def save_best_model(self, output_dir=None, filename_postfix=None):
assert self.best_model is not None, '[ERROR] The best model attribute is empty, you likely need to train the model first.'
# Ability to save to bespoke place or default to working directory.
if output_dir is None:
output_dir = self.config.DIRS.WORKING_DIR
# Add some extra text to the filename.
if filename_postfix is None:
filename_postfix = ''
full_path = os.path.join(
output_dir,
'caltech_birds_{}_full{}.pth'.format(self.config.MODEL.MODEL_NAME,
filename_postfix))
state_path = os.path.join(
output_dir,
'caltech_birds_{}_dict{}.pth'.format(self.config.MODEL.MODEL_NAME,
filename_postfix))
# Save out the best model and finish
save_model_full(model=self.best_model, PATH=full_path)
save_model_dict(model=self.best_model, PATH=state_path)
print(
'[INFO] Model has been successfully saved to the following directory: {}'
.format(output_dir))
print('[INFO] The full model filename is: caltech_birds_{}_full.pth'.
format(full_path))
print(
'[INFO] The state dictionary filename is: caltech_birds_{}_full.pth'
.format(state_path))
print('Device::', device)
# Setup the model and optimiser
model_ft = model_func(model_name, pretrained=True, num_classes=len(class_names))
#num_ftrs = model_ft.fc.in_features
# Here the size of each output sample is set to 2.
# Alternatively, it can be generalized to nn.Linear(num_ftrs, len(class_names)).
#model_ft.fc = nn.Linear(num_ftrs, len(class_names))
model_ft = model_ft.to(device)
criterion = nn.CrossEntropyLoss()
# Observe that all parameters are being optimized
optimizer_ft = optim.SGD(model_ft.parameters(), lr=0.001, momentum=0.9)
# Decay LR by a factor of 0.1 every 7 epochs
exp_lr_scheduler = lr_scheduler.StepLR(optimizer_ft, step_size=7, gamma=0.1)
# Train the model
model_ft, history = train_model(model=model_ft, criterion=criterion, optimizer=optimizer_ft, scheduler=exp_lr_scheduler,
device=device, dataloaders=dataloaders, dataset_sizes=dataset_sizes, num_epochs=num_epochs,
return_history=True, log_history=True, working_dir=working_dir
)
# Save out the best model and finish
save_model_full(model=model_ft, PATH=os.path.join(working_dir,'caltech_birds_{}_full.pth'.format(model_name)))
save_model_dict(model=model_ft, PATH=os.path.join(working_dir,'caltech_birds_{}_dict.pth'.format(model_name)))