def test_find_latest_checkpoint():
with tempfile.TemporaryDirectory() as tmpdir:
path = tmpdir
latest = find_latest_checkpoint(path)
# There are no checkpoints in the path.
assert latest is None
path = tmpdir + '/none'
latest = find_latest_checkpoint(path)
# The path does not exist.
assert latest is None
with tempfile.TemporaryDirectory() as tmpdir:
with open(tmpdir + '/latest.pth', 'w') as f:
f.write('latest')
path = tmpdir
latest = find_latest_checkpoint(path)
assert latest == tmpdir + '/latest.pth'
with tempfile.TemporaryDirectory() as tmpdir:
with open(tmpdir + '/iter_4000.pth', 'w') as f:
f.write('iter_4000')
with open(tmpdir + '/iter_8000.pth', 'w') as f:
f.write('iter_8000')
path = tmpdir
latest = find_latest_checkpoint(path)
assert latest == tmpdir + '/iter_8000.pth'
with tempfile.TemporaryDirectory() as tmpdir:
with open(tmpdir + '/epoch_1.pth', 'w') as f:
f.write('epoch_1')
with open(tmpdir + '/epoch_2.pth', 'w') as f:
f.write('epoch_2')
path = tmpdir
latest = find_latest_checkpoint(path)
assert latest == tmpdir + '/epoch_2.pth'
def train_detector(model,
dataset,
cfg,
distributed=False,
validate=False,
timestamp=None,
meta=None):
cfg = compat_cfg(cfg)
logger = get_root_logger(log_level=cfg.log_level)
use_apex = cfg.optimizer_config.get('type', None) == 'ApexOptimizerHook'
# prepare data loaders
dataset = dataset if isinstance(dataset, (list, tuple)) else [dataset]
runner_type = 'EpochBasedRunner' if 'runner' not in cfg else cfg.runner[
'type']
train_dataloader_default_args = dict(
samples_per_gpu=2,
workers_per_gpu=2,
# `num_gpus` will be ignored if distributed
num_gpus=len(cfg.gpu_ids),
dist=distributed,
seed=cfg.seed,
runner_type=runner_type,
persistent_workers=False)
train_loader_cfg = {
**train_dataloader_default_args,
**cfg.data.get('train_dataloader', {})
}
data_loaders = [build_dataloader(ds, **train_loader_cfg) for ds in dataset]
auto_scale_lr(cfg, distributed, logger)
# use apex fp16 optimizer
if use_apex:
if apex is None:
raise RuntimeError('apex is not installed')
optimizer = build_optimizer(model, cfg.optimizer)
if cfg.optimizer_config.get('use_fp16', False):
model, optimizer = apex.amp.initialize(model.cuda(),
optimizer,
opt_level='O1')
for m in model.modules():
if hasattr(m, 'fp16_enabled'):
m.fp16_enabled = True
# put model on gpus
if distributed:
find_unused_parameters = cfg.get('find_unused_parameters', False)
# Sets the `find_unused_parameters` parameter in
# torch.nn.parallel.DistributedDataParallel
model = build_ddp(model,
cfg.device,
device_ids=[int(os.environ['LOCAL_RANK'])],
broadcast_buffers=False,
find_unused_parameters=find_unused_parameters)
else:
model = build_dp(model, cfg.device, device_ids=cfg.gpu_ids)
# build optimizer
if not use_apex:
optimizer = build_optimizer(model, cfg.optimizer)
# build runner
runner = build_runner(cfg.runner,
default_args=dict(model=model,
optimizer=optimizer,
work_dir=cfg.work_dir,
logger=logger,
meta=meta))
# an ugly workaround to make .log and .log.json filenames the same
runner.timestamp = timestamp
# fp16 setting
fp16_cfg = cfg.get('fp16', None)
# gradient accumulation
if 'cumulative_iters' in cfg.optimizer_config:
if fp16_cfg is not None:
optimizer_config = GradientCumulativeFp16OptimizerHook(
**cfg.optimizer_config, **fp16_cfg, distributed=distributed)
elif distributed and 'type' not in cfg.optimizer_config:
optimizer_config = DebugGradientCumulativeOptimizerHook(
**cfg.optimizer_config)
else:
optimizer_config = cfg.optimizer_config
else:
if fp16_cfg is not None:
optimizer_config = Fp16OptimizerHook(**cfg.optimizer_config,
**fp16_cfg,
distributed=distributed)
elif distributed and 'type' not in cfg.optimizer_config:
optimizer_config = OptimizerHook(**cfg.optimizer_config)
else:
optimizer_config = cfg.optimizer_config
# register hooks
runner.register_training_hooks(cfg.lr_config,
optimizer_config,
cfg.checkpoint_config,
cfg.log_config,
cfg.get('momentum_config', None),
custom_hooks_config=cfg.get(
'custom_hooks', None))
if distributed:
if isinstance(runner, EpochBasedRunner):
runner.register_hook(DistSamplerSeedHook())
# register eval hooks
if validate:
val_dataloader_default_args = dict(samples_per_gpu=1,
workers_per_gpu=2,
dist=distributed,
shuffle=False,
persistent_workers=False)
val_dataloader_args = {
**val_dataloader_default_args,
**cfg.data.get('val_dataloader', {})
}
# Support batch_size > 1 in validation
if val_dataloader_args['samples_per_gpu'] > 1:
# Replace 'ImageToTensor' to 'DefaultFormatBundle'
cfg.data.val.pipeline = replace_ImageToTensor(
cfg.data.val.pipeline)
val_dataset = build_dataset(cfg.data.val, dict(test_mode=True))
val_dataloader = build_dataloader(val_dataset, **val_dataloader_args)
eval_cfg = cfg.get('evaluation', {})
eval_cfg['by_epoch'] = cfg.runner['type'] != 'IterBasedRunner'
eval_hook = DistEvalHook if distributed else EvalHook
# In this PR (https://github.com/open-mmlab/mmcv/pull/1193), the
# priority of IterTimerHook has been modified from 'NORMAL' to 'LOW'.
runner.register_hook(eval_hook(val_dataloader, **eval_cfg),
priority='LOW')
resume_from = None
if cfg.resume_from is None and cfg.get('auto_resume'):
resume_from = find_latest_checkpoint(cfg.work_dir)
if resume_from is not None:
cfg.resume_from = resume_from
if cfg.resume_from:
runner.resume(cfg.resume_from)
elif cfg.load_from:
runner.load_checkpoint(cfg.load_from)
runner.run(data_loaders, cfg.workflow)
def train_detector(model,
dataset,
cfg,
distributed=False,
validate=False,
timestamp=None,
meta=None):
logger = get_root_logger(log_level=cfg.log_level)
# prepare data loaders
dataset = dataset if isinstance(dataset, (list, tuple)) else [dataset]
if 'imgs_per_gpu' in cfg.data:
logger.warning('"imgs_per_gpu" is deprecated in MMDet V2.0. '
'Please use "samples_per_gpu" instead')
if 'samples_per_gpu' in cfg.data:
logger.warning(
f'Got "imgs_per_gpu"={cfg.data.imgs_per_gpu} and '
f'"samples_per_gpu"={cfg.data.samples_per_gpu}, "imgs_per_gpu"'
f'={cfg.data.imgs_per_gpu} is used in this experiments')
else:
logger.warning(
'Automatically set "samples_per_gpu"="imgs_per_gpu"='
f'{cfg.data.imgs_per_gpu} in this experiments')
cfg.data.samples_per_gpu = cfg.data.imgs_per_gpu
runner_type = 'EpochBasedRunner' if 'runner' not in cfg else cfg.runner[
'type']
data_loaders = [
build_dataloader(
ds,
cfg.data.samples_per_gpu,
cfg.data.workers_per_gpu,
# `num_gpus` will be ignored if distributed
num_gpus=len(cfg.gpu_ids),
dist=distributed,
seed=cfg.seed,
runner_type=runner_type,
persistent_workers=cfg.data.get('persistent_workers', False))
for ds in dataset
]
# put model on gpus
if distributed:
find_unused_parameters = cfg.get('find_unused_parameters', False)
# Sets the `find_unused_parameters` parameter in
# torch.nn.parallel.DistributedDataParallel
model = MMDistributedDataParallel(
model.cuda(),
device_ids=[torch.cuda.current_device()],
broadcast_buffers=False,
find_unused_parameters=find_unused_parameters)
else:
model = MMDataParallel(model.cuda(cfg.gpu_ids[0]),
device_ids=cfg.gpu_ids)
# build runner
optimizer = build_optimizer(model, cfg.optimizer)
if 'runner' not in cfg:
cfg.runner = {
'type': 'EpochBasedRunner',
'max_epochs': cfg.total_epochs
}
warnings.warn(
'config is now expected to have a `runner` section, '
'please set `runner` in your config.', UserWarning)
else:
if 'total_epochs' in cfg:
assert cfg.total_epochs == cfg.runner.max_epochs
runner = build_runner(cfg.runner,
default_args=dict(model=model,
optimizer=optimizer,
work_dir=cfg.work_dir,
logger=logger,
meta=meta))
# an ugly workaround to make .log and .log.json filenames the same
runner.timestamp = timestamp
# fp16 setting
fp16_cfg = cfg.get('fp16', None)
if fp16_cfg is not None:
optimizer_config = Fp16OptimizerHook(**cfg.optimizer_config,
**fp16_cfg,
distributed=distributed)
elif distributed and 'type' not in cfg.optimizer_config:
optimizer_config = OptimizerHook(**cfg.optimizer_config)
else:
optimizer_config = cfg.optimizer_config
# register hooks
runner.register_training_hooks(cfg.lr_config,
optimizer_config,
cfg.checkpoint_config,
cfg.log_config,
cfg.get('momentum_config', None),
custom_hooks_config=cfg.get(
'custom_hooks', None))
if distributed:
if isinstance(runner, EpochBasedRunner):
runner.register_hook(DistSamplerSeedHook())
# register eval hooks
if validate:
# Support batch_size > 1 in validation
val_samples_per_gpu = cfg.data.val.pop('samples_per_gpu', 1)
if val_samples_per_gpu > 1:
# Replace 'ImageToTensor' to 'DefaultFormatBundle'
cfg.data.val.pipeline = replace_ImageToTensor(
cfg.data.val.pipeline)
val_dataset = build_dataset(cfg.data.val, dict(test_mode=True))
val_dataloader = build_dataloader(
val_dataset,
samples_per_gpu=val_samples_per_gpu,
workers_per_gpu=cfg.data.workers_per_gpu,
dist=distributed,
shuffle=False)
eval_cfg = cfg.get('evaluation', {})
eval_cfg['by_epoch'] = cfg.runner['type'] != 'IterBasedRunner'
eval_hook = DistEvalHook if distributed else EvalHook
# In this PR (https://github.com/open-mmlab/mmcv/pull/1193), the
# priority of IterTimerHook has been modified from 'NORMAL' to 'LOW'.
runner.register_hook(eval_hook(val_dataloader, **eval_cfg),
priority='LOW')
resume_from = None
if cfg.resume_from is None and cfg.get('auto_resume'):
resume_from = find_latest_checkpoint(cfg.work_dir)
if resume_from is not None:
cfg.resume_from = resume_from
if cfg.resume_from:
runner.resume(cfg.resume_from)
elif cfg.load_from:
runner.load_checkpoint(cfg.load_from)
runner.run(data_loaders, cfg.workflow)