def redesign_model(org_model,
model_config,
model_label,
model_type='original'):
logger.info('[{} model]'.format(model_label))
frozen_module_path_set = set(model_config.get('frozen_modules', list()))
module_paths = model_config.get('sequential', list())
if not isinstance(module_paths, list) or len(module_paths) == 0:
logger.info('Using the {} {} model'.format(model_type, model_label))
if len(frozen_module_path_set) > 0:
logger.info('Frozen module(s): {}'.format(frozen_module_path_set))
isinstance_str = 'instance('
for frozen_module_path in frozen_module_path_set:
if frozen_module_path.startswith(
isinstance_str) and frozen_module_path.endswith(')'):
target_cls = nn.__dict__[
frozen_module_path[len(isinstance_str):-1]]
for m in org_model.modules():
if isinstance(m, target_cls):
freeze_module_params(m)
else:
module = get_module(org_model, frozen_module_path)
freeze_module_params(module)
return org_model
logger.info('Redesigning the {} model with {}'.format(
model_label, module_paths))
if len(frozen_module_path_set) > 0:
logger.info('Frozen module(s): {}'.format(frozen_module_path_set))
module_dict = OrderedDict()
adaptation_dict = model_config.get('adaptations', dict())
for frozen_module_path in frozen_module_path_set:
module = get_module(org_model, frozen_module_path)
freeze_module_params(module)
for module_path in module_paths:
if module_path.startswith('+'):
module_path = module_path[1:]
adaptation_config = adaptation_dict[module_path]
module = get_adaptation_module(adaptation_config['type'],
**adaptation_config['params'])
else:
module = get_module(org_model, module_path)
if module_path in frozen_module_path_set:
freeze_module_params(module)
add_submodule(module, module_path, module_dict)
return build_sequential_container(module_dict)
def setup(self, train_config):
# Set up train and val data loaders
self.setup_data_loaders(train_config)
# Define model used in this stage
model_config = train_config.get('model', dict())
self.setup_model(model_config)
# Define loss function used in this stage
self.setup_loss(train_config)
# Wrap models if necessary
self.model =\
wrap_model(self.model, model_config, self.device, self.device_ids, self.distributed,
self.model_any_frozen)
if not model_config.get('requires_grad', True):
logger.info('Freezing the whole model')
freeze_module_params(self.model)
# Set up optimizer and scheduler
optim_config = train_config.get('optimizer', dict())
optimizer_reset = False
if len(optim_config) > 0:
optim_params_config = optim_config['params']
optim_params_config['lr'] *= self.lr_factor
module_wise_params_configs = optim_config.get('module_wise_params', list())
if len(module_wise_params_configs) > 0:
trainable_module_list = list()
for module_wise_params_config in module_wise_params_configs:
module_wise_params_dict = dict()
module_wise_params_dict.update(module_wise_params_config['params'])
if 'lr' in module_wise_params_dict:
module_wise_params_dict['lr'] *= self.lr_factor
module = get_module(self, module_wise_params_config['module'])
module_wise_params_dict['params'] = module.parameters()
trainable_module_list.append(module_wise_params_dict)
else:
trainable_module_list = nn.ModuleList([self.model])
self.optimizer = get_optimizer(trainable_module_list, optim_config['type'], optim_params_config)
optimizer_reset = True
scheduler_config = train_config.get('scheduler', None)
if scheduler_config is not None and len(scheduler_config) > 0:
self.lr_scheduler = get_scheduler(self.optimizer, scheduler_config['type'], scheduler_config['params'])
elif optimizer_reset:
self.lr_scheduler = None
# Set up apex if you require mixed-precision training
self.apex = False
apex_config = train_config.get('apex', None)
if apex_config is not None and apex_config.get('requires', False):
if sys.version_info < (3, 0):
raise RuntimeError('Apex currently only supports Python 3. Aborting.')
if amp is None:
raise RuntimeError('Failed to import apex. Please install apex from https://www.github.com/nvidia/apex '
'to enable mixed-precision training.')
self.model, self.optimizer =\
amp.initialize(self.model, self.optimizer, opt_level=apex_config['opt_level'])
self.apex = True
def setup(self, train_config):
# Set up train and val data loaders
self.setup_data_loaders(train_config)
# Define teacher and student models used in this stage
teacher_config = train_config.get('teacher', dict())
student_config = train_config.get('student', dict())
self.setup_teacher_student_models(teacher_config, student_config)
# Define loss function used in this stage
self.setup_loss(train_config)
# Freeze parameters if specified
self.teacher_updatable = True
if not teacher_config.get('requires_grad', True):
logger.info('Freezing the whole teacher model')
freeze_module_params(self.teacher_model)
self.teacher_updatable = False
if not student_config.get('requires_grad', True):
logger.info('Freezing the whole student model')
freeze_module_params(self.student_model)
# Wrap models if necessary
teacher_unused_parameters = teacher_config.get(
'find_unused_parameters', self.teacher_any_frozen)
teacher_any_updatable = len(
get_updatable_param_names(self.teacher_model)) > 0
self.teacher_model =\
wrap_model(self.teacher_model, teacher_config, self.device, self.device_ids, self.distributed,
teacher_unused_parameters, teacher_any_updatable)
student_unused_parameters = student_config.get(
'find_unused_parameters', self.student_any_frozen)
student_any_updatable = len(
get_updatable_param_names(self.student_model)) > 0
self.student_model =\
wrap_model(self.student_model, student_config, self.device, self.device_ids, self.distributed,
student_unused_parameters, student_any_updatable)
# Set up optimizer and scheduler
optim_config = train_config.get('optimizer', dict())
optimizer_reset = False
if len(optim_config) > 0:
optim_params_config = optim_config['params']
if 'lr' in optim_params_config:
optim_params_config['lr'] *= self.lr_factor
module_wise_params_configs = optim_config.get(
'module_wise_params', list())
if len(module_wise_params_configs) > 0:
trainable_module_list = list()
for module_wise_params_config in module_wise_params_configs:
module_wise_params_dict = dict()
if isinstance(
module_wise_params_config.get('params', None),
dict):
module_wise_params_dict.update(
module_wise_params_config['params'])
if 'lr' in module_wise_params_dict:
module_wise_params_dict['lr'] *= self.lr_factor
target_model = \
self.teacher_model if module_wise_params_config.get('is_teacher', False) else self.student_model
module = get_module(target_model,
module_wise_params_config['module'])
module_wise_params_dict['params'] = module.parameters()
trainable_module_list.append(module_wise_params_dict)
else:
trainable_module_list = nn.ModuleList([self.student_model])
if self.teacher_updatable:
logger.info(
'Note that you are training some/all of the modules in the teacher model'
)
trainable_module_list.append(self.teacher_model)
filters_params = optim_config.get('filters_params', True)
self.optimizer = \
get_optimizer(trainable_module_list, optim_config['type'], optim_params_config, filters_params)
self.optimizer.zero_grad()
self.max_grad_norm = optim_config.get('max_grad_norm', None)
self.grad_accum_step = optim_config.get('grad_accum_step', 1)
optimizer_reset = True
scheduler_config = train_config.get('scheduler', None)
if scheduler_config is not None and len(scheduler_config) > 0:
self.lr_scheduler = get_scheduler(self.optimizer,
scheduler_config['type'],
scheduler_config['params'])
self.scheduling_step = scheduler_config.get('scheduling_step', 0)
elif optimizer_reset:
self.lr_scheduler = None
self.scheduling_step = None
# Set up accelerator/apex if necessary
self.apex = False
apex_config = train_config.get('apex', None)
if self.accelerator is not None:
if self.teacher_updatable:
self.teacher_model, self.student_model, self.optimizer, self.train_data_loader, self.val_data_loader = \
self.accelerator.prepare(self.teacher_model, self.student_model, self.optimizer,
self.train_data_loader, self.val_data_loader)
else:
self.teacher_model = self.teacher_model.to(
self.accelerator.device)
if self.accelerator.state.use_fp16:
self.teacher_model = self.teacher_model.half()
self.student_model, self.optimizer, self.train_data_loader, self.val_data_loader = \
self.accelerator.prepare(self.student_model, self.optimizer,
self.train_data_loader, self.val_data_loader)
elif apex_config is not None and apex_config.get('requires', False):
if sys.version_info < (3, 0):
raise RuntimeError(
'Apex currently only supports Python 3. Aborting.')
if amp is None:
raise RuntimeError(
'Failed to import apex. Please install apex from https://www.github.com/nvidia/apex '
'to enable mixed-precision training.')
self.student_model, self.optimizer =\
amp.initialize(self.student_model, self.optimizer, opt_level=apex_config['opt_level'])
self.apex = True