def after_train_iter(self, runner):
if not self.every_n_iters(runner, self.interval):
return
model = runner.model.module if is_module_wrapper(
runner.model) else runner.model
# update momentum
_interp_cfg = deepcopy(self.interp_cfg)
if self.momentum_policy != 'fixed':
_updated_args = self.momentum_updater(runner, **self.momentum_cfg)
_interp_cfg.update(_updated_args)
for key in self.module_keys:
# get current ema states
ema_net = getattr(model, key)
states_ema = ema_net.state_dict(keep_vars=False)
# get currently original states
net = getattr(model, key[:-4])
states_orig = net.state_dict(keep_vars=True)
for k, v in states_orig.items():
if runner.iter < self.start_iter:
states_ema[k].data.copy_(v.data)
else:
states_ema[k] = self.interp_func(v,
states_ema[k],
trainable=v.requires_grad,
**_interp_cfg).detach()
ema_net.load_state_dict(states_ema, strict=True)
def multipath_batch_processor(model, data, train_mode, **kwargs):
""" train_iter """
if is_module_wrapper(model):
model_ = model.module
else:
model_ = model
model(**data, mode='target')
all_loss = 0
for idx, forward_singleop_online in enumerate(model_.forward_op_online):
loss = model(**data,
mode='train',
idx=idx,
forward_singleop_online=forward_singleop_online)
all_loss += loss
loss /= model_.update_interval
if model_.use_fp16:
with apex.amp.scale_loss(loss, model_.optimizer) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
losses = dict(loss=(all_loss / (len(model_.forward_op_online))))
loss, log_vars = parse_losses(losses)
outputs = dict(loss=loss,
log_vars=log_vars,
num_samples=len(data['img'].data))
return outputs
def before_train_epoch(self, runner):
"""Close mosaic and mixup augmentation and switches to use L1 loss."""
epoch = runner.epoch
train_loader = runner.data_loader
model = runner.model
if is_module_wrapper(model):
model = model.module
if (epoch + 1) == runner.max_epochs - self.num_last_epochs:
runner.logger.info('No mosaic and mixup aug now!')
# The dataset pipeline cannot be updated when persistent_workers
# is True, so we need to force the dataloader's multi-process
# restart. This is a very hacky approach.
train_loader.dataset.update_skip_type_keys(self.skip_type_keys)
if hasattr(train_loader, 'persistent_workers'
) and train_loader.persistent_workers is True:
train_loader._DataLoader__initialized = False
train_loader._iterator = None
self._restart_dataloader = True
runner.logger.info('Add additional L1 loss now!')
if hasattr(model, 'detector'):
model.detector.bbox_head.use_l1 = True
else:
model.bbox_head.use_l1 = True
else:
# Once the restart is complete, we need to restore
# the initialization flag.
if self._restart_dataloader:
train_loader._DataLoader__initialized = True
def __init__(self,
*args,
is_dynamic_ddp=False,
pass_training_status=False,
fp16_loss_scaler=None,
use_apex_amp=False,
**kwargs):
super().__init__(*args, **kwargs)
if is_module_wrapper(self.model):
_model = self.model.module
else:
_model = self.model
self.is_dynamic_ddp = is_dynamic_ddp
self.pass_training_status = pass_training_status
# add a flag for checking if `self.optimizer` comes from `_model`
self.optimizer_from_model = False
# add support for optimizer is None.
# sanity check for whether `_model` contains self-defined optimizer
if hasattr(_model, 'optimizer'):
assert self.optimizer is None, (
'Runner and model cannot contain optimizer at the same time.')
self.optimizer_from_model = True
self.optimizer = _model.optimizer
# add fp16 grad scaler, using pytorch official GradScaler
self.with_fp16_grad_scaler = False
if fp16_loss_scaler is not None:
self.loss_scaler = GradScaler(**fp16_loss_scaler)
self.with_fp16_grad_scaler = True
mmcv.print_log('Use FP16 grad scaler in Training', 'mmgen')
# flag to use amp in apex (NVIDIA)
self.use_apex_amp = use_apex_amp
def after_train_epoch(self, runner): # fast version of eval
if not self.every_n_epochs(runner, self.interval):
return
print('evaluation')
dataloader = build_dataloader(dataset=self.dataset,
workers_per_gpu=self.cfg.workers_per_gpu,
batch_size=1,
sampler=torch.utils.data.DistributedSampler(self.dataset),
dist=True)
if is_module_wrapper(runner.model.module):
model = runnner.model.module
else:
model = runner.model
model.eval()
results = []
rank = runner.rank
world_size = runner.world_size
if rank == 0:
prog_bar = mmcv.ProgressBar(len(self.dataset))
for i, data in enumerate(dataloader):
with torch.no_grad():
result = model.val_step(data, None)
results.append(result)
if rank == 0:
batch_size = 1 # something wrong here
for _ in range(batch_size * world_size):
prog_bar.update()
model.train()
# collect results from all ranks
results = collect_results(results, len(self.dataset),
os.path.join(runner.work_dir, 'temp/cycle_eval'))
if runner.rank == 0:
self.evaluate(runner, results)
def before_train_iter(self, runner):
if self.every_n_iters(runner, self.update_interval):
if is_module_wrapper(runner.model):
model_ = runner.model.module
else:
model_ = runner.model
model_.forward_op_online = model_.online_backbone.set_forward_cfg(method='fair')
model_.forward_op_target = model_.online_backbone.set_forward_cfg(method='fair')
def before_train_epoch(self, runner):
if is_module_wrapper(runner.model):
model = runner.model.module
else:
model = runner.model
model.set_epoch(runner.epoch)
m = model.base_momentum * runner.epoch / runner.max_epochs
model.momentum = m
def train(self, data_loader, **kwargs):
if is_module_wrapper(self.model):
_model = self.model.module
else:
_model = self.model
self.model.train()
self.mode = 'train'
# check if self.optimizer from model and track it
if self.optimizer_from_model:
self.optimizer = _model.optimizer
self.data_loader = data_loader
self._epoch = data_loader.epoch
self.call_hook('before_fetch_train_data')
data_batch = next(self.data_loader)
self.call_hook('before_train_iter')
# prepare input args for train_step
# running status
if self.pass_training_status:
running_status = dict(iteration=self.iter, epoch=self.epoch)
kwargs['running_status'] = running_status
# ddp reducer for tracking dynamic computational graph
if self.is_dynamic_ddp:
kwargs.update(dict(ddp_reducer=self.model.reducer))
if self.with_fp16_grad_scaler:
kwargs.update(dict(loss_scaler=self.loss_scaler))
if self.use_apex_amp:
kwargs.update(dict(use_apex_amp=True))
outputs = self.model.train_step(data_batch, self.optimizer, **kwargs)
# the loss scaler should be updated after ``train_step``
if self.with_fp16_grad_scaler:
self.loss_scaler.update()
# further check for the cases where the optimizer is built in
# `train_step`.
if self.optimizer is None:
if hasattr(_model, 'optimizer'):
self.optimizer_from_model = True
self.optimizer = _model.optimizer
# check if self.optimizer from model and track it
if self.optimizer_from_model:
self.optimizer = _model.optimizer
if not isinstance(outputs, dict):
raise TypeError('model.train_step() must return a dict')
if 'log_vars' in outputs:
self.log_buffer.update(outputs['log_vars'], outputs['num_samples'])
self.outputs = outputs
self.call_hook('after_train_iter')
self._inner_iter += 1
self._iter += 1
def _save_checkpoint(model,
filename,
optimizer_b=None,
optimizer_g=None,
optimizer_d=None,
meta=None):
"""Save checkpoint to file.
The checkpoint will have 3 fields: ``meta``, ``state_dict`` and
``optimizer``. By default ``meta`` will contain version and time info.
Args:
model (Module): Module whose params are to be saved.
filename (str): Checkpoint filename.
optimizer (:obj:`Optimizer`, optional): Optimizer to be saved.
meta (dict, optional): Metadata to be saved in checkpoint.
"""
if meta is None:
meta = {}
elif not isinstance(meta, dict):
raise TypeError(f'meta must be a dict or None, but got {type(meta)}')
meta.update(mmcv_version=mmcv.__version__, time=time.asctime())
mmcv.mkdir_or_exist(osp.dirname(filename))
if is_module_wrapper(model):
model = model.module
checkpoint = {
'meta': meta,
'state_dict': weights_to_cpu(model.state_dict())
}
# save optimizer state dict in the checkpoint
if isinstance(optimizer_b, Optimizer):
checkpoint['optimizer_b'] = optimizer_b.state_dict()
elif isinstance(optimizer_b, dict):
checkpoint['optimizer_b'] = {}
for name, optim in optimizer_b.items():
checkpoint['optimizer_b'][name] = optim.state_dict()
if isinstance(optimizer_g, Optimizer):
checkpoint['optimizer_g'] = optimizer_g.state_dict()
elif isinstance(optimizer_g, dict):
checkpoint['optimizer_g'] = {}
for name, optim in optimizer_g.items():
checkpoint['optimizer_g'][name] = optim.state_dict()
if isinstance(optimizer_d, Optimizer):
checkpoint['optimizer_d'] = optimizer_d.state_dict()
elif isinstance(optimizer_d, dict):
checkpoint['optimizer_d'] = {}
for name, optim in optimizer_d.items():
checkpoint['optimizer_d'][name] = optim.state_dict()
# immediately flush buffer
with open(filename, 'wb') as f:
torch.save(checkpoint, f)
f.flush()
def extract_inception_features(dataloader,
inception,
num_samples,
inception_style='pytorch'):
"""Extract inception features for FID metric.
Args:
dataloader (:obj:`DataLoader`): Dataloader for images.
inception (nn.Module): Inception network.
num_samples (int): The number of samples to be extracted.
inception_style (str): The style of Inception network, "pytorch" or
"stylegan". Defaults to "pytorch".
Returns:
torch.Tensor: Inception features.
"""
batch_size = dataloader.batch_size
num_iters = num_samples // batch_size
if num_iters * batch_size < num_samples:
num_iters += 1
# define mmcv progress bar
pbar = mmcv.ProgressBar(num_iters)
feature_list = []
curr_iter = 1
for data in dataloader:
img = data['real_img']
pbar.update()
# the inception network is not wrapped with module wrapper.
if not is_module_wrapper(inception):
# put the img to the module device
img = img.to(get_module_device(inception))
if inception_style == 'stylegan':
img = (img * 127.5 + 128).clamp(0, 255).to(torch.uint8)
feature = inception(img, return_features=True)
else:
feature = inception(img)[0].view(img.shape[0], -1)
feature_list.append(feature.to('cpu'))
if curr_iter >= num_iters:
break
curr_iter += 1
# Attention: the number of features may be different as you want.
features = torch.cat(feature_list, 0)
assert features.shape[0] >= num_samples
features = features[:num_samples]
# to change the line after pbar
sys.stdout.write('\n')
return features
def before_train_epoch(self, runner):
"""Close mosaic and mixup augmentation and switches to use L1 loss."""
epoch = runner.epoch
train_loader = runner.data_loader
model = runner.model
if is_module_wrapper(model):
model = model.module
if (epoch + 1) == runner.max_epochs - self.num_last_epochs:
runner.logger.info('No mosaic and mixup aug now!')
train_loader.dataset.update_skip_type_keys(self.skip_type_keys)
runner.logger.info('Add additional L1 loss now!')
model.bbox_head.use_l1 = True
def before_run(self, runner):
model = runner.model.module if is_module_wrapper(
runner.model) else runner.model
# sanity check for ema model
for k in self.module_keys:
if not hasattr(model, k) and not hasattr(model, k[:-4]):
raise RuntimeError(
f'Cannot find both {k[:-4]} and {k} network for EMA hook.')
if not hasattr(model, k) and hasattr(model, k[:-4]):
setattr(model, k, deepcopy(getattr(model, k[:-4])))
warnings.warn(
f'We do not suggest construct and initialize EMA model {k}'
' in hook. You may explicitly define it by yourself.')
def load(module, prefix=''):
# recursively check parallel module in case that the model has a
# complicated structure, e.g., nn.Module(nn.Module(DDP))
if is_module_wrapper(module):
module = module.module
local_metadata = {} if metadata is None else metadata.get(
prefix[:-1], {})
module._load_from_state_dict(state_dict, prefix, local_metadata, True,
all_missing_keys, unexpected_keys,
err_msg)
for name, child in module._modules.items():
if child is not None:
load(child, prefix + name + '.')
def before_fetch_train_data(self, runner):
"""The behavior before fetch train data.
Args:
runner (object): The runner.
"""
if not self.every_n_iters(runner, self.interval):
return
_module = runner.model.module if is_module_wrapper(
runner.model) else runner.model
_next_scale_int = _module._next_scale_int
if isinstance(_next_scale_int, torch.Tensor):
_next_scale_int = _next_scale_int.item()
runner.data_loader.update_dataloader(_next_scale_int)
def test_is_module_wrapper():
class Model(nn.Module):
def __init__(self):
super().__init__()
self.conv = nn.Conv2d(2, 2, 1)
def forward(self, x):
return self.conv(x)
# _verify_model_across_ranks is added in torch1.9.0,
# _verify_params_across_processes is added in torch1.11.0,
# so we should check whether _verify_model_across_ranks
# and _verify_params_across_processes are the member of
# torch.distributed before mocking
if hasattr(torch.distributed, '_verify_model_across_ranks'):
torch.distributed._verify_model_across_ranks = mock
if hasattr(torch.distributed, '_verify_params_across_processes'):
torch.distributed._verify_params_across_processes = mock
model = Model()
assert not is_module_wrapper(model)
dp = DataParallel(model)
assert is_module_wrapper(dp)
mmdp = MMDataParallel(model)
assert is_module_wrapper(mmdp)
ddp = DistributedDataParallel(model, process_group=MagicMock())
assert is_module_wrapper(ddp)
mmddp = MMDistributedDataParallel(model, process_group=MagicMock())
assert is_module_wrapper(mmddp)
deprecated_mmddp = DeprecatedMMDDP(model)
assert is_module_wrapper(deprecated_mmddp)
# test module wrapper registry
@MODULE_WRAPPERS.register_module()
class ModuleWrapper(object):
def __init__(self, module):
self.module = module
def forward(self, *args, **kwargs):
return self.module(*args, **kwargs)
module_wraper = ModuleWrapper(model)
assert is_module_wrapper(module_wraper)
def before_run(self, runner):
"""To resume model with it's ema parameters more friendly.
Register ema parameter as ``named_buffer`` to model
"""
model = runner.model
if is_module_wrapper(model):
model = model.module
self.param_ema_buffer = {}
self.model_parameters = dict(model.named_parameters(recurse=True))
for name, value in self.model_parameters.items():
# "." is not allowed in module's buffer name
buffer_name = f"ema_{name.replace('.', '_')}"
self.param_ema_buffer[name] = buffer_name
model.register_buffer(buffer_name, value.data.clone())
self.model_buffers = dict(model.named_buffers(recurse=True))
if self.checkpoint is not None:
runner.resume(self.checkpoint)
def get_state_dict(module, destination=None, prefix='', keep_vars=False):
"""Returns a dictionary containing a whole state of the module.
Both parameters and persistent buffers (e.g. running averages) are
included. Keys are corresponding parameter and buffer names.
This method is modified from :meth:`torch.nn.Module.state_dict` to
recursively check parallel module in case that the model has a complicated
structure, e.g., nn.Module(nn.Module(DDP)).
Args:
module (nn.Module): The module to generate state_dict.
destination (OrderedDict): Returned dict for the state of the
module.
prefix (str): Prefix of the key.
keep_vars (bool): Whether to keep the variable property of the
parameters. Default: False.
Returns:
dict: A dictionary containing a whole state of the module.
"""
# recursively check parallel module in case that the model has a
# complicated structure, e.g., nn.Module(nn.Module(DDP))
if is_module_wrapper(module):
module = module.module
# below is the same as torch.nn.Module.state_dict()
if destination is None:
destination = OrderedDict()
destination._metadata = OrderedDict()
destination._metadata[prefix[:-1]] = local_metadata = dict(
version=module._version)
_save_to_state_dict(module, destination, prefix, keep_vars)
for name, child in module._modules.items():
if child is not None:
get_state_dict(child,
destination,
prefix + name + '.',
keep_vars=keep_vars)
for hook in module._state_dict_hooks.values():
hook_result = hook(module, destination, prefix, local_metadata)
if hook_result is not None:
destination = hook_result
return destination
def after_train_iter(self, runner):
if not self.every_n_iters(runner, self.interval):
return
model = runner.model.module if is_module_wrapper(
runner.model) else runner.model
for key in self.module_keys:
# get current ema states
ema_net = getattr(model, key)
states_ema = ema_net.state_dict(keep_vars=False)
# get currently original states
net = getattr(model, key[:-4])
states_orig = net.state_dict(keep_vars=True)
for k, v in states_orig.items():
states_ema[k] = self.interp_func(
v, states_ema[k], trainable=v.requires_grad).detach()
ema_net.load_state_dict(states_ema, strict=True)
def test_is_module_wrapper():
class Model(nn.Module):
def __init__(self):
super().__init__()
self.conv = nn.Conv2d(2, 2, 1)
def forward(self, x):
return self.conv(x)
model = Model()
assert not is_module_wrapper(model)
dp = DataParallel(model)
assert is_module_wrapper(dp)
mmdp = MMDataParallel(model)
assert is_module_wrapper(mmdp)
ddp = DistributedDataParallel(model, process_group=MagicMock())
assert is_module_wrapper(ddp)
mmddp = MMDistributedDataParallel(model, process_group=MagicMock())
assert is_module_wrapper(mmddp)
deprecated_mmddp = DeprecatedMMDDP(model)
assert is_module_wrapper(deprecated_mmddp)
# test module wrapper registry
@MODULE_WRAPPERS.register_module()
class ModuleWrapper(object):
def __init__(self, module):
self.module = module
def forward(self, *args, **kwargs):
return self.module(*args, **kwargs)
module_wraper = ModuleWrapper(model)
assert is_module_wrapper(module_wraper)
def __init__(self,
*args,
is_dynamic_ddp=False,
pass_training_status=False,
**kwargs):
super().__init__(*args, **kwargs)
if is_module_wrapper(self.model):
_model = self.model.module
else:
_model = self.model
self.is_dynamic_ddp = is_dynamic_ddp
self.pass_training_status = pass_training_status
# add a flag for checking if `self.optimizer` comes from `_model`
self.optimizer_from_model = False
# add support for optimizer is None.
# sanity check for whether `_model` contains self-defined optimizer
if hasattr(_model, 'optimizer'):
assert self.optimizer is None, (
'Runner and model cannot contain optimizer at the same time.')
self.optimizer_from_model = True
self.optimizer = _model.optimizer
def _get_model(self, runner):
if is_module_wrapper(runner.model):
return runner.model.module
else:
return runner.model
def save_checkpoint(model, filename, optimizer=None, meta=None):
"""Save checkpoint to file.
The checkpoint will have 3 fields: ``meta``, ``state_dict`` and
``optimizer``. By default ``meta`` will contain version and time info.
Args:
model (Module): Module whose params are to be saved.
filename (str): Checkpoint filename.
optimizer (:obj:`Optimizer`, optional): Optimizer to be saved.
meta (dict, optional): Metadata to be saved in checkpoint.
"""
if meta is None:
meta = {}
elif not isinstance(meta, dict):
raise TypeError(f'meta must be a dict or None, but got {type(meta)}')
meta.update(mmcv_version=mmcv.__version__, time=time.asctime())
if is_module_wrapper(model):
model = model.module
if hasattr(model, 'CLASSES') and model.CLASSES is not None:
# save class name to the meta
meta.update(CLASSES=model.CLASSES)
checkpoint = {
'meta': meta,
'state_dict': weights_to_cpu(get_state_dict(model))
}
# save optimizer state dict in the checkpoint
if isinstance(optimizer, Optimizer):
checkpoint['optimizer'] = optimizer.state_dict()
elif isinstance(optimizer, dict):
checkpoint['optimizer'] = {}
for name, optim in optimizer.items():
checkpoint['optimizer'][name] = optim.state_dict()
if filename.startswith('pavi://'):
try:
from pavi import modelcloud
from pavi.exception import NodeNotFoundError
except ImportError:
raise ImportError(
'Please install pavi to load checkpoint from modelcloud.')
model_path = filename[7:]
root = modelcloud.Folder()
model_dir, model_name = osp.split(model_path)
try:
model = modelcloud.get(model_dir)
except NodeNotFoundError:
model = root.create_training_model(model_dir)
with TemporaryDirectory() as tmp_dir:
checkpoint_file = osp.join(tmp_dir, model_name)
with open(checkpoint_file, 'wb') as f:
torch.save(checkpoint, f)
f.flush()
model.create_file(checkpoint_file, name=model_name)
else:
mmcv.mkdir_or_exist(osp.dirname(filename))
# immediately flush buffer
with open(filename, 'wb') as f:
torch.save(checkpoint, f)
f.flush()
def after_train_iter(self, runner):
if self.every_n_iters(runner, self.update_interval):
if is_module_wrapper(runner.model):
runner.model.module.momentum_update()
else:
runner.model.momentum_update()
def train_step(self, data_batch, optimizer):
"""Train step.
Args:
data_batch (dict): A batch of data.
optimizer (obj): Optimizer.
Returns:
dict: Returned output.
"""
# during initialization, load weights from the ema model
if (self.step_counter == self.start_iter
and self.generator_ema is not None):
if is_module_wrapper(self.generator):
self.generator.module.load_state_dict(
self.generator_ema.module.state_dict())
else:
self.generator.load_state_dict(self.generator_ema.state_dict())
# data
lq = data_batch['lq']
gt = data_batch['gt']
gt_pixel, gt_percep, gt_gan = gt.clone(), gt.clone(), gt.clone()
if self.is_use_sharpened_gt_in_pixel:
gt_pixel = data_batch['gt_unsharp']
if self.is_use_sharpened_gt_in_percep:
gt_percep = data_batch['gt_unsharp']
if self.is_use_sharpened_gt_in_gan:
gt_gan = data_batch['gt_unsharp']
# generator
fake_g_output = self.generator(lq)
losses = dict()
log_vars = dict()
# no updates to discriminator parameters.
if self.gan_loss:
set_requires_grad(self.discriminator, False)
if (self.step_counter % self.disc_steps == 0
and self.step_counter >= self.disc_init_steps):
if self.pixel_loss:
losses['loss_pix'] = self.pixel_loss(fake_g_output, gt_pixel)
if self.perceptual_loss:
loss_percep, loss_style = self.perceptual_loss(
fake_g_output, gt_percep)
if loss_percep is not None:
losses['loss_perceptual'] = loss_percep
if loss_style is not None:
losses['loss_style'] = loss_style
# gan loss for generator
if self.gan_loss:
fake_g_pred = self.discriminator(fake_g_output)
losses['loss_gan'] = self.gan_loss(fake_g_pred,
target_is_real=True,
is_disc=False)
# parse loss
loss_g, log_vars_g = self.parse_losses(losses)
log_vars.update(log_vars_g)
# optimize
optimizer['generator'].zero_grad()
loss_g.backward()
optimizer['generator'].step()
# discriminator
if self.gan_loss:
set_requires_grad(self.discriminator, True)
# real
real_d_pred = self.discriminator(gt_gan)
loss_d_real = self.gan_loss(real_d_pred,
target_is_real=True,
is_disc=True)
loss_d, log_vars_d = self.parse_losses(
dict(loss_d_real=loss_d_real))
optimizer['discriminator'].zero_grad()
loss_d.backward()
log_vars.update(log_vars_d)
# fake
fake_d_pred = self.discriminator(fake_g_output.detach())
loss_d_fake = self.gan_loss(fake_d_pred,
target_is_real=False,
is_disc=True)
loss_d, log_vars_d = self.parse_losses(
dict(loss_d_fake=loss_d_fake))
loss_d.backward()
log_vars.update(log_vars_d)
optimizer['discriminator'].step()
self.step_counter += 1
log_vars.pop('loss') # remove the unnecessary 'loss'
outputs = dict(log_vars=log_vars,
num_samples=len(gt.data),
results=dict(lq=lq.cpu(),
gt=gt.cpu(),
output=fake_g_output.cpu()))
return outputs
def _dist_train(model, dataset, cfg, logger=None, timestamp=None, meta=None):
# prepare data loaders
dataset = dataset if isinstance(dataset, (list, tuple)) else [dataset]
data_loaders = [
build_dataloader(ds,
cfg.data.imgs_per_gpu,
cfg.data.workers_per_gpu,
dist=True,
shuffle=True,
replace=getattr(cfg.data, 'sampling_replace', False),
seed=cfg.seed,
drop_last=getattr(cfg.data, 'drop_last', False),
prefetch=cfg.prefetch,
img_norm_cfg=cfg.img_norm_cfg) for ds in dataset
]
optimizer = build_optimizer(model, cfg.optimizer)
if 'use_fp16' in cfg and cfg.use_fp16:
model, optimizer = apex.amp.initialize(model.cuda(),
optimizer,
opt_level="O1")
model.use_fp16 = True
print_log('**** Initializing mixed precision done. ****')
# put model on gpus
model = MMDistributedDataParallel(
model if next(model.parameters()).is_cuda else model.cuda(),
device_ids=[torch.cuda.current_device()],
broadcast_buffers=False,
find_unused_parameters=True)
# build runner
runner = MultiStageRunner(model=model,
batch_processor=multipath_batch_processor,
optimizer=optimizer,
work_dir=cfg.work_dir,
logger=logger,
meta=meta,
num_stages=model.module.num_block,
max_epochs=cfg.total_epochs)
# an ugly walkaround to make the .log and .log.json filenames the same
runner.timestamp = timestamp
optimizer_config = DistOptimizerHook(**cfg.optimizer_config)
# register hooks
runner.register_training_hooks(cfg.lr_config, optimizer_config,
cfg.checkpoint_config, cfg.log_config)
runner.register_hook(DistSamplerSeedHook())
# register custom hooks
for hook in cfg.get('custom_hooks', ()):
if hook.type == 'DeepClusterHook':
common_params = dict(dist_mode=True, data_loaders=data_loaders)
else:
common_params = dict(dist_mode=True)
runner.register_hook(build_hook(hook, common_params))
if cfg.resume_from:
runner.resume(cfg.resume_from,
resume_optimizer='resume_optimizer' in cfg
and cfg.resume_optimizer)
elif cfg.load_from:
runner.load_checkpoint(cfg.load_from)
if is_module_wrapper(model):
model.module.optimizer = optimizer
else:
model.optimizer = optimizer
runner.run(data_loaders, cfg.workflow, cfg.total_epochs)
def __init__(self,
model,
batch_processor=None,
optimizer=None,
work_dir=None,
logger=None,
meta=None,
max_iters=None,
max_epochs=None):
if batch_processor is not None:
if not callable(batch_processor):
raise TypeError('batch_processor must be callable, '
f'but got {type(batch_processor)}')
warnings.warn('batch_processor is deprecated, please implement '
'train_step() and val_step() in the model instead.')
# raise an error is `batch_processor` is not None and
# `model.train_step()` exists.
if is_module_wrapper(model):
_model = model.module
else:
_model = model
if hasattr(_model, 'train_step') or hasattr(_model, 'val_step'):
raise RuntimeError(
'batch_processor and model.train_step()/model.val_step() '
'cannot be both available.')
else:
assert hasattr(model, 'train_step')
# check the type of `optimizer`
if isinstance(optimizer, dict):
for name, optim in optimizer.items():
if not isinstance(optim, Optimizer):
raise TypeError(
f'optimizer must be a dict of torch.optim.Optimizers, '
f'but optimizer["{name}"] is a {type(optim)}')
elif not isinstance(optimizer, Optimizer) and optimizer is not None:
raise TypeError(
f'optimizer must be a torch.optim.Optimizer object '
f'or dict or None, but got {type(optimizer)}')
# check the type of `logger`
if not isinstance(logger, logging.Logger):
raise TypeError(f'logger must be a logging.Logger object, '
f'but got {type(logger)}')
# check the type of `meta`
if meta is not None and not isinstance(meta, dict):
raise TypeError(
f'meta must be a dict or None, but got {type(meta)}')
self.model = model
self.batch_processor = batch_processor
self.optimizer = optimizer
self.logger = logger
self.meta = meta
# create work_dir
if mmcv.is_str(work_dir):
self.work_dir = osp.abspath(work_dir)
mmcv.mkdir_or_exist(self.work_dir)
elif work_dir is None:
self.work_dir = None
else:
raise TypeError('"work_dir" must be a str or None')
# get model name from the model class
if hasattr(self.model, 'module'):
self._model_name = self.model.module.__class__.__name__
else:
self._model_name = self.model.__class__.__name__
self._rank, self._world_size = get_dist_info()
self.timestamp = get_time_str()
self.mode = None
self._hooks = []
self._epoch = 0
self._iter = 0
self._inner_iter = 0
if max_epochs is not None and max_iters is not None:
raise ValueError(
'Only one of `max_epochs` or `max_iters` can be set.')
self._max_epochs = max_epochs
self._max_iters = max_iters
# TODO: Redesign LogBuffer, it is not flexible and elegant enough
self.log_buffer = LogBuffer()
def before_train_epoch(self, runner):
epoch = runner.epoch
model = runner.model
if is_module_wrapper(model):
model = model.module
model.set_epoch(epoch)
def extract_inception_features(dataloader,
inception,
num_samples,
inception_style='pytorch'):
"""Extract inception features for FID metric.
Args:
dataloader (:obj:`DataLoader`): Dataloader for images.
inception (nn.Module): Inception network.
num_samples (int): The number of samples to be extracted.
inception_style (str): The style of Inception network, "pytorch" or
"stylegan". Defaults to "pytorch".
Returns:
torch.Tensor: Inception features.
"""
batch_size = dataloader.batch_size
num_iters = num_samples // batch_size
if num_iters * batch_size < num_samples:
num_iters += 1
# define mmcv progress bar
pbar = mmcv.ProgressBar(num_iters)
feature_list = []
curr_iter = 1
for data in dataloader:
# a dirty walkround to support multiple datasets (mainly for the
# unconditional dataset and conditional dataset). In our
# implementation, unconditioanl dataset will return real images with
# the key "real_img". However, the conditional dataset contains a key
# "img" denoting the real images.
if 'real_img' in data:
# Mainly for the unconditional dataset in our MMGeneration
img = data['real_img']
else:
# Mainly for conditional dataset in MMClassification
img = data['img']
pbar.update()
# the inception network is not wrapped with module wrapper.
if not is_module_wrapper(inception):
# put the img to the module device
img = img.to(get_module_device(inception))
if inception_style == 'stylegan':
img = (img * 127.5 + 128).clamp(0, 255).to(torch.uint8)
feature = inception(img, return_features=True)
else:
feature = inception(img)[0].view(img.shape[0], -1)
feature_list.append(feature.to('cpu'))
if curr_iter >= num_iters:
break
curr_iter += 1
# Attention: the number of features may be different as you want.
features = torch.cat(feature_list, 0)
assert features.shape[0] >= num_samples
features = features[:num_samples]
# to change the line after pbar
sys.stdout.write('\n')
return features