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[WIP] Feature/ddp fixed (#401)

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* Squashed commit of the following:

commit d738487089e41c22b3b1cd73aa7c1c40320a6ebf
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 17:33:38 2020 +0700

    Adding world_size

    Reduce calls to torch.distributed. For use in create_dataloader.

commit e742dd9619d29306c7541821238d3d7cddcdc508
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 15:38:48 2020 +0800

    Make SyncBN a choice

commit e90d4004387e6103fecad745f8cbc2edc918e906
Merge: 5bf8beb cd90360
Author: yzchen <Chenyzsjtu@gmail.com>
Date:   Tue Jul 14 15:32:10 2020 +0800

    Merge pull request #6 from NanoCode012/patch-5

    Update train.py

commit cd9036017e7f8bd519a8b62adab0f47ea67f4962
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 13:39:29 2020 +0700

    Update train.py

    Remove redundant `opt.` prefix.

commit 5bf8bebe8873afb18b762fe1f409aca116fac073
Merge: c9558a9 a1c8406
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 14:09:51 2020 +0800

    Merge branch 'master' of https://github.com/ultralytics/yolov5 into feature/DDP_fixed

commit c9558a9b51547febb03d9c1ca42e2ef0fc15bb31
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 13:51:34 2020 +0800

    Add device allocation for loss compute

commit 4f08c692fb5e943a89e0ee354ef6c80a50eeb28d
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 9 11:16:27 2020 +0800

    Revert drop_last

commit 1dabe33a5a223b758cc761fc8741c6224205a34b
Merge: a1ce9b1 4b8450b
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 9 11:15:49 2020 +0800

    Merge branch 'feature/DDP_fixed' of https://github.com/MagicFrogSJTU/yolov5 into feature/DDP_fixed

commit a1ce9b1e96b71d7fcb9d3e8143013eb8cebe5e27
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 9 11:15:21 2020 +0800

    fix lr warning

commit 4b8450b46db76e5e58cd95df965d4736077cfb0e
Merge: b9a50ae 02c63ef
Author: yzchen <Chenyzsjtu@gmail.com>
Date:   Wed Jul 8 21:24:24 2020 +0800

    Merge pull request #4 from NanoCode012/patch-4

    Add drop_last for multi gpu

commit 02c63ef81cf98b28b10344fe2cce08a03b143941
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Wed Jul 8 10:08:30 2020 +0700

    Add drop_last for multi gpu

commit b9a50aed48ab1536f94d49269977e2accd67748f
Merge: ec2dc6c 121d90b
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 7 19:48:04 2020 +0800

    Merge branch 'master' of https://github.com/ultralytics/yolov5 into feature/DDP_fixed

commit ec2dc6cc56de43ddff939e14c450672d0fbf9b3d
Merge: d0326e3 82a6182
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 7 19:34:31 2020 +0800

    Merge branch 'feature/DDP_fixed' of https://github.com/MagicFrogSJTU/yolov5 into feature/DDP_fixed

commit d0326e398dfeeeac611ccc64198d4fe91b7aa969
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 7 19:31:24 2020 +0800

    Add SyncBN

commit 82a6182b3ad0689a4432b631b438004e5acb3b74
Merge: 96fa40a 050b2a5
Author: yzchen <Chenyzsjtu@gmail.com>
Date:   Tue Jul 7 19:21:01 2020 +0800

    Merge pull request #1 from NanoCode012/patch-2

    Convert BatchNorm to SyncBatchNorm

commit 050b2a5a79a89c9405854d439a1f70f892139b1c
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 7 12:38:14 2020 +0700

    Add cleanup for process_group

commit 2aa330139f3cc1237aeb3132245ed7e5d6da1683
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 7 12:07:40 2020 +0700

    Remove apex.parallel. Use torch.nn.parallel

    For future compatibility

commit 77c8e27e603bea9a69e7647587ca8d509dc1990d
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 7 01:54:39 2020 +0700

    Convert BatchNorm to SyncBatchNorm

commit 96fa40a3a925e4ffd815fe329e1b5181ec92adc8
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Mon Jul 6 21:53:56 2020 +0800

    Fix the datset inconsistency problem

commit 16e7c269d062c8d16c4d4ff70cc80fd87935dc95
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Mon Jul 6 11:34:03 2020 +0800

    Add loss multiplication to preserver the single-process performance

commit e83805563065ffd2e38f85abe008fc662cc17909
Merge: 625bb49 3bdea3f
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Fri Jul 3 20:56:30 2020 +0800

    Merge branch 'master' of https://github.com/ultralytics/yolov5 into feature/DDP_fixed

commit 625bb49f4e52d781143fea0af36d14e5be8b040c
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 2 22:45:15 2020 +0800

    DDP established

* Squashed commit of the following:

commit 94147314e559a6bdd13cb9de62490d385c27596f
Merge: 65157e2 37acbdc
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 16 14:00:17 2020 +0800

    Merge branch 'master' of https://github.com/ultralytics/yolov4 into feature/DDP_fixed

commit 37acbdc0b6
Author: Glenn Jocher <glenn.jocher@ultralytics.com>
Date:   Wed Jul 15 20:03:41 2020 -0700

    update test.py --save-txt

commit b8c2da4a0d
Author: Glenn Jocher <glenn.jocher@ultralytics.com>
Date:   Wed Jul 15 20:00:48 2020 -0700

    update test.py --save-txt

commit 65157e2fc97d371bc576e18b424e130eb3026917
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Wed Jul 15 16:44:13 2020 +0800

    Revert the README.md removal

commit 1c802bfa503623661d8617ca3f259835d27c5345
Merge: cd55b44 0f3b8bb
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Wed Jul 15 16:43:38 2020 +0800

    Merge branch 'feature/DDP_fixed' of https://github.com/MagicFrogSJTU/yolov5 into feature/DDP_fixed

commit cd55b445c4dcd8003ff4b0b46b64adf7c16e5ce7
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Wed Jul 15 16:42:33 2020 +0800

    fix the DDP performance deterioration bug.

commit 0f3b8bb1fae5885474ba861bbbd1924fb622ee93
Author: Glenn Jocher <glenn.jocher@ultralytics.com>
Date:   Wed Jul 15 00:28:53 2020 -0700

    Delete README.md

commit f5921ba1e35475f24b062456a890238cb7a3cf94
Merge: 85ab2f3 bd3fdbb
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Wed Jul 15 11:20:17 2020 +0800

    Merge branch 'feature/DDP_fixed' of https://github.com/MagicFrogSJTU/yolov5 into feature/DDP_fixed

commit bd3fdbbf1b08ef87931eef49fa8340621caa7e87
Author: Glenn Jocher <glenn.jocher@ultralytics.com>
Date:   Tue Jul 14 18:38:20 2020 -0700

    Update README.md

commit c1a97a7767ccb2aa9afc7a5e72fd159e7c62ec02
Merge: 2bf86b8 f796708
Author: Glenn Jocher <glenn.jocher@ultralytics.com>
Date:   Tue Jul 14 18:36:53 2020 -0700

    Merge branch 'master' into feature/DDP_fixed

commit 2bf86b892fa2fd712f6530903a0d9b8533d7447a
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 22:18:15 2020 +0700

    Fixed world_size not found when called from test

commit 85ab2f38cdda28b61ad15a3a5a14c3aafb620dc8
Merge: 5a19011 c8357ad
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 22:19:58 2020 +0800

    Merge branch 'feature/DDP_fixed' of https://github.com/MagicFrogSJTU/yolov5 into feature/DDP_fixed

commit 5a19011949398d06e744d8d5521ab4e6dfa06ab7
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 22:19:15 2020 +0800

    Add assertion for <=2 gpus DDP

commit c8357ad5b15a0e6aeef4d7fe67ca9637f7322a4d
Merge: e742dd9 787582f
Author: yzchen <Chenyzsjtu@gmail.com>
Date:   Tue Jul 14 22:10:02 2020 +0800

    Merge pull request #8 from MagicFrogSJTU/NanoCode012-patch-1

    Modify number of dataloaders' workers

commit 787582f97251834f955ef05a77072b8c673a8397
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 20:38:58 2020 +0700

    Fixed issue with single gpu not having world_size

commit 63648925288d63a21174a4dd28f92dbfebfeb75a
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 19:16:15 2020 +0700

    Add assert message for clarification

    Clarify why assertion was thrown to users

commit 69364d6050e048d0d8834e0f30ce84da3f6a13f3
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 17:36:48 2020 +0700

    Changed number of workers check

commit d738487089e41c22b3b1cd73aa7c1c40320a6ebf
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 17:33:38 2020 +0700

    Adding world_size

    Reduce calls to torch.distributed. For use in create_dataloader.

commit e742dd9619d29306c7541821238d3d7cddcdc508
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 15:38:48 2020 +0800

    Make SyncBN a choice

commit e90d4004387e6103fecad745f8cbc2edc918e906
Merge: 5bf8beb cd90360
Author: yzchen <Chenyzsjtu@gmail.com>
Date:   Tue Jul 14 15:32:10 2020 +0800

    Merge pull request #6 from NanoCode012/patch-5

    Update train.py

commit cd9036017e7f8bd519a8b62adab0f47ea67f4962
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 14 13:39:29 2020 +0700

    Update train.py

    Remove redundant `opt.` prefix.

commit 5bf8bebe8873afb18b762fe1f409aca116fac073
Merge: c9558a9 a1c8406
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 14:09:51 2020 +0800

    Merge branch 'master' of https://github.com/ultralytics/yolov5 into feature/DDP_fixed

commit c9558a9b51547febb03d9c1ca42e2ef0fc15bb31
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 14 13:51:34 2020 +0800

    Add device allocation for loss compute

commit 4f08c692fb5e943a89e0ee354ef6c80a50eeb28d
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 9 11:16:27 2020 +0800

    Revert drop_last

commit 1dabe33a5a223b758cc761fc8741c6224205a34b
Merge: a1ce9b1 4b8450b
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 9 11:15:49 2020 +0800

    Merge branch 'feature/DDP_fixed' of https://github.com/MagicFrogSJTU/yolov5 into feature/DDP_fixed

commit a1ce9b1e96b71d7fcb9d3e8143013eb8cebe5e27
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 9 11:15:21 2020 +0800

    fix lr warning

commit 4b8450b46db76e5e58cd95df965d4736077cfb0e
Merge: b9a50ae 02c63ef
Author: yzchen <Chenyzsjtu@gmail.com>
Date:   Wed Jul 8 21:24:24 2020 +0800

    Merge pull request #4 from NanoCode012/patch-4

    Add drop_last for multi gpu

commit 02c63ef81cf98b28b10344fe2cce08a03b143941
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Wed Jul 8 10:08:30 2020 +0700

    Add drop_last for multi gpu

commit b9a50aed48ab1536f94d49269977e2accd67748f
Merge: ec2dc6c 121d90b
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 7 19:48:04 2020 +0800

    Merge branch 'master' of https://github.com/ultralytics/yolov5 into feature/DDP_fixed

commit ec2dc6cc56de43ddff939e14c450672d0fbf9b3d
Merge: d0326e3 82a6182
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 7 19:34:31 2020 +0800

    Merge branch 'feature/DDP_fixed' of https://github.com/MagicFrogSJTU/yolov5 into feature/DDP_fixed

commit d0326e398dfeeeac611ccc64198d4fe91b7aa969
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Tue Jul 7 19:31:24 2020 +0800

    Add SyncBN

commit 82a6182b3ad0689a4432b631b438004e5acb3b74
Merge: 96fa40a 050b2a5
Author: yzchen <Chenyzsjtu@gmail.com>
Date:   Tue Jul 7 19:21:01 2020 +0800

    Merge pull request #1 from NanoCode012/patch-2

    Convert BatchNorm to SyncBatchNorm

commit 050b2a5a79a89c9405854d439a1f70f892139b1c
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 7 12:38:14 2020 +0700

    Add cleanup for process_group

commit 2aa330139f3cc1237aeb3132245ed7e5d6da1683
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 7 12:07:40 2020 +0700

    Remove apex.parallel. Use torch.nn.parallel

    For future compatibility

commit 77c8e27e603bea9a69e7647587ca8d509dc1990d
Author: NanoCode012 <kevinvong@rocketmail.com>
Date:   Tue Jul 7 01:54:39 2020 +0700

    Convert BatchNorm to SyncBatchNorm

commit 96fa40a3a925e4ffd815fe329e1b5181ec92adc8
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Mon Jul 6 21:53:56 2020 +0800

    Fix the datset inconsistency problem

commit 16e7c269d062c8d16c4d4ff70cc80fd87935dc95
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Mon Jul 6 11:34:03 2020 +0800

    Add loss multiplication to preserver the single-process performance

commit e83805563065ffd2e38f85abe008fc662cc17909
Merge: 625bb49 3bdea3f
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Fri Jul 3 20:56:30 2020 +0800

    Merge branch 'master' of https://github.com/ultralytics/yolov5 into feature/DDP_fixed

commit 625bb49f4e52d781143fea0af36d14e5be8b040c
Author: yizhi.chen <chenyzsjtu@outlook.com>
Date:   Thu Jul 2 22:45:15 2020 +0800

    DDP established

* Fixed destroy_process_group in DP mode

* Update torch_utils.py

* Update utils.py

Revert build_targets() to current master.

* Update datasets.py

* Fixed world_size attribute not found

Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>
pull/1/head
yzchen 5 years ago committed by GitHub
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commit 4102fcc9a7
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3 changed files with 243 additions and 153 deletions
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164
train.py
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@ -1,11 +1,13 @@
import argparse import argparse
import torch
import torch.distributed as dist import torch.distributed as dist
import torch.nn.functional as F import torch.nn.functional as F
import torch.optim as optim import torch.optim as optim
import torch.optim.lr_scheduler as lr_scheduler import torch.optim.lr_scheduler as lr_scheduler
import torch.utils.data import torch.utils.data
from torch.utils.tensorboard import SummaryWriter from torch.utils.tensorboard import SummaryWriter
from torch.nn.parallel import DistributedDataParallel as DDP
import test # import test.py to get mAP after each epoch import test # import test.py to get mAP after each epoch
from models.yolo import Model from models.yolo import Model
@ -42,7 +44,7 @@ hyp = {'optimizer': 'SGD', # ['adam', 'SGD', None] if none, default is SGD
'shear': 0.0} # image shear (+/- deg) 'shear': 0.0} # image shear (+/- deg)
def train(hyp): def train(hyp, tb_writer, opt, device):
print(f'Hyperparameters {hyp}') print(f'Hyperparameters {hyp}')
log_dir = tb_writer.log_dir if tb_writer else 'runs/evolution' # run directory log_dir = tb_writer.log_dir if tb_writer else 'runs/evolution' # run directory
wdir = str(Path(log_dir) / 'weights') + os.sep # weights directory wdir = str(Path(log_dir) / 'weights') + os.sep # weights directory
@ -59,11 +61,16 @@ def train(hyp):
yaml.dump(vars(opt), f, sort_keys=False) yaml.dump(vars(opt), f, sort_keys=False)
epochs = opt.epochs # 300 epochs = opt.epochs # 300
batch_size = opt.batch_size # 64 batch_size = opt.batch_size # batch size per process.
total_batch_size = opt.total_batch_size
weights = opt.weights # initial training weights weights = opt.weights # initial training weights
local_rank = opt.local_rank
# TODO: Init DDP logging. Only the first process is allowed to log.
# Since I see lots of print here, the logging configuration is skipped here. We may see repeated outputs.
# Configure # Configure
init_seeds(1) init_seeds(2+local_rank)
with open(opt.data) as f: with open(opt.data) as f:
data_dict = yaml.load(f, Loader=yaml.FullLoader) # model dict data_dict = yaml.load(f, Loader=yaml.FullLoader) # model dict
train_path = data_dict['train'] train_path = data_dict['train']
@ -72,6 +79,7 @@ def train(hyp):
assert len(names) == nc, '%g names found for nc=%g dataset in %s' % (len(names), nc, opt.data) # check assert len(names) == nc, '%g names found for nc=%g dataset in %s' % (len(names), nc, opt.data) # check
# Remove previous results # Remove previous results
if local_rank in [-1, 0]:
for f in glob.glob('*_batch*.jpg') + glob.glob(results_file): for f in glob.glob('*_batch*.jpg') + glob.glob(results_file):
os.remove(f) os.remove(f)
@ -84,8 +92,15 @@ def train(hyp):
# Optimizer # Optimizer
nbs = 64 # nominal batch size nbs = 64 # nominal batch size
accumulate = max(round(nbs / batch_size), 1) # accumulate loss before optimizing # the default DDP implementation is slow for accumulation according to: https://pytorch.org/docs/stable/notes/ddp.html
hyp['weight_decay'] *= batch_size * accumulate / nbs # scale weight_decay # all-reduce operation is carried out during loss.backward().
# Thus, there would be redundant all-reduce communications in a accumulation procedure,
# which means, the result is still right but the training speed gets slower.
# TODO: If acceleration is needed, there is an implementation of allreduce_post_accumulation
# in https://github.com/NVIDIA/DeepLearningExamples/blob/master/PyTorch/LanguageModeling/BERT/run_pretraining.py
accumulate = max(round(nbs / total_batch_size), 1) # accumulate loss before optimizing
hyp['weight_decay'] *= total_batch_size * accumulate / nbs # scale weight_decay
pg0, pg1, pg2 = [], [], [] # optimizer parameter groups pg0, pg1, pg2 = [], [], [] # optimizer parameter groups
for k, v in model.named_parameters(): for k, v in model.named_parameters():
if v.requires_grad: if v.requires_grad:
@ -106,12 +121,9 @@ def train(hyp):
print('Optimizer groups: %g .bias, %g conv.weight, %g other' % (len(pg2), len(pg1), len(pg0))) print('Optimizer groups: %g .bias, %g conv.weight, %g other' % (len(pg2), len(pg1), len(pg0)))
del pg0, pg1, pg2 del pg0, pg1, pg2
# Scheduler https://arxiv.org/pdf/1812.01187.pdf
lf = lambda x: (((1 + math.cos(x * math.pi / epochs)) / 2) ** 1.0) * 0.9 + 0.1 # cosine
scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)
# plot_lr_scheduler(optimizer, scheduler, epochs, save_dir=log_dir)
# Load Model # Load Model
# Avoid multiple downloads.
with torch_distributed_zero_first(local_rank):
google_utils.attempt_download(weights) google_utils.attempt_download(weights)
start_epoch, best_fitness = 0, 0.0 start_epoch, best_fitness = 0, 0.0
if weights.endswith('.pt'): # pytorch format if weights.endswith('.pt'): # pytorch format
@ -124,7 +136,7 @@ def train(hyp):
except KeyError as e: except KeyError as e:
s = "%s is not compatible with %s. This may be due to model differences or %s may be out of date. " \ s = "%s is not compatible with %s. This may be due to model differences or %s may be out of date. " \
"Please delete or update %s and try again, or use --weights '' to train from scratch." \ "Please delete or update %s and try again, or use --weights '' to train from scratch." \
% (opt.weights, opt.cfg, opt.weights, opt.weights) % (weights, opt.cfg, weights, weights)
raise KeyError(s) from e raise KeyError(s) from e
# load optimizer # load optimizer
@ -141,7 +153,7 @@ def train(hyp):
start_epoch = ckpt['epoch'] + 1 start_epoch = ckpt['epoch'] + 1
if epochs < start_epoch: if epochs < start_epoch:
print('%s has been trained for %g epochs. Fine-tuning for %g additional epochs.' % print('%s has been trained for %g epochs. Fine-tuning for %g additional epochs.' %
(opt.weights, ckpt['epoch'], epochs)) (weights, ckpt['epoch'], epochs))
epochs += ckpt['epoch'] # finetune additional epochs epochs += ckpt['epoch'] # finetune additional epochs
del ckpt del ckpt
@ -150,25 +162,41 @@ def train(hyp):
if mixed_precision: if mixed_precision:
model, optimizer = amp.initialize(model, optimizer, opt_level='O1', verbosity=0) model, optimizer = amp.initialize(model, optimizer, opt_level='O1', verbosity=0)
# Distributed training # Scheduler https://arxiv.org/pdf/1812.01187.pdf
if device.type != 'cpu' and torch.cuda.device_count() > 1 and dist.is_available(): lf = lambda x: (((1 + math.cos(x * math.pi / epochs)) / 2) ** 1.0) * 0.9 + 0.1 # cosine
dist.init_process_group(backend='nccl', # distributed backend scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)
init_method='tcp://127.0.0.1:9999', # init method # https://discuss.pytorch.org/t/a-problem-occured-when-resuming-an-optimizer/28822
world_size=1, # number of nodes # plot_lr_scheduler(optimizer, scheduler, epochs)
rank=0) # node rank
# model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device) # requires world_size > 1 # DP mode
model = torch.nn.parallel.DistributedDataParallel(model) if device.type != 'cpu' and local_rank == -1 and torch.cuda.device_count() > 1:
model = torch.nn.DataParallel(model)
# Exponential moving average
# From https://github.com/rwightman/pytorch-image-models/blob/master/train.py:
# "Important to create EMA model after cuda(), DP wrapper, and AMP but before SyncBN and DDP wrapper"
# chenyzsjtu: ema should be placed before after SyncBN. As SyncBN introduces new modules.
if opt.sync_bn and device.type != 'cpu' and local_rank != -1:
print("SyncBN activated!")
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device)
ema = torch_utils.ModelEMA(model) if local_rank in [-1, 0] else None
# DDP mode
if device.type != 'cpu' and local_rank != -1:
model = DDP(model, device_ids=[local_rank], output_device=local_rank)
# Trainloader # Trainloader
dataloader, dataset = create_dataloader(train_path, imgsz, batch_size, gs, opt, dataloader, dataset = create_dataloader(train_path, imgsz, batch_size, gs, opt, hyp=hyp, augment=True,
hyp=hyp, augment=True, cache=opt.cache_images, rect=opt.rect) cache=opt.cache_images, rect=opt.rect, local_rank=local_rank, world_size=opt.world_size)
mlc = np.concatenate(dataset.labels, 0)[:, 0].max() # max label class mlc = np.concatenate(dataset.labels, 0)[:, 0].max() # max label class
nb = len(dataloader) # number of batches nb = len(dataloader) # number of batches
assert mlc < nc, 'Label class %g exceeds nc=%g in %s. Possible class labels are 0-%g' % (mlc, nc, opt.data, nc - 1) assert mlc < nc, 'Label class %g exceeds nc=%g in %s. Possible class labels are 0-%g' % (mlc, nc, opt.data, nc - 1)
# Testloader # Testloader
testloader = create_dataloader(test_path, imgsz_test, batch_size, gs, opt, if local_rank in [-1, 0]:
hyp=hyp, augment=False, cache=opt.cache_images, rect=True)[0] # local_rank is set to -1. Because only the first process is expected to do evaluation.
testloader = create_dataloader(test_path, imgsz_test, total_batch_size, gs, opt, hyp=hyp, augment=False,
cache=opt.cache_images, rect=True, local_rank=-1, world_size=opt.world_size)[0]
# Model parameters # Model parameters
hyp['cls'] *= nc / 80. # scale coco-tuned hyp['cls'] to current dataset hyp['cls'] *= nc / 80. # scale coco-tuned hyp['cls'] to current dataset
@ -179,6 +207,8 @@ def train(hyp):
model.names = names model.names = names
# Class frequency # Class frequency
# Only one check and log is needed.
if local_rank in [-1, 0]:
labels = np.concatenate(dataset.labels, 0) labels = np.concatenate(dataset.labels, 0)
c = torch.tensor(labels[:, 0]) # classes c = torch.tensor(labels[:, 0]) # classes
# cf = torch.bincount(c.long(), minlength=nc) + 1. # cf = torch.bincount(c.long(), minlength=nc) + 1.
@ -191,16 +221,13 @@ def train(hyp):
# Check anchors # Check anchors
if not opt.noautoanchor: if not opt.noautoanchor:
check_anchors(dataset, model=model, thr=hyp['anchor_t'], imgsz=imgsz) check_anchors(dataset, model=model, thr=hyp['anchor_t'], imgsz=imgsz)
# Exponential moving average
ema = torch_utils.ModelEMA(model)
# Start training # Start training
t0 = time.time() t0 = time.time()
nw = max(3 * nb, 1e3) # number of warmup iterations, max(3 epochs, 1k iterations) nw = max(3 * nb, 1e3) # number of warmup iterations, max(3 epochs, 1k iterations)
maps = np.zeros(nc) # mAP per class maps = np.zeros(nc) # mAP per class
results = (0, 0, 0, 0, 0, 0, 0) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification' results = (0, 0, 0, 0, 0, 0, 0) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification'
scheduler.last_epoch = start_epoch - 1 # do not move scheduler.last_epoch = start_epoch - 1 # do not move
if local_rank in [0, -1]:
print('Image sizes %g train, %g test' % (imgsz, imgsz_test)) print('Image sizes %g train, %g test' % (imgsz, imgsz_test))
print('Using %g dataloader workers' % dataloader.num_workers) print('Using %g dataloader workers' % dataloader.num_workers)
print('Starting training for %g epochs...' % epochs) print('Starting training for %g epochs...' % epochs)
@ -209,18 +236,34 @@ def train(hyp):
model.train() model.train()
# Update image weights (optional) # Update image weights (optional)
# When in DDP mode, the generated indices will be broadcasted to synchronize dataset.
if dataset.image_weights: if dataset.image_weights:
# Generate indices.
if local_rank in [-1, 0]:
w = model.class_weights.cpu().numpy() * (1 - maps) ** 2 # class weights w = model.class_weights.cpu().numpy() * (1 - maps) ** 2 # class weights
image_weights = labels_to_image_weights(dataset.labels, nc=nc, class_weights=w) image_weights = labels_to_image_weights(dataset.labels, nc=nc, class_weights=w)
dataset.indices = random.choices(range(dataset.n), weights=image_weights, k=dataset.n) # rand weighted idx dataset.indices = random.choices(range(dataset.n), weights=image_weights, k=dataset.n) # rand weighted idx
# Broadcast.
if local_rank != -1:
indices = torch.zeros([dataset.n], dtype=torch.int)
if local_rank == 0:
indices[:] = torch.from_tensor(dataset.indices, dtype=torch.int)
dist.broadcast(indices, 0)
if local_rank != 0:
dataset.indices = indices.cpu().numpy()
# Update mosaic border # Update mosaic border
# b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs) # b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs)
# dataset.mosaic_border = [b - imgsz, -b] # height, width borders # dataset.mosaic_border = [b - imgsz, -b] # height, width borders
mloss = torch.zeros(4, device=device) # mean losses mloss = torch.zeros(4, device=device) # mean losses
if local_rank != -1:
dataloader.sampler.set_epoch(epoch)
pbar = enumerate(dataloader)
if local_rank in [-1, 0]:
print(('\n' + '%10s' * 8) % ('Epoch', 'gpu_mem', 'GIoU', 'obj', 'cls', 'total', 'targets', 'img_size')) print(('\n' + '%10s' * 8) % ('Epoch', 'gpu_mem', 'GIoU', 'obj', 'cls', 'total', 'targets', 'img_size'))
pbar = tqdm(enumerate(dataloader), total=nb) # progress bar pbar = tqdm(pbar, total=nb) # progress bar
optimizer.zero_grad()
for i, (imgs, targets, paths, _) in pbar: # batch ------------------------------------------------------------- for i, (imgs, targets, paths, _) in pbar: # batch -------------------------------------------------------------
ni = i + nb * epoch # number integrated batches (since train start) ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device, non_blocking=True).float() / 255.0 # uint8 to float32, 0 - 255 to 0.0 - 1.0 imgs = imgs.to(device, non_blocking=True).float() / 255.0 # uint8 to float32, 0 - 255 to 0.0 - 1.0
@ -229,7 +272,7 @@ def train(hyp):
if ni <= nw: if ni <= nw:
xi = [0, nw] # x interp xi = [0, nw] # x interp
# model.gr = np.interp(ni, xi, [0.0, 1.0]) # giou loss ratio (obj_loss = 1.0 or giou) # model.gr = np.interp(ni, xi, [0.0, 1.0]) # giou loss ratio (obj_loss = 1.0 or giou)
accumulate = max(1, np.interp(ni, xi, [1, nbs / batch_size]).round()) accumulate = max(1, np.interp(ni, xi, [1, nbs / total_batch_size]).round())
for j, x in enumerate(optimizer.param_groups): for j, x in enumerate(optimizer.param_groups):
# bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0 # bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0
x['lr'] = np.interp(ni, xi, [0.1 if j == 2 else 0.0, x['initial_lr'] * lf(epoch)]) x['lr'] = np.interp(ni, xi, [0.1 if j == 2 else 0.0, x['initial_lr'] * lf(epoch)])
@ -249,6 +292,9 @@ def train(hyp):
# Loss # Loss
loss, loss_items = compute_loss(pred, targets.to(device), model) loss, loss_items = compute_loss(pred, targets.to(device), model)
# loss is scaled with batch size in func compute_loss. But in DDP mode, gradient is averaged between devices.
if local_rank != -1:
loss *= opt.world_size
if not torch.isfinite(loss): if not torch.isfinite(loss):
print('WARNING: non-finite loss, ending training ', loss_items) print('WARNING: non-finite loss, ending training ', loss_items)
return results return results
@ -264,9 +310,11 @@ def train(hyp):
if ni % accumulate == 0: if ni % accumulate == 0:
optimizer.step() optimizer.step()
optimizer.zero_grad() optimizer.zero_grad()
if ema is not None:
ema.update(model) ema.update(model)
# Print # Print
if local_rank in [-1, 0]:
mloss = (mloss * i + loss_items) / (i + 1) # update mean losses 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) mem = '%.3gG' % (torch.cuda.memory_cached() / 1E9 if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 + '%10.4g' * 6) % ( s = ('%10s' * 2 + '%10.4g' * 6) % (
@ -286,29 +334,32 @@ def train(hyp):
# Scheduler # Scheduler
scheduler.step() scheduler.step()
# Only the first process in DDP mode is allowed to log or save checkpoints.
if local_rank in [-1, 0]:
# mAP # mAP
if ema is not None:
ema.update_attr(model, include=['md', 'nc', 'hyp', 'gr', 'names', 'stride']) ema.update_attr(model, include=['md', 'nc', 'hyp', 'gr', 'names', 'stride'])
final_epoch = epoch + 1 == epochs final_epoch = epoch + 1 == epochs
if not opt.notest or final_epoch: # Calculate mAP if not opt.notest or final_epoch: # Calculate mAP
results, maps, times = test.test(opt.data, results, maps, times = test.test(opt.data,
batch_size=batch_size, batch_size=total_batch_size,
imgsz=imgsz_test, imgsz=imgsz_test,
save_json=final_epoch and opt.data.endswith(os.sep + 'coco.yaml'), save_json=final_epoch and opt.data.endswith(os.sep + 'coco.yaml'),
model=ema.ema, model=ema.ema.module if hasattr(ema.ema, 'module') else ema.ema,
single_cls=opt.single_cls, single_cls=opt.single_cls,
dataloader=testloader, dataloader=testloader,
save_dir=log_dir) save_dir=log_dir)
# Explicitly keep the shape.
# Write # Write
with open(results_file, 'a') as f: with open(results_file, 'a') as f:
f.write(s + '%10.4g' * 7 % results + '\n') # P, R, mAP, F1, test_losses=(GIoU, obj, cls) f.write(s + '%10.4g' * 7 % results + '\n') # P, R, mAP, F1, test_losses=(GIoU, obj, cls)
if len(opt.name) and opt.bucket: if len(opt.name) and opt.bucket:
os.system('gsutil cp %s gs://%s/results/results%s.txt' % (results_file, opt.bucket, opt.name)) os.system('gsutil cp results.txt gs://%s/results/results%s.txt' % (opt.bucket, opt.name))
# Tensorboard # Tensorboard
if tb_writer: if tb_writer:
tags = ['train/giou_loss', 'train/obj_loss', 'train/cls_loss', tags = ['train/giou_loss', 'train/obj_loss', 'train/cls_loss',
'metrics/precision', 'metrics/recall', 'metrics/mAP_0.5', 'metrics/mAP_0.5:0.95', 'metrics/precision', 'metrics/recall', 'metrics/mAP_0.5', 'metrics/F1',
'val/giou_loss', 'val/obj_loss', 'val/cls_loss'] 'val/giou_loss', 'val/obj_loss', 'val/cls_loss']
for x, tag in zip(list(mloss[:-1]) + list(results), tags): for x, tag in zip(list(mloss[:-1]) + list(results), tags):
tb_writer.add_scalar(tag, x, epoch) tb_writer.add_scalar(tag, x, epoch)
@ -325,7 +376,7 @@ def train(hyp):
ckpt = {'epoch': epoch, ckpt = {'epoch': epoch,
'best_fitness': best_fitness, 'best_fitness': best_fitness,
'training_results': f.read(), 'training_results': f.read(),
'model': ema.ema, 'model': ema.ema.module if hasattr(ema, 'module') else ema.ema,
'optimizer': None if final_epoch else optimizer.state_dict()} 'optimizer': None if final_epoch else optimizer.state_dict()}
# Save last, best and delete # Save last, best and delete
@ -333,10 +384,10 @@ def train(hyp):
if (best_fitness == fi) and not final_epoch: if (best_fitness == fi) and not final_epoch:
torch.save(ckpt, best) torch.save(ckpt, best)
del ckpt del ckpt
# end epoch ---------------------------------------------------------------------------------------------------- # end epoch ----------------------------------------------------------------------------------------------------
# end training # end training
if local_rank in [-1, 0]:
# Strip optimizers # Strip optimizers
n = ('_' if len(opt.name) and not opt.name.isnumeric() else '') + opt.name n = ('_' if len(opt.name) and not opt.name.isnumeric() else '') + opt.name
fresults, flast, fbest = 'results%s.txt' % n, wdir + 'last%s.pt' % n, wdir + 'best%s.pt' % n fresults, flast, fbest = 'results%s.txt' % n, wdir + 'last%s.pt' % n, wdir + 'best%s.pt' % n
@ -346,24 +397,23 @@ def train(hyp):
ispt = f2.endswith('.pt') # is *.pt ispt = f2.endswith('.pt') # is *.pt
strip_optimizer(f2) if ispt else None # strip optimizer strip_optimizer(f2) if ispt else None # strip optimizer
os.system('gsutil cp %s gs://%s/weights' % (f2, opt.bucket)) if opt.bucket and ispt else None # upload os.system('gsutil cp %s gs://%s/weights' % (f2, opt.bucket)) if opt.bucket and ispt else None # upload
# Finish # Finish
if not opt.evolve: if not opt.evolve:
plot_results(save_dir=log_dir) # save as results.png plot_results() # save as results.png
print('%g epochs completed in %.3f hours.\n' % (epoch - start_epoch + 1, (time.time() - t0) / 3600)) print('%g epochs completed in %.3f hours.\n' % (epoch - start_epoch + 1, (time.time() - t0) / 3600))
dist.destroy_process_group() if device.type != 'cpu' and torch.cuda.device_count() > 1 else None
dist.destroy_process_group() if local_rank not in [-1,0] else None
torch.cuda.empty_cache() torch.cuda.empty_cache()
return results return results
if __name__ == '__main__': if __name__ == '__main__':
check_git_status()
parser = argparse.ArgumentParser() parser = argparse.ArgumentParser()
parser.add_argument('--cfg', type=str, default='models/yolov5s.yaml', help='model.yaml path') parser.add_argument('--cfg', type=str, default='models/yolov5s.yaml', help='model.yaml path')
parser.add_argument('--data', type=str, default='data/coco128.yaml', help='data.yaml path') parser.add_argument('--data', type=str, default='data/coco128.yaml', help='data.yaml path')
parser.add_argument('--hyp', type=str, default='', help='hyp.yaml path (optional)') parser.add_argument('--hyp', type=str, default='', help='hyp.yaml path (optional)')
parser.add_argument('--epochs', type=int, default=300) parser.add_argument('--epochs', type=int, default=300)
parser.add_argument('--batch-size', type=int, default=16) parser.add_argument('--batch-size', type=int, default=16, help="Total batch size for all gpus.")
parser.add_argument('--img-size', nargs='+', type=int, default=[640, 640], help='train,test sizes') parser.add_argument('--img-size', nargs='+', type=int, default=[640, 640], help='train,test sizes')
parser.add_argument('--rect', action='store_true', help='rectangular training') parser.add_argument('--rect', action='store_true', help='rectangular training')
parser.add_argument('--resume', nargs='?', const='get_last', default=False, parser.add_argument('--resume', nargs='?', const='get_last', default=False,
@ -379,32 +429,54 @@ if __name__ == '__main__':
parser.add_argument('--device', default='', help='cuda device, i.e. 0 or 0,1,2,3 or cpu') parser.add_argument('--device', default='', help='cuda device, i.e. 0 or 0,1,2,3 or cpu')
parser.add_argument('--multi-scale', action='store_true', help='vary img-size +/- 50%%') parser.add_argument('--multi-scale', action='store_true', help='vary img-size +/- 50%%')
parser.add_argument('--single-cls', action='store_true', help='train as single-class dataset') parser.add_argument('--single-cls', action='store_true', help='train as single-class dataset')
parser.add_argument("--sync-bn", action="store_true", help="Use sync-bn, only avaible in DDP mode.")
# Parameter For DDP.
parser.add_argument('--local_rank', type=int, default=-1, help="Extra parameter for DDP implementation. Don't use it manually.")
opt = parser.parse_args() opt = parser.parse_args()
last = get_latest_run() if opt.resume == 'get_last' else opt.resume # resume from most recent run last = get_latest_run() if opt.resume == 'get_last' else opt.resume # resume from most recent run
if last and not opt.weights: if last and not opt.weights:
print(f'Resuming training from {last}') print(f'Resuming training from {last}')
opt.weights = last if opt.resume and not opt.weights else opt.weights opt.weights = last if opt.resume and not opt.weights else opt.weights
if opt.local_rank in [-1, 0]:
check_git_status()
opt.cfg = check_file(opt.cfg) # check file opt.cfg = check_file(opt.cfg) # check file
opt.data = check_file(opt.data) # check file opt.data = check_file(opt.data) # check file
if opt.hyp: # update hyps if opt.hyp: # update hyps
opt.hyp = check_file(opt.hyp) # check file opt.hyp = check_file(opt.hyp) # check file
with open(opt.hyp) as f: with open(opt.hyp) as f:
hyp.update(yaml.load(f, Loader=yaml.FullLoader)) # update hyps hyp.update(yaml.load(f, Loader=yaml.FullLoader)) # update hyps
print(opt)
opt.img_size.extend([opt.img_size[-1]] * (2 - len(opt.img_size))) # extend to 2 sizes (train, test) opt.img_size.extend([opt.img_size[-1]] * (2 - len(opt.img_size))) # extend to 2 sizes (train, test)
device = torch_utils.select_device(opt.device, apex=mixed_precision, batch_size=opt.batch_size) device = torch_utils.select_device(opt.device, apex=mixed_precision, batch_size=opt.batch_size)
opt.total_batch_size = opt.batch_size
opt.world_size = 1
if device.type == 'cpu': if device.type == 'cpu':
mixed_precision = False mixed_precision = False
elif opt.local_rank != -1:
# DDP mode
assert torch.cuda.device_count() > opt.local_rank
torch.cuda.set_device(opt.local_rank)
device = torch.device("cuda", opt.local_rank)
dist.init_process_group(backend='nccl', init_method='env://') # distributed backend
opt.world_size = dist.get_world_size()
assert opt.batch_size % opt.world_size == 0, "Batch size is not a multiple of the number of devices given!"
opt.batch_size = opt.total_batch_size // opt.world_size
print(opt)
# Train # Train
if not opt.evolve: if not opt.evolve:
tb_writer = SummaryWriter(log_dir=increment_dir('runs/exp', opt.name)) if opt.local_rank in [-1, 0]:
print('Start Tensorboard with "tensorboard --logdir=runs", view at http://localhost:6006/') print('Start Tensorboard with "tensorboard --logdir=runs", view at http://localhost:6006/')
train(hyp) tb_writer = SummaryWriter(log_dir=increment_dir('runs/exp', opt.name))
else:
tb_writer = None
train(hyp, tb_writer, opt, device)
# Evolve hyperparameters (optional) # Evolve hyperparameters (optional)
else: else:
assert opt.local_rank == -1, "DDP mode currently not implemented for Evolve!"
tb_writer = None tb_writer = None
opt.notest, opt.nosave = True, True # only test/save final epoch opt.notest, opt.nosave = True, True # only test/save final epoch
if opt.bucket: if opt.bucket:
@ -443,7 +515,7 @@ if __name__ == '__main__':
hyp[k] = np.clip(hyp[k], v[0], v[1]) hyp[k] = np.clip(hyp[k], v[0], v[1])
# Train mutation # Train mutation
results = train(hyp.copy()) results = train(hyp.copy(), tb_writer, opt, device)
# Write mutation results # Write mutation results
print_mutation(hyp, results, opt.bucket) print_mutation(hyp, results, opt.bucket)

12
utils/datasets.py
Unescape View File

@ -14,7 +14,7 @@ from PIL import Image, ExifTags
from torch.utils.data import Dataset from torch.utils.data import Dataset
from tqdm import tqdm from tqdm import tqdm
from utils.utils import xyxy2xywh, xywh2xyxy from utils.utils import xyxy2xywh, xywh2xyxy, torch_distributed_zero_first
help_url = 'https://github.com/ultralytics/yolov5/wiki/Train-Custom-Data' help_url = 'https://github.com/ultralytics/yolov5/wiki/Train-Custom-Data'
img_formats = ['.bmp', '.jpg', '.jpeg', '.png', '.tif', '.dng'] img_formats = ['.bmp', '.jpg', '.jpeg', '.png', '.tif', '.dng']
@ -46,7 +46,9 @@ def exif_size(img):
return s return s
def create_dataloader(path, imgsz, batch_size, stride, opt, hyp=None, augment=False, cache=False, pad=0.0, rect=False): def create_dataloader(path, imgsz, batch_size, stride, opt, hyp=None, augment=False, cache=False, pad=0.0, rect=False, local_rank=-1, world_size=1):
# Make sure only the first process in DDP process the dataset first, and the following others can use the cache.
with torch_distributed_zero_first(local_rank):
dataset = LoadImagesAndLabels(path, imgsz, batch_size, dataset = LoadImagesAndLabels(path, imgsz, batch_size,
augment=augment, # augment images augment=augment, # augment images
hyp=hyp, # augmentation hyperparameters hyp=hyp, # augmentation hyperparameters
@ -57,10 +59,12 @@ def create_dataloader(path, imgsz, batch_size, stride, opt, hyp=None, augment=Fa
pad=pad) pad=pad)
batch_size = min(batch_size, len(dataset)) batch_size = min(batch_size, len(dataset))
nw = min([os.cpu_count(), batch_size if batch_size > 1 else 0, 8]) # number of workers nw = min([os.cpu_count() // world_size, batch_size if batch_size > 1 else 0, 8]) # number of workers
train_sampler = torch.utils.data.distributed.DistributedSampler(dataset) if local_rank != -1 else None
dataloader = torch.utils.data.DataLoader(dataset, dataloader = torch.utils.data.DataLoader(dataset,
batch_size=batch_size, batch_size=batch_size,
num_workers=nw, num_workers=nw,
sampler=train_sampler,
pin_memory=True, pin_memory=True,
collate_fn=LoadImagesAndLabels.collate_fn) collate_fn=LoadImagesAndLabels.collate_fn)
return dataloader, dataset return dataloader, dataset
@ -301,7 +305,7 @@ class LoadImagesAndLabels(Dataset): # for training/testing
f += glob.iglob(p + os.sep + '*.*') f += glob.iglob(p + os.sep + '*.*')
else: else:
raise Exception('%s does not exist' % p) raise Exception('%s does not exist' % p)
self.img_files = [x.replace('/', os.sep) for x in f if os.path.splitext(x)[-1].lower() in img_formats] self.img_files = sorted([x.replace('/', os.sep) for x in f if os.path.splitext(x)[-1].lower() in img_formats])
except Exception as e: except Exception as e:
raise Exception('Error loading data from %s: %s\nSee %s' % (path, e, help_url)) raise Exception('Error loading data from %s: %s\nSee %s' % (path, e, help_url))

26
utils/utils.py
Unescape View File

@ -8,6 +8,7 @@ import time
from copy import copy from copy import copy
from pathlib import Path from pathlib import Path
from sys import platform from sys import platform
from contextlib import contextmanager
import cv2 import cv2
import matplotlib import matplotlib
@ -31,6 +32,18 @@ matplotlib.rc('font', **{'size': 11})
cv2.setNumThreads(0) cv2.setNumThreads(0)
@contextmanager
def torch_distributed_zero_first(local_rank: int):
"""
Decorator to make all processes in distributed training wait for each local_master to do something.
"""
if local_rank not in [-1, 0]:
torch.distributed.barrier()
yield
if local_rank == 0:
torch.distributed.barrier()
def init_seeds(seed=0): def init_seeds(seed=0):
random.seed(seed) random.seed(seed)
np.random.seed(seed) np.random.seed(seed)
@ -424,15 +437,16 @@ class BCEBlurWithLogitsLoss(nn.Module):
def compute_loss(p, targets, model): # predictions, targets, model def compute_loss(p, targets, model): # predictions, targets, model
device = targets.device
ft = torch.cuda.FloatTensor if p[0].is_cuda else torch.Tensor ft = torch.cuda.FloatTensor if p[0].is_cuda else torch.Tensor
lcls, lbox, lobj = ft([0]), ft([0]), ft([0]) lcls, lbox, lobj = ft([0]).to(device), ft([0]).to(device), ft([0]).to(device)
tcls, tbox, indices, anchors = build_targets(p, targets, model) # targets tcls, tbox, indices, anchors = build_targets(p, targets, model) # targets
h = model.hyp # hyperparameters h = model.hyp # hyperparameters
red = 'mean' # Loss reduction (sum or mean) red = 'mean' # Loss reduction (sum or mean)
# Define criteria # Define criteria
BCEcls = nn.BCEWithLogitsLoss(pos_weight=ft([h['cls_pw']]), reduction=red) BCEcls = nn.BCEWithLogitsLoss(pos_weight=ft([h['cls_pw']]), reduction=red).to(device)
BCEobj = nn.BCEWithLogitsLoss(pos_weight=ft([h['obj_pw']]), reduction=red) BCEobj = nn.BCEWithLogitsLoss(pos_weight=ft([h['obj_pw']]), reduction=red).to(device)
# class label smoothing https://arxiv.org/pdf/1902.04103.pdf eqn 3 # class label smoothing https://arxiv.org/pdf/1902.04103.pdf eqn 3
cp, cn = smooth_BCE(eps=0.0) cp, cn = smooth_BCE(eps=0.0)
@ -448,7 +462,7 @@ def compute_loss(p, targets, model): # predictions, targets, model
balance = [1.0, 1.0, 1.0] balance = [1.0, 1.0, 1.0]
for i, pi in enumerate(p): # layer index, layer predictions for i, pi in enumerate(p): # layer index, layer predictions
b, a, gj, gi = indices[i] # image, anchor, gridy, gridx b, a, gj, gi = indices[i] # image, anchor, gridy, gridx
tobj = torch.zeros_like(pi[..., 0]) # target obj tobj = torch.zeros_like(pi[..., 0]).to(device) # target obj
nb = b.shape[0] # number of targets nb = b.shape[0] # number of targets
if nb: if nb:
@ -458,7 +472,7 @@ def compute_loss(p, targets, model): # predictions, targets, model
# GIoU # GIoU
pxy = ps[:, :2].sigmoid() * 2. - 0.5 pxy = ps[:, :2].sigmoid() * 2. - 0.5
pwh = (ps[:, 2:4].sigmoid() * 2) ** 2 * anchors[i] pwh = (ps[:, 2:4].sigmoid() * 2) ** 2 * anchors[i]
pbox = torch.cat((pxy, pwh), 1) # predicted box pbox = torch.cat((pxy, pwh), 1).to(device) # predicted box
giou = bbox_iou(pbox.t(), tbox[i], x1y1x2y2=False, GIoU=True) # giou(prediction, target) giou = bbox_iou(pbox.t(), tbox[i], x1y1x2y2=False, GIoU=True) # giou(prediction, target)
lbox += (1.0 - giou).sum() if red == 'sum' else (1.0 - giou).mean() # giou loss lbox += (1.0 - giou).sum() if red == 'sum' else (1.0 - giou).mean() # giou loss
@ -467,7 +481,7 @@ def compute_loss(p, targets, model): # predictions, targets, model
# Class # Class
if model.nc > 1: # cls loss (only if multiple classes) if model.nc > 1: # cls loss (only if multiple classes)
t = torch.full_like(ps[:, 5:], cn) # targets t = torch.full_like(ps[:, 5:], cn).to(device) # targets
t[range(nb), tcls[i]] = cp t[range(nb), tcls[i]] = cp
lcls += BCEcls(ps[:, 5:], t) # BCE lcls += BCEcls(ps[:, 5:], t) # BCE

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