_optim, start_epoch)
# Mixed precision training https://github.com/NVIDIA/apex
if mixed_precision:
student, G_optim = amp.initialize(student,
G_scheduler,
opt_level='O1',
verbosity=0)
# Initialize distributed training
if device.type != 'cpu' and torch.cuda.device_count(
) > 1 and torch.distributed.is_available():
dist.init_process_group(
backend='nccl', # 'distributed backend'
init_method=
'tcp://127.0.0.1:9999', # distributed training init method
world_size=1, # number of nodes for distributed training
rank=0) # distributed training node rank
teacher = torch.nn.parallel.DistributedDataParallel(
teacher, find_unused_parameters=True)
teacher.yolo_layers = teacher.module.yolo_layers # move yolo layer indices to top level
student = torch.nn.parallel.DistributedDataParallel(
student, find_unused_parameters=True)
student.yolo_layers = student.module.yolo_layers # move yolo layer indices to top level
trainloader, validloader = create_dataloaders(config)
# Start training
nb = len(trainloader)
prebias = start_epoch == 0
student.nc = nc # attach number of classes to student
teacher.nc = nc
student.arc = config['student_arc'] # attach yolo architecture
teacher.arc = config['teacher_arc']
student.hyp = config['hyp'] # attach hyperparameters to student
teacher.hyp = config['hyp']
student.class_weights = labels_to_class_weights(
trainloader.dataset.labels, nc).to(device) # attach class weights
teacher.class_weights = student.class_weights
maps = np.zeros(nc) # mAP per class
# torch.autograd.set_detect_anomaly(True)
results = (
0, 0, 0, 0, 0, 0, 0
) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification'
t0 = time.time()
torch_utils.model_info(student, report='summary') # 'full' or 'summary'
print('Starting training for %g epochs...' % epochs)
teacher.train()
max_wo_best = 0
###############
# Start epoch #
###############
for epoch in range(start_epoch, epochs):
student.train()
student.gr = 1 - (1 +
math.cos(min(epoch * 2, epochs) * math.pi /
epochs)) / 2 # GIoU <-> 1.0 loss ratio
# Prebias
if prebias:
ne = max(round(30 / nb), 3) # number of prebias epochs
ps = np.interp(epoch, [0, ne], [0.1, config['hyp']['lr0'] * 2]), \
np.interp(epoch, [0, ne], [0.9, config['hyp']['momentum']]) # prebias settings (lr=0.1, momentum=0.9)
if epoch == ne:
print_model_biases(student)
prebias = False
# Bias optimizer settings
G_optim.param_groups[2]['lr'] = ps[0]
if G_optim.param_groups[2].get(
'momentum') is not None: # for SGD but not Adam
G_optim.param_groups[2]['momentum'] = ps[1]
# Update image weights (optional)
if trainloader.dataset.image_weights:
w = student.class_weights.cpu().numpy() * (
1 - maps)**2 # class weights
image_weights = labels_to_image_weights(trainloader.dataset.labels,
nc=nc,
class_weights=w)
trainloader.dataset.indices = random.choices(
range(trainloader.dataset.n),
weights=image_weights,
k=trainloader.dataset.n) # rand weighted idx
mloss = torch.zeros(9).to(device) # mean losses
print(('\n' + '%10s' * 13) %
('Epoch', 'gpu_mem', 'GIoU', 'obj', 'cls', 'G_loss', 'D_loss',
'D_x', 'D_g_z1', 'D_g_z2', 'total', 'targets', 'img_size'))
pbar = tqdm(enumerate(trainloader), total=nb) # progress bar
####################
# Start mini-batch #
####################
for i, (imgs, targets, paths, _) in pbar:
real_data_label = ft(imgs.shape[0],
device=device).uniform_(.7, 1.0)
fake_data_label = ft(imgs.shape[0], device=device).uniform_(.0, .3)
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device).float(
) / 255.0 # uint8 to float32, 0 - 255 to 0.0 - 1.0
targets = targets.to(device)
# Plot images with bounding boxes
if ni < 1:
f = config[
'sub_working_dir'] + 'train_batch%g.png' % i # filename
plot_images(imgs=imgs, targets=targets, paths=paths, fname=f)
if tb_writer:
tb_writer.add_image(f,
cv2.imread(f)[:, :, ::-1],
dataformats='HWC')
# Multi-Scale training
if config['multi_scale']:
if ni / accumulate % 1 == 0: # adjust img_size (67% - 150%) every 1 batch
img_size = random.randrange(img_sz_min,
img_sz_max + 1) * 32
sf = img_size / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [
math.ceil(x * sf / 32.) * 32 for x in imgs.shape[2:]
] # new shape (stretched to 32-multiple)
imgs = F.interpolate(imgs,
size=ns,
mode='bilinear',
align_corners=False)
# Run student
if len(config['student_indexes']
) and epoch < config['second_stage']:
pred_std, fts_std = student(imgs, config['student_indexes'])
if 'nano' in config[
'student_cfg']: # YOLO Nano outputs in the reversed order
fts_std.reverse()
else:
pred_std = student(imgs)
###################################################
# Update D: maximize log(D(x)) + log(1 - D(G(z))) #
###################################################
D_loss_real, D_loss_fake, D_x, D_g_z1 = ft([.0]), ft([.0]), ft(
[.0]), ft([.0])
if epoch < config['second_stage']:
# Run teacher
with torch.no_grad():
_, fts_tch = teacher(imgs, config['teacher_indexes'])
# Adding noise to Discriminator: flipping labels
if random.random() < .05:
aux = real_data_label
real_data_label = fake_data_label
fake_data_label = aux
# Discriminate the real data
real_data_discrimination = D_models(fts_tch)
for output in real_data_discrimination:
D_x += output.mean().item() / 3.
# Discriminate the fake data
fake_data_discrimination = D_models(
[x.detach() for x in fts_std])
for output in fake_data_discrimination:
D_g_z1 += output.mean().item() / 3.
# Compute loss
for x in real_data_discrimination:
D_loss_real += GAN_criterion(x.view(-1), real_data_label)
for x in fake_data_discrimination:
D_loss_fake += GAN_criterion(x.view(-1), fake_data_label)
# Scale loss by nominal batch_size of 64
D_loss_real *= batch_size / 64
D_loss_fake *= batch_size / 64
# Compute gradient
D_loss_real.backward()
D_loss_fake.backward()
# Optimize accumulated gradient
if ni % accumulate == 0:
D_optim.step()
D_optim.zero_grad()
###################################
# Update G: maximize log(D(G(z))) #
###################################
G_loss, D_g_z2 = ft([.0]), ft([.0])
if epoch < config['second_stage']:
# Since we already update D, perform another forward with fake batch through D
fake_data_discrimination = D_models(
[x.detach() for x in fts_std])
for output in fake_data_discrimination:
D_g_z2 += output.mean().item() / 3.
# Compute loss
real_data_label = torch.ones(imgs.shape[0], device=device)
for x in fake_data_discrimination:
G_loss += GAN_criterion(
x.view(-1), real_data_label
) # fake labels are real for generator cost
# Scale loss by nominal batch_size of 64
G_loss *= batch_size / 64
# Compute gradient
G_loss.backward()
# Compute loss
obj_detec_loss, loss_items = compute_loss(pred_std, targets,
student)
# Scale loss by nominal batch_size of 64
obj_detec_loss *= batch_size / 64
if epoch < config['second_stage']: obj_detec_loss *= .05
# Compute gradient
obj_detec_loss.backward()
# Optimize accumulated gradient
if ni % accumulate == 0:
G_optim.step()
G_optim.zero_grad()
D_loss = D_loss_real + D_loss_fake
total_loss = obj_detec_loss + D_loss + G_loss
all_losses = torch.cat([
loss_items[:3], G_loss, D_loss, D_x, D_g_z1, D_g_z2, total_loss
]).detach()
if not torch.isfinite(total_loss):
print('WARNING: non-finite loss, ending training ', all_losses)
return results
# Print batch results
mloss = (mloss * i + all_losses) / (i + 1) # update mean losses
mem = '%.3gG' % (torch.cuda.memory_cached() /
1E9 if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 + '%10.3g' * 11) % ('%g/%g' %
(epoch, epochs - 1), mem,
*mloss, len(targets), img_size)
pbar.set_description(s)
##################
# End mini-batch #
##################
# Update scheduler
G_scheduler.step()
D_scheduler.step()
final_epoch = epoch + 1 == config['epochs']
if not config['notest'] or final_epoch: # Calculate mAP
results, maps = guarantee_test(student, config, device,
config['student_cfg'], data,
batch_size, img_size_test,
validloader, final_epoch, test.test)
# Write epoch results
with open(config['results_file'], 'a') as f:
f.write(s + '%10.3g' * 7 % results +
'\n') # P, R, mAP, F1, test_losses=(GIoU, obj, cls)
if len(config['name']) and config['bucket']:
os.system('gsutil cp results.txt gs://%s/results/results%s.txt' %
(config['bucket'], config['name']))
# Write Tensorboard results
if tb_writer:
x = list(mloss) + list(results)
titles = [
'GIoU', 'Objectness', 'Classification', 'Generator Loss',
'Discriminator Loss', 'D_x', 'D_g_z1', 'D_g_z2'
'Train Loss', 'Precision', 'Recall', 'mAP', 'F1', 'val GIoU',
'val Objectness', 'val Classification'
]
for xi, title in zip(x, titles):
tb_writer.add_scalar(title, xi, epoch)
# Update best mAP
fi = fitness(np.array(results).reshape(
1, -1)) # fitness_i = weighted combination of [P, R, mAP, F1]
if fi > best_fitness:
best_fitness = fi
max_wo_best = 0
else:
max_wo_best += 1
if config['early_stop'] and max_wo_best == config['early_stop']:
print('Ending training due to early stop')
# Save training results
save = (not config['nosave']) or (final_epoch and not config['evolve'])
if save:
with open(config['results_file'], 'r') as f:
# Create checkpoint
chkpt = {
'epoch':
epoch,
'best_fitness':
best_fitness,
'training_results':
f.read(),
'model':
student.module.state_dict()
if type(student) is nn.parallel.DistributedDataParallel
else student.state_dict(),
'D':
D_models.state_dict(),
'G_optim':
None if final_epoch else G_optim.state_dict(),
'D_optim':
None if final_epoch else D_optim.state_dict()
}
# Save last checkpoint
torch.save(chkpt, config['last'])
# Save best checkpoint
if best_fitness == fi:
torch.save(
chkpt, config['best_gan']
if epoch < config['second_stage'] else config['best'])
# Delete checkpoint
del chkpt
torch.cuda.empty_cache()
if config['early_stop'] and max_wo_best == config['early_stop']: break
#############
# End epoch #
#############
n = config['name']
if len(n):
n = '_' + n if not n.isnumeric() else n
fresults, flast, fbest = 'results%s.txt' % n, 'last%s.pt' % n, 'best%s.pt' % n
os.rename(config['results_file'], config['sub_working_dir'] + fresults)
os.rename(config['last'], config['sub_working_dir'] +
flast) if os.path.exists(config['last']) else None
os.rename(config['best'], config['sub_working_dir'] +
fbest) if os.path.exists(config['best']) else None
# Updating results, last and best
config['results_file'] = config['sub_working_dir'] + fresults
config['last'] = config['sub_working_dir'] + flast
config['best'] = config['sub_working_dir'] + fbest
if config['bucket']: # save to cloud
os.system('gsutil cp %s gs://%s/results' %
(fresults, config['bucket']))
os.system('gsutil cp %s gs://%s/weights' %
(config['sub_working_dir'] + flast, config['bucket']))
# os.system('gsutil cp %s gs://%s/weights' % (config['sub_working_dir'] + fbest, config['bucket']))
if not config['evolve']:
plot_results(folder=config['sub_working_dir'])
print('%g epochs completed in %.3f hours.\n' % (epoch - start_epoch + 1,
(time.time() - t0) / 3600))
dist.destroy_process_group() if torch.cuda.device_count() > 1 else None
torch.cuda.empty_cache()
return results
def train():
data = config['data']
img_size, img_size_test = config['img_size'] if len(config['img_size']) == 2 else config['img_size'] * 2 # train, test sizes
epochs = config['epochs'] # 500200 batches at bs 64, 117263 images = 273 epochs
batch_size = config['batch_size']
accumulate = config['accumulate'] # effective bs = batch_size * accumulate = 16 * 4 = 64
# Initialize
init_seeds(config['seed'])
if config['multi_scale']:
img_sz_min = round(img_size / 32 / 1.5)
img_sz_max = round(img_size / 32 * 1.5)
img_size = img_sz_max * 32 # initiate with maximum multi_scale size
print('Using multi-scale %g - %g' % (img_sz_min * 32, img_size))
# Configure run
data_dict = parse_data_cfg(data)
nc = int(data_dict['classes']) # number of classes
config['single_cls'] = nc == 1
# Initialize Teacher
if config['teacher_darknet'] == 'default':
teacher = Darknet(cfg=config['teacher_cfg'], arc=config['teacher_arc']).to(device)
elif config['teacher_darknet'] == 'soft':
teacher = SoftDarknet(cfg=config['teacher_cfg'], arc=config['teacher_arc']).to(device)
# Initialize Student
if config['student_darknet'] == 'default':
if 'nano' in config['student_cfg']:
print('Using a YOLO Nano arc')
student = YOLO_Nano(config['student_cfg']).to(device)
else: student = Darknet(cfg=config['student_cfg']).to(device)
elif config['student_darknet'] == 'soft':
student = SoftDarknet(cfg=config['student_cfg'], arc=config['student_arc']).to(device)
# Create Hint Layers
hint_models = None
if len(config['teacher_indexes']):
hint_models = HintModel(config, teacher, student).to(device)
optimizer = create_optimizer(student, config)
if len(config['teacher_indexes']):
add_to_optimizer(config, hint_models, optimizer)
HINT = nn.L1Loss()
mask = None
if ('mask' in config and config['mask']) or ('mask_path' in config and config['mask_path']):
print('Creating mask')
mask = create_mask_LTH(teacher).to(device)
start_epoch, best_fitness, teacher, student, mask, hint_models, optimizer, _ = load_kd_checkpoints(
config,
teacher, student,
mask, hint_models,
optimizer, None, device
)
if mask is not None:
print('Applying mask in teacher')
apply_mask_LTH(teacher, mask)
del mask
torch.cuda.empty_cache()
if config['xavier_norm']:
initialize_model(student, torch.nn.init.xavier_normal_)
elif config['xavier_uniform']:
initialize_model(student, torch.nn.init.xavier_uniform_)
scheduler = create_scheduler(config, optimizer, start_epoch)
# Mixed precision training https://github.com/NVIDIA/apex
if mixed_precision:
student, optimizer = amp.initialize(student, optimizer, opt_level='O1', verbosity=0)
# Initialize distributed training
if device.type != 'cpu' and torch.cuda.device_count() > 1 and torch.distributed.is_available():
dist.init_process_group(backend='nccl', # 'distributed backend'
init_method='tcp://127.0.0.1:9999', # distributed training init method
world_size=1, # number of nodes for distributed training
rank=0) # distributed training node rank
teacher = torch.nn.parallel.DistributedDataParallel(teacher, find_unused_parameters=True)
teacher.yolo_layers = teacher.module.yolo_layers # move yolo layer indices to top level
student = torch.nn.parallel.DistributedDataParallel(student, find_unused_parameters=True)
student.yolo_layers = student.module.yolo_layers # move yolo layer indices to top level
trainloader, validloader = create_dataloaders(config)
# Start training
nb = len(trainloader)
prebias = start_epoch == 0
student.nc = nc # attach number of classes to student
teacher.nc = nc
student.arc = config['student_arc'] # attach yolo architecture
teacher.arc = config['teacher_arc']
student.hyp = config['hyp'] # attach hyperparameters to student
teacher.hyp = config['hyp'] # attach hyperparameters to student
mu = ft([h['mu']]) # mu variable to weight the hard lcls and soft lcls in Eq: 2 (value not informed)
ni = ft([h['ni']]) # ni variable to weight the teacher bounded regression loss.
margin = ft([h['margin']]) # m variable used as margin in teacher bounded regression loss. (value not informed)
student.class_weights = labels_to_class_weights(trainloader.dataset.labels, nc).to(device) # attach class weights
teacher.class_weights = student.class_weights
maps = np.zeros(nc) # mAP per class
# torch.autograd.set_detect_anomaly(True)
results = (0, 0, 0, 0, 0, 0, 0) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification'
t0 = time.time()
torch_utils.model_info(student, report='summary') # 'full' or 'summary'
print('Starting training for %g epochs...' % epochs)
teacher.eval()
max_wo_best = 0
###############
# Start epoch #
###############
for epoch in range(start_epoch, epochs):
student.train()
student.gr = 1 - (1 + math.cos(min(epoch * 2, epochs) * math.pi / epochs)) / 2 # GIoU <-> 1.0 loss ratio
# Prebias
if prebias:
ne = max(round(30 / nb), 3) # number of prebias epochs
ps = np.interp(epoch, [0, ne], [0.1, config['hyp']['lr0'] * 2]), \
np.interp(epoch, [0, ne], [0.9, config['hyp']['momentum']]) # prebias settings (lr=0.1, momentum=0.9)
if epoch == ne:
print_model_biases(student)
prebias = False
# Bias optimizer settings
optimizer.param_groups[2]['lr'] = ps[0]
if optimizer.param_groups[2].get('momentum') is not None: # for SGD but not Adam
optimizer.param_groups[2]['momentum'] = ps[1]
# Update image weights (optional)
if trainloader.dataset.image_weights:
w = student.class_weights.cpu().numpy() * (1 - maps) ** 2 # class weights
image_weights = labels_to_image_weights(trainloader.dataset.labels, nc=nc, class_weights=w)
trainloader.dataset.indices = random.choices(range(trainloader.dataset.n), weights=image_weights, k=trainloader.dataset.n) # rand weighted idx
mloss = torch.zeros(5).to(device) # mean losses
print(('\n' + '%10s' * 9) % ('Epoch', 'gpu_mem', 'GIoU', 'obj', 'cls', 'hint', 'total', 'targets', 'img_size'))
pbar = tqdm(enumerate(trainloader), total=nb) # progress bar
####################
# Start mini-batch #
####################
for i, (imgs, targets, paths, _) in pbar:
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device).float() / 255.0 # uint8 to float32, 0 - 255 to 0.0 - 1.0
targets = targets.to(device)
# Plot images with bounding boxes
if ni < 1:
f = config['sub_working_dir'] + 'train_batch%g.png' % i # filename
plot_images(imgs=imgs, targets=targets, paths=paths, fname=f)
if tb_writer:
tb_writer.add_image(f, cv2.imread(f)[:, :, ::-1], dataformats='HWC')
# Multi-Scale training
if config['multi_scale']:
if ni / accumulate % 1 == 0: # adjust img_size (67% - 150%) every 1 batch
img_size = random.randrange(img_sz_min, img_sz_max + 1) * 32
sf = img_size / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [math.ceil(x * sf / 32.) * 32 for x in imgs.shape[2:]] # new shape (stretched to 32-multiple)
imgs = F.interpolate(imgs, size=ns, mode='bilinear', align_corners=False)
# Run teacher
with torch.no_grad():
inf_out, tch_train_output, fts_tch = teacher(imgs, config['teacher_indexes'])
tch_loss = compute_loss(tch_train_output, targets, teacher, True)
bboxes_tch = non_max_suppression(inf_out, conf_thres=.1, iou_thres=0.6)
targets_tch = torch.Tensor()
# creating labels from teacher outputs
for j, detections in enumerate(bboxes_tch): # a list of detections per image
if detections is not None and len(detections):
for *xyxy, _, cls_tch in detections: # ignoring the confidence
xyxy = torch.Tensor(xyxy)
if len(xyxy.shape) == 1: xyxy = xyxy.view(-1, *xyxy.shape)
l = torch.Tensor(len(xyxy), 6)
# the boxes are unormalized. If not multi_scale, width != height
xyxy[:, (0, 2)] /= imgs.shape[2]
xyxy[:, (1, 3)] /= imgs.shape[3]
l[:, 0] = j # the j-th image
l[:, 1] = cls_tch # classes
l[:, 2:] = xyxy2xywh(xyxy) # bboxes in darknet format
targets_tch = torch.cat([targets_tch, l])
targets_tch = targets_tch.to(device)
# Run student
pred_std, fts_std = student(imgs, config['student_indexes'])
# Run hint layers
fts_guided = hint_models(fts_std)
################
# Compute loss #
################
hard_loss = compute_loss(pred_std, targets, student, True)
soft_loss = compute_loss(pred_std, targets_tch, student, True)
# Loss = Loss Hard + Loss Soft
upper_bound_lreg = hard_loss[0] if hard_loss[0] + margin > tch_loss[0] else ft([.0])
lbox = hard_loss[0] + ni * upper_bound_lreg # Equation 4
lobj = hard_loss[1]
lcls = mu * hard_loss[2] + (1. - mu) * soft_loss[2] # Equation 2
lhint = torch.cuda.FloatTensor([.0])
for (hint, guided) in zip(fts_tch, fts_guided):
lhint += HINT(guided, hint) # Equation 6
loss = lbox + lobj + lcls + lhint
loss_items = torch.cat((lbox, lobj, lcls, lhint, loss)).detach()
if not torch.isfinite(loss):
print('WARNING: non-finite loss, ending training ', loss_items)
return results
# Scale loss by nominal batch_size of 64
loss *= batch_size / 64
# Compute gradient
if mixed_precision:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
# Optimize accumulated gradient
if ni % accumulate == 0:
optimizer.step()
optimizer.zero_grad()
# Print batch results
mloss = (mloss * i + loss_items) / (i + 1) # update mean losses
mem = '%.3gG' % (torch.cuda.memory_cached() / 1E9 if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 + '%10.3g' * 7) % ('%g/%g' % (epoch, epochs - 1), mem, *mloss, len(targets), img_size)
pbar.set_description(s)
##################
# End mini-batch #
##################
# Update scheduler
scheduler.step()
final_epoch = epoch + 1 == epochs
if not config['notest'] or final_epoch: # Calculate mAP
teacher = teacher.to('cpu')
hint_models = hint_models.to('cpu')
results, maps = guarantee_test(
student, config, device, config['cfg'], data,
batch_size, img_size_test, validloader,
final_epoch, test.test
)
teacher = teacher.to(device)
hint_models = hint_models.to(device)
# Write epoch results
with open(config['results_file'], 'a') as f:
f.write(s + '%10.3g' * 7 % results + '\n') # P, R, mAP, F1, test_losses=(GIoU, obj, cls)
if len(config['name']) and config['bucket']:
os.system('gsutil cp results.txt gs://%s/results/results%s.txt' % (config['bucket'], config['name']))
# Write Tensorboard results
if tb_writer:
x = list(mloss) + list(results)
titles = ['GIoU', 'Objectness', 'Classification', 'Hint', 'Train loss',
'Precision', 'Recall', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification']
for xi, title in zip(x, titles):
tb_writer.add_scalar(title, xi, epoch)
# Update best mAP
fi = fitness(np.array(results).reshape(1, -1)) # fitness_i = weighted combination of [P, R, mAP, F1]
if fi > best_fitness:
best_fitness = fi
max_wo_best = 0
else:
max_wo_best += 1
if config['early_stop'] and max_wo_best == config['early_stop']: print('Ending training due to early stop')
# Save training results
save = (not config['nosave']) or (final_epoch and not config['evolve'])
if save:
with open(config['results_file'], 'r') as f:
# Create checkpoint
chkpt = {
'epoch': epoch,
'best_fitness': best_fitness,
'training_results': f.read(),
'model': student.module.state_dict() if type(student) is nn.parallel.DistributedDataParallel
else student.state_dict(),
'hint': None if hint_models is None
else hint_models.module.state_dict() if type(hint_models) is nn.parallel.DistributedDataParallel
else hint_models.state_dict(),
'optimizer': None if final_epoch else optimizer.state_dict()}
# Save last checkpoint
torch.save(chkpt, config['last'])
# Save best checkpoint
if best_fitness == fi:
torch.save(chkpt, config['best'])
# Delete checkpoint
del chkpt
torch.cuda.empty_cache()
if config['early_stop'] and max_wo_best == config['early_stop']: break
#############
# End epoch #
#############
n = config['name']
if len(n):
n = '_' + n if not n.isnumeric() else n
fresults, flast, fbest = 'results%s.txt' % n, 'last%s.pt' % n, 'best%s.pt' % n
os.rename(config['results_file'], config['sub_working_dir'] + fresults)
os.rename(config['last'], config['sub_working_dir'] + flast) if os.path.exists(config['last']) else None
os.rename(config['best'], config['sub_working_dir'] + fbest) if os.path.exists(config['best']) else None
# Updating results, last and best
config['results_file'] = config['sub_working_dir'] + fresults
config['last'] = config['sub_working_dir'] + flast
config['best'] = config['sub_working_dir'] + fbest
if config['bucket']: # save to cloud
os.system('gsutil cp %s gs://%s/results' % (fresults, config['bucket']))
os.system('gsutil cp %s gs://%s/weights' % (config['sub_working_dir'] + flast, config['bucket']))
# os.system('gsutil cp %s gs://%s/weights' % (config['sub_working_dir'] + fbest, config['bucket']))
if not config['evolve']:
plot_results(folder= config['sub_working_dir'])
print('%g epochs completed in %.3f hours.\n' % (epoch - start_epoch + 1, (time.time() - t0) / 3600))
dist.destroy_process_group() if torch.cuda.device_count() > 1 else None
torch.cuda.empty_cache()
return results
initialize_model(model, torch.nn.init.xavier_uniform_)
# Mixed precision training https://github.com/NVIDIA/apex
if mixed_precision:
model, optimizer = amp.initialize(model, optimizer, opt_level='O1', verbosity=0)
# Initialize distributed training
if device.type != 'cpu' and torch.cuda.device_count() > 1 and torch.distributed.is_available():
dist.init_process_group(backend='nccl', # 'distributed backend'
init_method='tcp://127.0.0.1:9999', # distributed training init method
world_size=1, # number of nodes for distributed training
rank=0) # distributed training node rank
model = torch.nn.parallel.DistributedDataParallel(model, find_unused_parameters=True)
model.yolo_layers = model.module.yolo_layers # move yolo layer indices to top level
trainloader, validloader = create_dataloaders(config)
# Start training
nb = len(trainloader)
prebias = start_epoch == 0
model.nc = nc # attach number of classes to model
config['single_cls'] = nc == 1
model.arc = config['arc'] # attach yolo architecture
model.hyp = config['hyp'] # attach hyperparameters to model
model.class_weights = labels_to_class_weights(trainloader.dataset.labels, nc).to(device) # attach class weights
maps = np.zeros(nc) # mAP per class
# torch.autograd.set_detect_anomaly(True)
results = (0, 0, 0, 0, 0, 0, 0) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification'
t0 = time.time()
torch_utils.model_info(model, report='summary') # 'full' or 'summary'
print('Starting training for %g epochs...' % config['epochs'])
def train():
cfg = config['cfg']
data = config['data']
img_size, img_size_test = config['img_size'] if len(config['img_size']) == 2 else config['img_size'] * 2 # train, test sizes
epochs = config['epochs'] # 500200 batches at bs 64, 117263 images = 273 epochs
batch_size = config['batch_size']
accumulate = config['accumulate'] # effective bs = batch_size * accumulate = 16 * 4 = 64
# Initialize
init_seeds(config['seed'])
if config['multi_scale']:
img_sz_min = round(img_size / 32 / 1.5)
img_sz_max = round(img_size / 32 * 1.5)
img_size = img_sz_max * 32 # initiate with maximum multi_scale size
print('Using multi-scale %g - %g' % (img_sz_min * 32, img_size))
# Configure run
data_dict = parse_data_cfg(data)
nc = 1 if config['single_cls'] else int(data_dict['classes']) # number of classes
# Initialize model
if config['darknet'] == 'default':
if 'nano' in cfg: model = YOLO_Nano(cfg).to(device)
else: model = Darknet(cfg, arc=config['arc']).to(device)
elif config['darknet'] == 'soft':
model = SoftDarknet(cfg, arc=config['arc']).to(device)
optimizer = create_optimizer(model, config)
start_epoch, best_fitness, model, optimizer = load_checkpoints(
config, model,
optimizer, device,
attempt_download, load_darknet_weights
)
if config['xavier_norm']:
initialize_model(model, torch.nn.init.xavier_normal_)
elif config['xavier_uniform']:
initialize_model(model, torch.nn.init.xavier_uniform_)
scheduler = create_scheduler(config, optimizer, start_epoch)
# Mixed precision training https://github.com/NVIDIA/apex
if mixed_precision:
model, optimizer = amp.initialize(model, optimizer, opt_level='O1', verbosity=0)
# # Plot lr schedule
# y = []
# for _ in range(epochs):
# scheduler.step()
# y.append(optimizer.param_groups[0]['lr'])
# plt.plot(y, '.-', label='LambdaLR')
# plt.xlabel('epoch')
# plt.ylabel('LR')
# plt.tight_layout()
# plt.savefig('LR.png', dpi=300)
# Initialize distributed training
if device.type != 'cpu' and torch.cuda.device_count() > 1 and torch.distributed.is_available():
dist.init_process_group(backend='nccl', # 'distributed backend'
init_method='tcp://127.0.0.1:9999', # distributed training init method
world_size=1, # number of nodes for distributed training
rank=0) # distributed training node rank
model = torch.nn.parallel.DistributedDataParallel(model, find_unused_parameters=True)
model.yolo_layers = model.module.yolo_layers # move yolo layer indices to top level
trainloader, validloader = create_dataloaders(config)
# Start training
nb = len(trainloader)
prebias = start_epoch == 0
model.nc = nc # attach number of classes to model
model.arc = config['arc'] # attach yolo architecture
model.hyp = config['hyp'] # attach hyperparameters to model
model.class_weights = labels_to_class_weights(trainloader.dataset.labels, nc).to(device) # attach class weights
maps = np.zeros(nc) # mAP per class
# torch.autograd.set_detect_anomaly(True)
results = (0, 0, 0, 0, 0, 0, 0) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification'
t0 = time.time()
torch_utils.model_info(model, report='summary') # 'full' or 'summary'
print('Starting training for %g epochs...' % epochs)
max_wo_best = 0
###############
# Start epoch #
###############
for epoch in range(start_epoch, epochs):
model.train()
model.gr = 1 - (1 + math.cos(min(epoch * 2, epochs) * math.pi / epochs)) / 2 # GIoU <-> 1.0 loss ratio
# Prebias
if prebias:
ne = max(round(30 / nb), 3) # number of prebias epochs
ps = np.interp(epoch, [0, ne], [0.1, config['hyp']['lr0'] * 2]), \
np.interp(epoch, [0, ne], [0.9, config['hyp']['momentum']]) # prebias settings (lr=0.1, momentum=0.9)
if epoch == ne:
print_model_biases(model)
prebias = False
# Bias optimizer settings
optimizer.param_groups[2]['lr'] = ps[0]
if optimizer.param_groups[2].get('momentum') is not None: # for SGD but not Adam
optimizer.param_groups[2]['momentum'] = ps[1]
# Update image weights (optional)
if trainloader.dataset.image_weights:
w = model.class_weights.cpu().numpy() * (1 - maps) ** 2 # class weights
image_weights = labels_to_image_weights(trainloader.dataset.labels, nc=nc, class_weights=w)
trainloader.dataset.indices = random.choices(range(trainloader.dataset.n), weights=image_weights, k=trainloader.dataset.n) # rand weighted idx
mloss = torch.zeros(4).to(device) # mean losses
print(('\n' + '%10s' * 8) % ('Epoch', 'gpu_mem', 'GIoU', 'obj', 'cls', 'total', 'targets', 'img_size'))
pbar = tqdm(enumerate(trainloader), total=nb) # progress bar
####################
# Start mini-batch #
####################
for i, (imgs, targets, paths, _) in pbar:
# for i, (imgs, targets, paths, _) in enumerate(trainloader):
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device).float() / 255.0 # uint8 to float32, 0 - 255 to 0.0 - 1.0
targets = targets.to(device)
# Plot images with bounding boxes
if ni < 1:
f = config['sub_working_dir'] + 'train_batch%g.png' % i # filename
plot_images(imgs=imgs, targets=targets, paths=paths, fname=f)
if tb_writer:
tb_writer.add_image(f, cv2.imread(f)[:, :, ::-1], dataformats='HWC')
# Multi-Scale training
if config['multi_scale']:
if ni / accumulate % 1 == 0: # adjust img_size (67% - 150%) every 1 batch
img_size = random.randrange(img_sz_min, img_sz_max + 1) * 32
sf = img_size / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [math.ceil(x * sf / 32.) * 32 for x in imgs.shape[2:]] # new shape (stretched to 32-multiple)
imgs = F.interpolate(imgs, size=ns, mode='bilinear', align_corners=False)
# Run model
pred = model(imgs)
# Compute loss
loss, loss_items = compute_loss(pred, targets, model)
if not torch.isfinite(loss):
print('WARNING: non-finite loss, ending training ', loss_items)
return results
# Scale loss by nominal batch_size of 64
loss *= batch_size / 64
# Compute gradient
if mixed_precision:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
# Optimize accumulated gradient
if ni % accumulate == 0:
optimizer.step()
optimizer.zero_grad()
# Print batch results
mloss = (mloss * i + loss_items) / (i + 1) # update mean losses
mem = '%.3gG' % (torch.cuda.memory_cached() / 1E9 if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 + '%10.3g' * 6) % ('%g/%g' % (epoch, epochs - 1), mem, *mloss, len(targets), img_size)
pbar.set_description(s)
##################
# End mini-batch #
##################
# Update scheduler
scheduler.step()
final_epoch = epoch + 1 == epochs
if not config['notest'] or final_epoch: # Calculate mAP
is_coco = any([x in data for x in ['coco.data', 'coco2014.data', 'coco2017.data']]) and model.nc == 80
results, maps = test.test(
cfg = cfg, data = data, batch_size=batch_size,
img_size=img_size_test, model=model,
conf_thres=0.001, # 0.001 if opt.evolve or (final_epoch and is_coco) else 0.01,
iou_thres=0.6, save_json=final_epoch and is_coco, single_cls=config['single_cls'],
dataloader=validloader, folder = config['sub_working_dir']
)
# Write epoch results
with open(config['results_file'], 'a') as f:
f.write(s + '%10.3g' * 7 % results + '\n') # P, R, mAP, F1, test_losses=(GIoU, obj, cls)
if len(config['name']) and config['bucket']:
os.system('gsutil cp results.txt gs://%s/results/results%s.txt' % (config['bucket'], config['name']))
# Write Tensorboard results
if tb_writer:
x = list(mloss) + list(results)
titles = ['GIoU', 'Objectness', 'Classification', 'Train loss',
'Precision', 'Recall', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification']
for xi, title in zip(x, titles):
tb_writer.add_scalar(title, xi, epoch)
# Update best mAP
fi = fitness(np.array(results).reshape(1, -1)) # fitness_i = weighted combination of [P, R, mAP, F1]
if fi > best_fitness:
best_fitness = fi
max_wo_best = 0
else:
max_wo_best += 1
if config['early_stop'] and max_wo_best == config['early_stop']: print('Ending training due to early stop')
# Save training results
save = (not config['nosave']) or (final_epoch and not config['evolve'])
if save:
with open(config['results_file'], 'r') as f:
# Create checkpoint
chkpt = {'epoch': epoch,
'best_fitness': best_fitness,
'training_results': f.read(),
'model': model.module.state_dict() if type(
model) is nn.parallel.DistributedDataParallel else model.state_dict(),
'optimizer': None if final_epoch else optimizer.state_dict()}
# Save last checkpoint
torch.save(chkpt, config['last'])
# Save best checkpoint
if best_fitness == fi:
torch.save(chkpt, config['best'])
# Save backup every 10 epochs (optional)
# if epoch > 0 and epoch % 10 == 0:
# torch.save(chkpt, config['sub_working_dir'] + 'backup%g.pt' % epoch)
# Delete checkpoint
del chkpt
torch.cuda.empty_cache()
if config['early_stop'] and max_wo_best == config['early_stop']: break
#############
# End epoch #
#############
n = config['name']
if len(n):
n = '_' + n if not n.isnumeric() else n
fresults, flast, fbest = 'results%s.txt' % n, 'last%s.pt' % n, 'best%s.pt' % n
os.rename(config['results_file'], config['sub_working_dir'] + fresults)
os.rename(config['last'], config['sub_working_dir'] + flast) if os.path.exists(config['last']) else None
os.rename(config['best'], config['sub_working_dir'] + fbest) if os.path.exists(config['best']) else None
# Updating results, last and best
config['results_file'] = config['sub_working_dir'] + fresults
config['last'] = config['sub_working_dir'] + flast
config['best'] = config['sub_working_dir'] + fbest
if config['bucket']: # save to cloud
os.system('gsutil cp %s gs://%s/results' % (fresults, config['bucket']))
os.system('gsutil cp %s gs://%s/weights' % (config['sub_working_dir'] + flast, config['bucket']))
# os.system('gsutil cp %s gs://%s/weights' % (config['sub_working_dir'] + fbest, config['bucket']))
if not config['evolve']:
plot_results(folder= config['sub_working_dir'])
print('%g epochs completed in %.3f hours.\n' % (epoch - start_epoch + 1, (time.time() - t0) / 3600))
dist.destroy_process_group() if torch.cuda.device_count() > 1 else None
torch.cuda.empty_cache()
return results