def do_train(cfg, model, data_loader, optimizer, scheduler, checkpointer,
device, arguments, args):
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
# #获得要剪枝的层
if cfg.PRUNE.TYPE != 'no':
if hasattr(model, 'module'):
backbone = model.module.backbone
else:
backbone = model.backbone
if cfg.PRUNE.TYPE == 'normal':
logger.info('normal sparse training')
_, _, prune_idx = normal_prune.parse_module_defs(
backbone.module_defs)
elif cfg.PRUNE.TYPE == 'shortcut':
logger.info('shortcut sparse training')
_, _, prune_idx, _, _ = shortcut_prune.parse_module_defs(
backbone.module_defs)
model.train()
save_to_disk = dist_util.get_rank() == 0
if args.use_tensorboard and save_to_disk:
try:
from torch.utils.tensorboard import SummaryWriter
except ImportError:
from tensorboardX import SummaryWriter
summary_writer = SummaryWriter(
log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
else:
summary_writer = None
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
for iteration, (images, targets, _) in enumerate(data_loader, start_iter):
iteration = iteration + 1
arguments["iteration"] = iteration
images = images.to(device)
targets = targets.to(device)
loss_dict = model(images, targets=targets)
loss = sum(loss for loss in loss_dict.values())
# reduce losses over all GPUs for logging purposes
loss_dict_reduced = reduce_loss_dict(loss_dict)
losses_reduced = sum(loss for loss in loss_dict_reduced.values())
meters.update(total_loss=losses_reduced, **loss_dict_reduced)
optimizer.zero_grad()
loss.backward()
# 对要剪枝层的γ参数稀疏化
if cfg.PRUNE.TYPE != 'no':
if hasattr(model, 'module'):
bn_sparse.updateBN(model.module.backbone.module_list,
cfg.PRUNE.SR, prune_idx)
else:
# print(model.backbone.module_list)
bn_sparse.updateBN(model.backbone.module_list, cfg.PRUNE.SR,
prune_idx)
optimizer.step()
scheduler.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % args.log_step == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
'mem: {mem}M',
]).format(
iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() / 1024.0 /
1024.0),
))
if summary_writer:
global_step = iteration
summary_writer.add_scalar('losses/total_loss',
losses_reduced,
global_step=global_step)
for loss_name, loss_item in loss_dict_reduced.items():
summary_writer.add_scalar('losses/{}'.format(loss_name),
loss_item,
global_step=global_step)
summary_writer.add_scalar('lr',
optimizer.param_groups[0]['lr'],
global_step=global_step)
if iteration % args.save_step == 0:
checkpointer.save("model_{:06d}".format(iteration), **arguments)
if args.eval_step > 0 and iteration % args.eval_step == 0 and not iteration == max_iter:
eval_results = do_evaluation(cfg,
model,
distributed=False,
iteration=iteration) #单gpu测试
if dist_util.get_rank() == 0 and summary_writer:
for eval_result, dataset in zip(eval_results,
cfg.DATASETS.TEST):
write_metric(eval_result['metrics'], 'metrics/' + dataset,
summary_writer, iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model
def do_train(cfg, model, data_loader, optimizer, scheduler, checkpointer,
device, arguments, args):
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
# 模型设置为train()模式，表示参数是可以进行更新的
model.train()
save_to_disk = dist_util.get_rank() == 0
# 这个是关于模型训练过程中的过程记录
if args.use_tensorboard and save_to_disk:
import tensorboardX
summary_writer = tensorboardX.SummaryWriter(
log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
else:
summary_writer = None
# dataloader的大小，根据配置文件中的iteration进行训练
# arguments = {"iteration": 0}，按照目前的理解是按照断点进行训练，这个表示的是当前的迭代次数这样
max_iter = len(data_loader)
start_iter = arguments["iteration"]
# 开始计时
start_training_time = time.time()
end = time.time()
# 一次训练中，数据长度应该是dataloader的大小，也就是按照batchsize进行分割之后的大小
# 数据集会返回图像和图像对应的标签，也就是(类别数目) （c+4）k，k个先验框、c个类别，然后加一个框的坐标位置
for iteration, (images, targets, _) in enumerate(data_loader, start_iter):
# print(iteration)
# print(targets)
iteration = iteration + 1
arguments["iteration"] = iteration
images = images.to(device)
targets = targets.to(device)
# 把输入和目标输出传入模型，模型就会返回loss
loss_dict = model(images, targets=targets)
loss = sum(loss for loss in loss_dict.values())
# reduce losses over all GPUs for logging purposes
# 这里是多GPU的操作，暂时先不用去理会
loss_dict_reduced = reduce_loss_dict(loss_dict)
losses_reduced = sum(loss for loss in loss_dict_reduced.values())
meters.update(total_loss=losses_reduced, **loss_dict_reduced)
# 这里是标准的反向传播的过程，传播就完事了
optimizer.zero_grad()
loss.backward()
optimizer.step()
scheduler.step()
# 记录时间、写日志、写模型然后保存训练中的过程记录之类的，这里也基本是死的，主要找到模型就完事了
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % args.log_step == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
'mem: {mem}M',
]).format(
iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() / 1024.0 /
1024.0),
))
if summary_writer:
global_step = iteration
summary_writer.add_scalar('losses/total_loss',
losses_reduced,
global_step=global_step)
for loss_name, loss_item in loss_dict_reduced.items():
summary_writer.add_scalar('losses/{}'.format(loss_name),
loss_item,
global_step=global_step)
summary_writer.add_scalar('lr',
optimizer.param_groups[0]['lr'],
global_step=global_step)
if iteration % args.save_step == 0:
checkpointer.save("model_{:06d}".format(iteration), **arguments)
# 目前问题主要存在这个部分，就是利用模型进行验证的过程中会报错，验证的文件有错误
if args.eval_step > 0 and iteration % args.eval_step == 0 and not iteration == max_iter:
eval_results = do_evaluation(cfg,
model,
distributed=args.distributed,
iteration=iteration)
if dist_util.get_rank() == 0 and summary_writer:
for eval_result, dataset in zip(eval_results,
cfg.DATASETS.TEST):
write_metric(eval_result['metrics'], 'metrics/' + dataset,
summary_writer, iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model
def do_train(cfg, model, data_loader, optimizer, scheduler, checkpointer,
arguments):
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
model.train()
summary_writer = torch.utils.tensorboard.SummaryWriter(
log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
for iteration, (images, targets, _) in enumerate(data_loader, start_iter):
iteration = iteration + 1
arguments["iteration"] = iteration
images = torch_utils.to_cuda(images)
targets = torch_utils.to_cuda(targets)
loss_dict = model(images, targets=targets)
loss = sum(loss for loss in loss_dict.values())
meters.update(total_loss=loss, **loss_dict)
optimizer.zero_grad()
loss.backward()
optimizer.step()
scheduler.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % cfg.LOG_STEP == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
'mem: {mem}M',
]).format(iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() /
1024.0 / 1024.0)))
global_step = iteration
summary_writer.add_scalar('losses/total_loss',
loss,
global_step=global_step)
for loss_name, loss_item in loss_dict.items():
summary_writer.add_scalar('losses/{}'.format(loss_name),
loss_item,
global_step=global_step)
summary_writer.add_scalar('lr',
optimizer.param_groups[0]['lr'],
global_step=global_step)
if iteration % cfg.MODEL_SAVE_STEP == 0:
checkpointer.save("model_{:06d}".format(iteration), **arguments)
if cfg.EVAL_STEP > 0 and iteration % cfg.EVAL_STEP == 0:
eval_results = do_evaluation(cfg, model, iteration=iteration)
for eval_result, dataset in zip(eval_results, cfg.DATASETS.TEST):
write_metric(eval_result['metrics'], 'metrics/' + dataset,
summary_writer, iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model
def do_train(cfg, model, data_loader, optimizer, scheduler, checkpointer,
device, arguments, args):
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
model.train()
save_to_disk = dist_util.get_rank() == 0
if args.use_tensorboard and save_to_disk:
import tensorboardX
summary_writer = tensorboardX.SummaryWriter(
log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
else:
summary_writer = None
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
for iteration, (images, targets, _, boxes_norm,
labels_norm) in enumerate(data_loader, start_iter):
iteration = iteration + 1
arguments["iteration"] = iteration
scheduler.step()
images = images.to(device)
targets = targets.to(device)
#+++++++++++++++++++++++++++++++++++++++++++++++ Mask GT ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
mask_t = np.zeros((images.shape[0], 81, 64, 64))
mask_t[:, 0, :, :] = np.ones((1, 1, 64, 64))
for i in range(images.shape[0]):
for L, B_norm in zip(labels_norm[i], boxes_norm[i]):
xmin = int(B_norm[0] * 64)
ymin = int(B_norm[1] * 64)
xmax = int(B_norm[2] * 64)
ymax = int(B_norm[3] * 64)
lab = int(L)
mask_t[i, 0, ymin:ymax, xmin:xmax] = 0.0
mask_t[i, lab, ymin:ymax, xmin:xmax] = 1.0
mask_t = Variable(torch.from_numpy((mask_t).astype(np.float32))).cuda()
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
loss_dict = model(images, targets=(targets, mask_t))
loss = sum(loss for loss in loss_dict.values())
# reduce losses over all GPUs for logging purposes
loss_dict_reduced = reduce_loss_dict(loss_dict)
losses_reduced = sum(loss for loss in loss_dict_reduced.values())
meters.update(total_loss=losses_reduced, **loss_dict_reduced)
optimizer.zero_grad()
loss.backward()
optimizer.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % args.log_step == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
'mem: {mem}M',
]).format(
iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() / 1024.0 /
1024.0),
))
if summary_writer:
global_step = iteration
summary_writer.add_scalar('losses/total_loss',
losses_reduced,
global_step=global_step)
for loss_name, loss_item in loss_dict_reduced.items():
summary_writer.add_scalar('losses/{}'.format(loss_name),
loss_item,
global_step=global_step)
summary_writer.add_scalar('lr',
optimizer.param_groups[0]['lr'],
global_step=global_step)
if iteration % args.save_step == 0:
checkpointer.save("model_{:06d}".format(iteration), **arguments)
if args.eval_step > 0 and iteration % args.eval_step == 0 and not iteration == max_iter:
eval_results = do_evaluation(cfg,
model,
distributed=args.distributed,
iteration=iteration)
if dist_util.get_rank() == 0 and summary_writer:
for eval_result, dataset in zip(eval_results,
cfg.DATASETS.TEST):
write_metric(eval_result['metrics'], 'metrics/' + dataset,
summary_writer, iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model
def do_train(cfg, model, data_loader, optimizer, checkpointer, arguments,
scheduler):
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
model.train()
summary_writer = torch.utils.tensorboard.SummaryWriter(
log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
scaler = torch.cuda.amp.GradScaler()
print(model)
for iteration, (images, targets, _) in enumerate(data_loader, start_iter):
iteration = iteration + 1
arguments["iteration"] = iteration
images = torch_utils.to_cuda(images)
targets = torch_utils.to_cuda(targets)
# Casts operations to mixed precision
with torch.cuda.amp.autocast():
loss_dict = model(images.half(), targets=targets)
loss = sum(loss for loss in loss_dict.values())
meters.update(total_loss=loss, **loss_dict)
optimizer.zero_grad()
# Scales the loss, and calls backward()
# to create scaled gradients
scaler.scale(loss).backward()
# loss.backward()
# Unscales gradients and calls
# or skips optimizer.step()
scaler.step(optimizer)
# optimizer.step(iteration)
# Updates the scale for next iteration
scaler.update()
if iteration > 5000:
scheduler.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % cfg.LOG_STEP == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
lr = optimizer.param_groups[0]['lr']
to_log = [
f"iter: {iteration:06d}",
f"lr: {lr:.5f}",
f'{meters}',
f"eta: {eta_string}",
]
if torch.cuda.is_available():
mem = round(torch.cuda.max_memory_allocated() / 1024.0 /
1024.0)
to_log.append(f'mem: {mem}M')
logger.info(meters.delimiter.join(to_log))
global_step = iteration
summary_writer.add_scalar('losses/total_loss',
loss,
global_step=global_step)
for loss_name, loss_item in loss_dict.items():
summary_writer.add_scalar('losses/{}'.format(loss_name),
loss_item,
global_step=global_step)
summary_writer.add_scalar('lr',
optimizer.param_groups[0]['lr'],
global_step=global_step)
if iteration % cfg.MODEL_SAVE_STEP == 0:
checkpointer.save("model_{:06d}".format(iteration), **arguments)
if cfg.EVAL_STEP > 0 and iteration % cfg.EVAL_STEP == 0:
eval_results = do_evaluation(cfg, model, iteration=iteration)
for eval_result, dataset in zip(eval_results, cfg.DATASETS.TEST):
write_metric(eval_result['metrics'], 'metrics/' + dataset,
summary_writer, iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
if iteration >= cfg.SOLVER.MAX_ITER:
break
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model
def do_train(cfg, model, data_loader, optimizer, scheduler, checkpointer,
device, arguments, args):
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
model.train()
save_to_disk = dist_util.get_rank() == 0
if args.use_tensorboard and save_to_disk:
import tensorboardX
summary_writer = tensorboardX.SummaryWriter(
log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
else:
summary_writer = None
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
max_epoch = 10
for epoch in range(max_epoch):
logger.info('epoch: {}'.format(epoch))
for iteration, (images, targets,
_) in enumerate(data_loader, start_iter):
# print("imgs shape: ",images.shape,iteration)
# continue
# iteration = iteration + 1
arguments["iteration"] = iteration
scheduler.step()
images = images.to(device)
targets = targets.to(device)
loss_dict = model(images, targets=targets)
loss = sum(loss for loss in loss_dict.values())
# reduce losses over all GPUs for logging purposes
loss_dict_reduced = reduce_loss_dict(loss_dict)
losses_reduced = sum(loss for loss in loss_dict_reduced.values())
meters.update(total_loss=losses_reduced, **loss_dict_reduced)
optimizer.zero_grad()
loss.backward()
optimizer.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
# log step
if iteration % args.log_step == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
'mem: {mem}M',
]).format(
iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() / 1024.0 /
1024.0),
))
if summary_writer:
global_step = iteration
summary_writer.add_scalar('losses/total_loss',
losses_reduced,
global_step=global_step)
for loss_name, loss_item in loss_dict_reduced.items():
summary_writer.add_scalar(
'losses/{}'.format(loss_name),
loss_item,
global_step=global_step)
summary_writer.add_scalar('lr',
optimizer.param_groups[0]['lr'],
global_step=global_step)
# save step
if iteration % args.save_step == 0:
checkpointer.save("model_{:06d}".format(iteration),
**arguments)
# eval step
if args.eval_step > 0 and iteration % args.eval_step == 0 and not iteration == max_iter:
# if True:
eval_results = do_evaluation(cfg,
model,
distributed=args.distributed,
iteration=iteration)
if dist_util.get_rank() == 0 and summary_writer:
for eval_result, dataset in zip(eval_results,
cfg.DATASETS.TEST):
write_metric(eval_result['metrics'],
'metrics/' + dataset, summary_writer,
iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model
def do_train_with_style(cfg, model, data_loader, style_loader, optimizer,
scheduler, checkpointer, device, arguments, args):
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
model.train()
save_to_disk = dist_util.get_rank() == 0
if args.use_tensorboard and save_to_disk:
try:
from torch.utils.tensorboard import SummaryWriter
except ImportError:
from tensorboardX import SummaryWriter
summary_writer = SummaryWriter(
log_dir=os.path.join(cfg.OUTPUT_DIR, 'tf_logs'))
else:
summary_writer = None
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
# prepare AdaIN models
default_path = '/content/drive/MyDrive/DA_detection/models/'
vgg_path = default_path + 'vgg_normalized.pth'
if 'VGG_PATH' in os.environ:
vgg_path = os.environ['VGG_PATH']
decoder_path = default_path + 'decoder.pth'
if 'DECODER_PATH' in os.environ:
decoder_path = os.environ['DECODER_PATH']
# DEBUG: print('AdaIN > models loaded')
for iteration, (images, targets, ids) in enumerate(data_loader,
start_iter):
iteration = iteration + 1
arguments["iteration"] = iteration
# AdaIN routine
random.seed()
styles = next(iter(style_loader))
# DEBUG: print('AdaIN > begin new batch')
if random.random() > args.p:
apply_style_transfer(vgg_path, decoder_path, images, styles[0],
args.p)
# DEBUG: print('AdaIN > end batch')
images = images.to(device)
targets = targets.to(device)
loss_dict = model(images, targets=targets)
loss = sum(loss for loss in loss_dict.values())
# reduce losses over all GPUs for logging purposes
loss_dict_reduced = reduce_loss_dict(loss_dict)
losses_reduced = sum(loss for loss in loss_dict_reduced.values())
meters.update(total_loss=losses_reduced, **loss_dict_reduced)
optimizer.zero_grad()
loss.backward()
optimizer.step()
scheduler.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % args.log_step == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
if device == "cuda":
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
'mem: {mem}M',
]).format(
iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() / 1024.0 /
1024.0),
))
else:
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
'{meters}',
"eta: {eta}",
]).format(
iter=iteration,
lr=optimizer.param_groups[0]['lr'],
meters=str(meters),
eta=eta_string,
))
if summary_writer:
global_step = iteration
summary_writer.add_scalar('losses/total_loss',
losses_reduced,
global_step=global_step)
for loss_name, loss_item in loss_dict_reduced.items():
summary_writer.add_scalar('losses/{}'.format(loss_name),
loss_item,
global_step=global_step)
summary_writer.add_scalar('lr',
optimizer.param_groups[0]['lr'],
global_step=global_step)
if iteration % args.save_step == 0:
checkpointer.save("model_{:06d}".format(iteration), **arguments)
if args.eval_step > 0 and iteration % args.eval_step == 0 and not iteration == max_iter:
eval_results = do_evaluation(cfg,
model,
distributed=args.distributed,
iteration=iteration)
if dist_util.get_rank() == 0 and summary_writer:
for eval_result, dataset in zip(eval_results,
cfg.DATASETS.TEST):
write_metric(eval_result['metrics'], 'metrics/' + dataset,
summary_writer, iteration)
model.train() # *IMPORTANT*: change to train mode after eval.
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model
def do_train(
cfg: CfgNode,
model: SSDDetector,
data_loader: DataLoader,
optimizer: SGD,
scheduler: MultiStepLR,
checkpointer,
device: device,
arguments,
args: Namespace,
output_dir: Path,
model_manager: Dict[str, Any],
) -> SSDDetector:
logger = logging.getLogger("SSD.trainer")
logger.info("Start training ...")
meters = MetricLogger()
model.train()
save_to_disk = dist_util.get_rank() == 0
if args.use_tensorboard and save_to_disk:
import tensorboardX
summary_writer = tensorboardX.SummaryWriter(logdir=output_dir / "logs")
else:
summary_writer = None
max_iter = len(data_loader)
start_iter = arguments["iteration"]
start_training_time = time.time()
end = time.time()
logger.info("MAX_ITER: {}".format(max_iter))
# GB: 2019-09-08:
# For rescaling tests, do an eval before fine-tuning-training, so we know what
# the eval results are before any weights are updated:
# do_evaluation(
# cfg,
# model,
# distributed=args.distributed,
# iteration=0,
# )
# model.train() # *IMPORTANT*: change to train mode after eval.
for iteration, (images, targets, _) in enumerate(data_loader, start_iter):
# TODO: Print learning rate:
iteration = iteration + 1
arguments["iteration"] = iteration
scheduler.step()
images = images.to(device)
targets = targets.to(device)
loss_dict = model(images, targets=targets)
loss = sum(loss for loss in loss_dict.values())
# reduce losses over all GPUs for logging purposes
loss_dict_reduced = reduce_loss_dict(loss_dict)
losses_reduced = sum(loss for loss in loss_dict_reduced.values())
loss = sum(loss for loss in loss_dict.values())
meters.update(total_loss=losses_reduced, **loss_dict_reduced)
optimizer.zero_grad()
loss.backward()
optimizer.step()
batch_time = time.time() - end
end = time.time()
meters.update(time=batch_time)
if iteration % args.log_step == 0:
eta_seconds = meters.time.global_avg * (max_iter - iteration)
eta_string = str(datetime.timedelta(seconds=int(eta_seconds)))
logger.info(
meters.delimiter.join([
"iter: {iter:06d}",
"lr: {lr:.5f}",
"{meters}",
"eta: {eta}",
"mem: {mem}M",
]).format(
iter=iteration,
lr=optimizer.param_groups[0]["lr"],
meters=str(meters),
eta=eta_string,
mem=round(torch.cuda.max_memory_allocated() / 1024.0 /
1024.0),
))
if summary_writer:
global_step = iteration
summary_writer.add_scalar("losses/total_loss",
losses_reduced,
global_step=global_step)
for loss_name, loss_item in loss_dict_reduced.items():
summary_writer.add_scalar(
"losses/{}".format(loss_name),
loss_item,
global_step=global_step,
)
summary_writer.add_scalar("lr",
optimizer.param_groups[0]["lr"],
global_step=global_step)
# This project doesn't use epochs, it does something with batch samplers
# instead, so there is only a concept of "iteration". For now hardcode epoch as
# zero to put into file name:
epoch = 0
save_name = f"ssd{cfg.INPUT.IMAGE_SIZE}-vgg_{cfg.DATASETS.TRAIN[0]}_0_{epoch}_{iteration:06d}"
model_path = Path(output_dir) / f"{save_name}.pth"
# Above if block would be replaced by this:
if iteration % args.save_step == 0:
checkpointer.save(save_name, **arguments)
# Do eval when training, to trace the mAP changes and see performance improved
# whether or nor
if (args.eval_step > 0 and iteration % args.eval_step == 0
and not iteration == max_iter):
eval_results = do_evaluation(
cfg,
model,
distributed=args.distributed,
iteration=iteration,
)
do_best_model_checkpointing(cfg, model_path, eval_results,
model_manager, logger)
if dist_util.get_rank() == 0 and summary_writer:
for eval_result, dataset in zip(eval_results,
cfg.DATASETS.TEST):
write_metric(
eval_result["metrics"],
"metrics/" + dataset,
summary_writer,
iteration,
)
model.train() # *IMPORTANT*: change to train mode after eval.
if iteration % args.save_step == 0:
remove_extra_checkpoints(output_dir, [model_path], logger)
checkpointer.save("model_final", **arguments)
# compute training time
total_training_time = int(time.time() - start_training_time)
total_time_str = str(datetime.timedelta(seconds=total_training_time))
logger.info("Total training time: {} ({:.4f} s / it)".format(
total_time_str, total_training_time / max_iter))
return model