class SimpleModel(CustomModule, EmbeddingGenerator):
ae_day: Autoencoder
ae_night: Autoencoder
def __init__(self):
encoder_upper, decoder_lower = UpperEncoder(), LowerDecoder()
self.ae_day = Autoencoder(LowerEncoder(), encoder_upper, decoder_lower,
UpperDecoder())
self.ae_night = Autoencoder(LowerEncoder(), encoder_upper,
decoder_lower, UpperDecoder())
self.loss_fn = nn.L1Loss()
self.optimizer_day = None
self.optimizer_night = None
self.scheduler_day = None
self.scheduler_night = None
def __call__(self, input):
raise NotImplementedError
def init_optimizers(self):
"""
Is called right before training and after model has been moved to GPU.
Supposed to initialize optimizers and schedulers.
"""
self.optimizer_day = Adam(self.ae_day.parameters(), lr=1e-4)
self.optimizer_night = Adam(self.ae_night.parameters(), lr=1e-4)
self.scheduler_day = ReduceLROnPlateau(self.optimizer_day,
patience=15,
verbose=True)
self.scheduler_night = ReduceLROnPlateau(self.optimizer_night,
patience=15,
verbose=True)
def train_epoch(self, train_loader, epoch, use_cuda, log_path, **kwargs):
loss_day_sum, loss_night_sum = 0, 0
for day_img, night_img in train_loader:
if use_cuda:
day_img, night_img = day_img.cuda(), night_img.cuda()
# zero day gradients
self.optimizer_day.zero_grad()
# train day autoencoder
out_day = self.ae_day(day_img)
loss_day = self.loss_fn(out_day, day_img)
# optimize
loss_day.backward()
self.optimizer_day.step()
# zero night gradients
self.optimizer_night.zero_grad()
# train night autoencoder
out_night = self.ae_night(night_img)
loss_night = self.loss_fn(out_night, night_img)
# optimize
loss_night.backward()
self.optimizer_night.step()
loss_day_sum += loss_day
loss_night_sum += loss_night
loss_day_mean = loss_day_sum / len(train_loader)
loss_night_mean = loss_night_sum / len(train_loader)
self.scheduler_day.step(loss_day_mean, epoch)
self.scheduler_night.step(loss_night_mean, epoch)
# log losses
log_str = f'[Epoch {epoch}] Train day loss: {loss_day_mean} Train night loss: {loss_night_mean}'
print(log_str)
with open(os.path.join(log_path, 'log.txt'), 'a+') as f:
f.write(log_str + '\n')
def validate(self, val_loader, epoch, use_cuda, log_path, **kwargs):
loss_day_sum, loss_night_sum = 0, 0
day_img, night_img, out_day, out_night = (None, ) * 4
with torch.no_grad():
for day_img, night_img in val_loader:
if use_cuda:
day_img, night_img = day_img.cuda(), night_img.cuda()
out_day = self.ae_day(day_img)
loss_day = self.loss_fn(out_day, day_img)
out_night = self.ae_night(night_img)
loss_night = self.loss_fn(out_night, night_img)
loss_day_sum += loss_day
loss_night_sum += loss_night
loss_day_mean = loss_day_sum / len(val_loader)
loss_night_mean = loss_night_sum / len(val_loader)
# domain translation
day_to_night = self.ae_night.decode(
self.ae_day.encode(day_img[0].unsqueeze(0)))
night_to_day = self.ae_day.decode(
self.ae_night.encode(night_img[0].unsqueeze(0)))
# log losses
log_str = f'[Epoch {epoch}] Val day loss: {loss_day_mean} Val night loss: {loss_night_mean}'
print(log_str)
with open(os.path.join(log_path, 'log.txt'), 'a+') as f:
f.write(log_str + '\n')
# save sample images
samples = {
'day_img': day_img[0],
'night_img': night_img[0],
'out_day': out_day[0],
'out_night': out_night[0],
'day_to_night': day_to_night[0],
'night_to_day': night_to_day[0]
}
for name, img in samples.items():
ToPILImage()(img.cpu()).save(
os.path.join(log_path, f'{epoch}_{name}.jpeg'), 'JPEG')
def register_hooks(self, layers):
"""
This function is not supposed to be called from outside the class.
"""
handles = []
embedding_dict = {}
def get_hook(name, embedding_dict):
def hook(model, input, output):
embedding_dict[name] = output.detach()
return hook
for layer in layers:
hook = get_hook(layer, embedding_dict)
handles.append(
getattr(self.ae_day.encoder_upper,
layer).register_forward_hook(hook))
return handles, embedding_dict
def deregister_hooks(self, handles):
"""
This function is not supposed to be called from outside the class.
"""
for handle in handles:
handle.remove()
def get_day_embeddings(self, img, layers):
"""
Returns deep embeddings for the passed layers inside the upper encoder.
"""
handles, embedding_dict = self.register_hooks(layers)
# forward pass
self.ae_day.encode(img)
self.deregister_hooks(handles)
return embedding_dict
def get_night_embeddings(self, img, layers):
"""
Returns deep embeddings for the passed layers inside the upper encoder.
"""
handles, embedding_dict = self.register_hooks(layers)
# forward pass
self.ae_night.encode(img)
self.deregister_hooks(handles)
return embedding_dict
def train(self):
self.ae_day.train()
self.ae_night.train()
def eval(self):
self.ae_day.eval()
self.ae_night.eval()
def cuda(self):
self.ae_day.cuda()
self.ae_night.cuda()
def state_dict(self):
return {
'encoder_lower_day': self.ae_day.encoder_lower.state_dict(),
'encoder_lower_night': self.ae_night.encoder_lower.state_dict(),
'encoder_upper': self.ae_day.encoder_upper.state_dict(),
'decoder_day': self.ae_day.decoder.state_dict(),
'decoder_night': self.ae_night.decoder.state_dict()
}
def optim_state_dict(self):
return {
'optimizer_day': self.optimizer_day.state_dict(),
'optimizer_night': self.optimizer_night.state_dict()
}
def load_state_dict(self, state):
self.ae_day.encoder_lower.load_state_dict(state['encoder_lower_day'])
self.ae_night.encoder_lower.load_state_dict(
state['encoder_lower_night'])
self.ae_day.encoder_upper.load_state_dict(state['encoder_upper'])
self.ae_day.decoder.load_state_dict(state['decoder_day'])
self.ae_night.decoder.load_state_dict(state['decoder_night'])
def load_optim_state_dict(self, state):
self.optimizer_day.load_state_dict(state['optimizer_day'])
self.optimizer_night.load_state_dict(state['optimizer_night'])
class CycleModel(CustomModule):
ae_day: Autoencoder
ae_night: Autoencoder
reconstruction_loss_factor: float
cycle_loss_factor: float
def __init__(self, reconstruction_loss_factor: float, cycle_loss_factor: float):
# share weights of the upper encoder & lower decoder
encoder_upper, decoder_lower = UpperEncoder(), LowerDecoder()
self.ae_day = Autoencoder(LowerEncoder(), encoder_upper, decoder_lower, UpperDecoder())
self.ae_night = Autoencoder(LowerEncoder(), encoder_upper, decoder_lower, UpperDecoder())
self.loss_fn = nn.L1Loss()
self.reconstruction_loss_factor = reconstruction_loss_factor
self.cycle_loss_factor = cycle_loss_factor
self.optimizer = None
self.scheduler = None
def __call__(self, input):
raise NotImplementedError
def init_optimizers(self):
"""
Is called right before training and after model has been moved to GPU.
Supposed to initialize optimizers and schedulers.
"""
parameters = set()
parameters |= set(self.ae_day.parameters())
parameters |= set(self.ae_night.parameters())
self.optimizer = Adam(parameters)
# initialize scheduler
self.scheduler = ReduceLROnPlateau(self.optimizer, patience=15, verbose=True)
def train_epoch(self, train_loader, epoch, use_cuda, log_path, **kwargs):
loss_day2night2day_sum, loss_night2day2night_sum, loss_day2day_sum, loss_night2night_sum = 0, 0, 0, 0
for day_img, night_img in train_loader:
if use_cuda:
day_img, night_img = day_img.cuda(), night_img.cuda()
# Day -> Night -> Day
self.optimizer.zero_grad()
loss_day2night2day, loss_day2day = self.cycle_plus_reconstruction_loss(day_img, self.ae_day, self.ae_night)
loss = loss_day2night2day * self.cycle_loss_factor + loss_day2day * self.reconstruction_loss_factor
loss.backward()
self.optimizer.step()
# Night -> Day -> Night
self.optimizer.zero_grad()
loss_night2day2night, loss_night2night \
= self.cycle_plus_reconstruction_loss(night_img, self.ae_night, self.ae_day)
loss = loss_night2day2night * self.cycle_loss_factor + loss_night2night * self.reconstruction_loss_factor
loss.backward()
self.optimizer.step()
loss_day2night2day_sum += loss_day2night2day
loss_day2day_sum += loss_day2day
loss_night2day2night_sum += loss_night2day2night
loss_night2night_sum += loss_night2night
loss_day2night2day_mean = loss_day2night2day_sum / len(train_loader)
loss_day2day_mean = loss_day2day_sum / len(train_loader)
loss_night2day2night_mean = loss_night2day2night_sum / len(train_loader)
loss_night2night_mean = loss_night2night_sum / len(train_loader)
loss_mean = (loss_day2night2day_mean + loss_day2day_mean + loss_night2day2night_mean + loss_night2night_mean)/4
self.scheduler.step(loss_mean, epoch)
# log losses
log_str = f'[Epoch {epoch}] ' \
f'Train loss day -> night -> day: {loss_day2night2day_mean} ' \
f'Train loss night -> day -> night: {loss_night2day2night_mean} ' \
f'Train loss day -> day: {loss_day2day_mean} ' \
f'Train loss night -> night: {loss_night2night_mean}'
print(log_str)
with open(os.path.join(log_path, 'log.txt'), 'a+') as f:
f.write(log_str + '\n')
def validate(self, val_loader, epoch, use_cuda, log_path, **kwargs):
loss_day2night2day_sum, loss_night2day2night_sum, loss_day2day_sum, loss_night2night_sum = 0, 0, 0, 0
day_img, night_img = None, None
with torch.no_grad():
for day_img, night_img in val_loader:
if use_cuda:
day_img, night_img = day_img.cuda(), night_img.cuda()
# Day -> Night -> Day and Day -> Day
loss_day2night2day, loss_day2day = \
self.cycle_plus_reconstruction_loss(day_img, self.ae_day, self.ae_night)
# Night -> Day -> Night and Night -> Night
loss_night2day2night, loss_night2night = \
self.cycle_plus_reconstruction_loss(night_img, self.ae_night, self.ae_day)
loss_day2night2day_sum += loss_day2night2day
loss_day2day_sum += loss_day2day
loss_night2day2night_sum += loss_night2day2night
loss_night2night_sum += loss_night2night
loss_day2night2day_mean = loss_day2night2day_sum / len(val_loader)
loss_night2day2night_mean = loss_night2day2night_sum / len(val_loader)
loss_day2day_mean = loss_day2day_sum / len(val_loader)
loss_night2night_mean = loss_night2night_sum / len(val_loader)
# log losses
log_str = f'[Epoch {epoch}] ' \
f'Val loss day -> night -> day: {loss_day2night2day_mean} ' \
f'Val loss night -> day -> night: {loss_night2day2night_mean} ' \
f'Val loss day -> day: {loss_day2day_mean} ' \
f'Val loss night -> night: {loss_night2night_mean}'
print(log_str)
with open(os.path.join(log_path, 'log.txt'), 'a+') as f:
f.write(log_str + '\n')
# create sample images
latent_day = self.ae_day.encode(day_img[0].unsqueeze(0))
latent_night = self.ae_night.encode(night_img[0].unsqueeze(0))
# reconstruction
day2day = self.ae_day.decode(latent_day)
night2night = self.ae_night.decode(latent_night)
# domain translation
day2night = self.ae_night.decode(latent_day)
night2day = self.ae_day.decode(latent_night)
# cycle
day2night2day = self.ae_day.decode(self.ae_night.encode(day2night))
night2day2night = self.ae_night.decode(self.ae_day.encode(night2day))
# save sample images
samples = {
'day_img': day_img[0],
'night_img': night_img[0],
'day2day': day2day[0],
'night2night': night2night[0],
'day2night': day2night[0],
'night2day': night2day[0],
'day2night2day': day2night2day[0],
'night2day2night': night2day2night[0],
}
for name, img in samples.items():
ToPILImage()(img.cpu()).save(os.path.join(log_path, f'{epoch}_{name}.jpeg'), 'JPEG')
def cycle_plus_reconstruction_loss(self, image, autoencoder1, autoencoder2):
# send the image through the cycle
intermediate_latent_1 = autoencoder1.encode(image)
intermediate_opposite = autoencoder2.decode(intermediate_latent_1)
intermediate_latent_2 = autoencoder2.encode(intermediate_opposite)
cycle_img = autoencoder1.decode(intermediate_latent_2)
# do simple reconstruction
reconstructed_img = autoencoder1.decode(intermediate_latent_1)
cycle_loss = self.loss_fn(cycle_img, image)
reconstruction_loss = self.loss_fn(reconstructed_img, image)
return cycle_loss, reconstruction_loss
def train(self):
self.ae_day.train()
self.ae_night.train()
def eval(self):
self.ae_day.eval()
self.ae_night.eval()
def cuda(self):
self.ae_day.cuda()
self.ae_night.cuda()
def state_dict(self):
return {
'encoder_lower_day': self.ae_day.encoder_lower.state_dict(),
'encoder_lower_night': self.ae_night.encoder_lower.state_dict(),
'encoder_upper': self.ae_day.encoder_upper.state_dict(),
'decoder_day': self.ae_day.decoder.state_dict(),
'decoder_night': self.ae_night.decoder.state_dict()
}
def optim_state_dict(self):
return {
'optimizer': self.optimizer.state_dict(),
}
def load_state_dict(self, state):
self.ae_day.encoder_lower.load_state_dict(state['encoder_lower_day'])
self.ae_night.encoder_lower.load_state_dict(state['encoder_lower_night'])
self.ae_day.encoder_upper.load_state_dict(state['encoder_upper'])
self.ae_day.decoder.load_state_dict(state['decoder_day'])
self.ae_night.decoder.load_state_dict(state['decoder_night'])
class CycleVAE(CustomModule, EmbeddingGenerator):
"""
CycleVAE model. This is the model which was used for evaluation.
"""
def get_day_embeddings(self, img, layers):
"""
Returns deep embeddings for the passed layers inside the upper encoder.
"""
# forward pass
latent = self.ae_day.encode(img)[0]
return {'latent': latent}
def get_night_embeddings(self, img, layers):
"""
Returns deep embeddings for the passed layers inside the upper encoder.
"""
# forward pass
latent = self.ae_night.encode(img)[0]
return {'latent': latent}
def __init__(self, params: dict):
self.params = params
# share weights of the upper encoder & lower decoder
encoder_upper, decoder_lower = UpperEncoder(), LowerDecoder()
self.ae_day = Autoencoder(LowerEncoder(), encoder_upper, decoder_lower,
UpperDecoder())
self.ae_night = Autoencoder(LowerEncoder(), encoder_upper,
decoder_lower, UpperDecoder())
self.reconst_loss = nn.L1Loss()
self.optimizer = None
self.scheduler = None
def __call__(self, input):
raise NotImplementedError
def init_optimizers(self):
"""
Is called right before training and after model has been moved to GPU.
Supposed to initialize optimizers and schedulers.
"""
params = list(self.ae_day.parameters()) + list(
self.ae_night.parameters())
self.optimizer = Adam([p for p in params if p.requires_grad],
lr=self.params['lr'])
self.scheduler = ReduceLROnPlateau(self.optimizer,
patience=self.params['patience'],
verbose=True)
def train_epoch(self, train_loader, epoch, use_cuda, log_path, **kwargs):
loss_sum = 0
for img_day, img_night in train_loader:
if use_cuda:
img_day, img_night = img_day.cuda(), img_night.cuda()
self.optimizer.zero_grad()
latent_day, noise_day = self.ae_day.encode(img_day)
latent_night, noise_night = self.ae_night.encode(img_night)
# same domain reconstruction
reconst_day = self.ae_day.decode(latent_day + noise_day)
reconst_night = self.ae_night.decode(latent_night + noise_night)
# cross domain
night_to_day = self.ae_day.decode(latent_night + noise_night)
day_to_night = self.ae_night.decode(latent_day + noise_day)
# encode again for cycle loss
latent_night_to_day, noise_night_to_day = self.ae_day.encode(
night_to_day)
latent_day_to_night, noise_day_to_night = self.ae_night.encode(
day_to_night)
# aaaand decode again
reconst_cycle_day = self.ae_day.decode(latent_day_to_night +
noise_day_to_night)
reconst_cycle_night = self.ae_night.decode(latent_night_to_day +
noise_night_to_day)
# loss formulations
loss_reconst_day = self.reconst_loss(reconst_day, img_day)
loss_reconst_night = self.reconst_loss(reconst_night, img_night)
loss_kl_reconst_day = kl_loss(latent_day)
loss_kl_reconst_night = kl_loss(latent_night)
loss_cycle_day = self.reconst_loss(reconst_cycle_day, img_day)
loss_cycle_night = self.reconst_loss(reconst_cycle_night,
img_night)
loss_kl_cycle_day = kl_loss(latent_night_to_day)
loss_kl_cycle_night = kl_loss(latent_day_to_night)
loss = \
self.params['loss_reconst'] * (loss_reconst_day + loss_reconst_night) + \
self.params['loss_kl_reconst'] * (loss_kl_reconst_day + loss_kl_reconst_night) + \
self.params['loss_cycle'] * (loss_cycle_day + loss_cycle_night) + \
self.params['loss_kl_cycle'] * (loss_kl_cycle_day + loss_kl_cycle_night)
loss.backward()
self.optimizer.step()
loss_sum += loss.detach().item()
loss_mean = loss_sum / len(train_loader)
self.scheduler.step(loss_mean, epoch)
# log loss
log_str = f'[Epoch {epoch}] Train loss: {loss_mean}'
print(log_str)
with open(os.path.join(log_path, 'log.txt'), 'a+') as f:
f.write(log_str + '\n')
def validate(self, val_loader, epoch, use_cuda, log_path, **kwargs):
loss_sum = 0
img_day, img_night, reconst_day, reconst_night, reconst_cycle_day, reconst_cycle_night = (
None, ) * 6
with torch.no_grad():
for img_day, img_night in val_loader:
if use_cuda:
img_day, img_night = img_day.cuda(), img_night.cuda()
latent_day, noise_day = self.ae_day.encode(img_day)
latent_night, noise_night = self.ae_night.encode(img_night)
# same domain reconstruction
reconst_day = self.ae_day.decode(latent_day + noise_day)
reconst_night = self.ae_night.decode(latent_night +
noise_night)
# cross domain
night_to_day = self.ae_day.decode(latent_night + noise_night)
day_to_night = self.ae_night.decode(latent_day + noise_day)
# encode again for cycle loss
latent_night_to_day, noise_night_to_day = self.ae_day.encode(
night_to_day)
latent_day_to_night, noise_day_to_night = self.ae_night.encode(
day_to_night)
# aaaand decode again
reconst_cycle_day = self.ae_day.decode(latent_day_to_night +
noise_day_to_night)
reconst_cycle_night = self.ae_night.decode(
latent_night_to_day + noise_night_to_day)
# loss formulations
loss_reconst_day = self.reconst_loss(reconst_day, img_day)
loss_reconst_night = self.reconst_loss(reconst_night,
img_night)
loss_kl_reconst_day = kl_loss(latent_day)
loss_kl_reconst_night = kl_loss(latent_night)
loss_cycle_day = self.reconst_loss(reconst_cycle_day, img_day)
loss_cycle_night = self.reconst_loss(reconst_cycle_night,
img_night)
loss_kl_cycle_day = kl_loss(latent_night_to_day)
loss_kl_cycle_night = kl_loss(latent_day_to_night)
loss = \
self.params['loss_reconst'] * (loss_reconst_day + loss_reconst_night) + \
self.params['loss_kl_reconst'] * (loss_kl_reconst_day + loss_kl_reconst_night) + \
self.params['loss_cycle'] * (loss_cycle_day + loss_cycle_night) + \
self.params['loss_kl_cycle'] * (loss_kl_cycle_day + loss_kl_cycle_night)
loss_sum += loss.detach().item()
loss_mean = loss_sum / len(val_loader)
# domain translation
day_to_night = self.ae_night.decode(
self.ae_day.encode(img_day[0].unsqueeze(0))[0])
night_to_day = self.ae_day.decode(
self.ae_night.encode(img_night[0].unsqueeze(0))[0])
# log loss
log_str = f'[Epoch {epoch}] Val loss: {loss_mean}'
print(log_str)
with open(os.path.join(log_path, 'log.txt'), 'a+') as f:
f.write(log_str + '\n')
# save sample images
samples = {
'day_img': img_day[0],
'night_img': img_night[0],
'reconst_day': reconst_day[0],
'reconst_night': reconst_night[0],
'reconst_cycle_day': reconst_cycle_day[0],
'reconst_cycle_night': reconst_cycle_night[0],
'day_to_night': day_to_night[0],
'night_to_day': night_to_day[0]
}
for name, img in samples.items():
ToPILImage()(img.cpu()).save(
os.path.join(log_path, f'{epoch}_{name}.jpeg'), 'JPEG')
def train(self):
self.ae_day.train()
self.ae_night.train()
def eval(self):
self.ae_day.eval()
self.ae_night.eval()
def cuda(self):
self.ae_day.cuda()
self.ae_night.cuda()
def state_dict(self):
return {
'encoder_lower_day': self.ae_day.encoder_lower.state_dict(),
'encoder_lower_night': self.ae_night.encoder_lower.state_dict(),
'encoder_upper': self.ae_day.encoder_upper.state_dict(),
'decoder_lower': self.ae_day.decoder_lower.state_dict(),
'decoder_upper_day': self.ae_day.decoder_upper.state_dict(),
'decoder_upper_night': self.ae_night.decoder_upper.state_dict()
}
def optim_state_dict(self):
return self.optimizer.state_dict()
def load_state_dict(self, state):
self.ae_day.encoder_lower.load_state_dict(state['encoder_lower_day'])
self.ae_night.encoder_lower.load_state_dict(
state['encoder_lower_night'])
self.ae_day.encoder_upper.load_state_dict(state['encoder_upper'])
self.ae_day.decoder_lower.load_state_dict(state['decoder_lower'])
self.ae_day.decoder_upper.load_state_dict(state['decoder_upper_day'])
self.ae_night.decoder_upper.load_state_dict(
state['decoder_upper_night'])
def load_optim_state_dict(self, state_dict):
self.optimizer.load_state_dict(state_dict)