def get_loss():
if args.loss == LossType.L1:
return nn.L1Loss()
if args.loss == LossType.SmoothL1:
return nn.SmoothL1Loss(beta=0.01)
if args.loss == LossType.L2:
return nn.MSELoss()
if args.loss == LossType.SSIM:
return PIQLoss(piq.SSIMLoss())
if args.loss == LossType.VIF:
return PIQLoss(piq.VIFLoss())
if args.loss == LossType.LPIPS:
return PIQLoss(piq.LPIPS())
if args.loss == LossType.DISTS:
return PIQLoss(piq.DISTS())
raise ValueError("Unknown loss")
def main():
# Read RGB image and it's noisy version
x = torch.tensor(imread('tests/assets/i01_01_5.bmp')).permute(2, 0,
1) / 255.
y = torch.tensor(imread('tests/assets/I01.BMP')).permute(2, 0, 1) / 255.
if torch.cuda.is_available():
# Move to GPU to make computaions faster
x = x.cuda()
y = y.cuda()
# To compute BRISQUE score as a measure, use lower case function from the library
brisque_index: torch.Tensor = piq.brisque(x,
data_range=1.,
reduction='none')
# In order to use BRISQUE as a loss function, use corresponding PyTorch module.
# Note: the back propagation is not available using torch==1.5.0.
# Update the environment with latest torch and torchvision.
brisque_loss: torch.Tensor = piq.BRISQUELoss(data_range=1.,
reduction='none')(x)
print(
f"BRISQUE index: {brisque_index.item():0.4f}, loss: {brisque_loss.item():0.4f}"
)
# To compute Content score as a loss function, use corresponding PyTorch module
# By default VGG16 model is used, but any feature extractor model is supported.
# Don't forget to adjust layers names accordingly. Features from different layers can be weighted differently.
# Use weights parameter. See other options in class docstring.
content_loss = piq.ContentLoss(feature_extractor="vgg16",
layers=("relu3_3", ),
reduction='none')(x, y)
print(f"ContentLoss: {content_loss.item():0.4f}")
# To compute DISTS as a loss function, use corresponding PyTorch module
# By default input images are normalized with ImageNet statistics before forwarding through VGG16 model.
# If there is no need to normalize the data, use mean=[0.0, 0.0, 0.0] and std=[1.0, 1.0, 1.0].
dists_loss = piq.DISTS(reduction='none')(x, y)
print(f"DISTS: {dists_loss.item():0.4f}")
# To compute FSIM as a measure, use lower case function from the library
fsim_index: torch.Tensor = piq.fsim(x, y, data_range=1., reduction='none')
# In order to use FSIM as a loss function, use corresponding PyTorch module
fsim_loss = piq.FSIMLoss(data_range=1., reduction='none')(x, y)
print(
f"FSIM index: {fsim_index.item():0.4f}, loss: {fsim_loss.item():0.4f}")
# To compute GMSD as a measure, use lower case function from the library
# This is port of MATLAB version from the authors of original paper.
# In any case it should me minimized. Usually values of GMSD lie in [0, 0.35] interval.
gmsd_index: torch.Tensor = piq.gmsd(x, y, data_range=1., reduction='none')
# In order to use GMSD as a loss function, use corresponding PyTorch module:
gmsd_loss: torch.Tensor = piq.GMSDLoss(data_range=1., reduction='none')(x,
y)
print(
f"GMSD index: {gmsd_index.item():0.4f}, loss: {gmsd_loss.item():0.4f}")
# To compute HaarPSI as a measure, use lower case function from the library
# This is port of MATLAB version from the authors of original paper.
haarpsi_index: torch.Tensor = piq.haarpsi(x,
y,
data_range=1.,
reduction='none')
# In order to use HaarPSI as a loss function, use corresponding PyTorch module
haarpsi_loss: torch.Tensor = piq.HaarPSILoss(data_range=1.,
reduction='none')(x, y)
print(
f"HaarPSI index: {haarpsi_index.item():0.4f}, loss: {haarpsi_loss.item():0.4f}"
)
# To compute LPIPS as a loss function, use corresponding PyTorch module
lpips_loss: torch.Tensor = piq.LPIPS(reduction='none')(x, y)
print(f"LPIPS: {lpips_loss.item():0.4f}")
# To compute MDSI as a measure, use lower case function from the library
mdsi_index: torch.Tensor = piq.mdsi(x, y, data_range=1., reduction='none')
# In order to use MDSI as a loss function, use corresponding PyTorch module
mdsi_loss: torch.Tensor = piq.MDSILoss(data_range=1., reduction='none')(x,
y)
print(
f"MDSI index: {mdsi_index.item():0.4f}, loss: {mdsi_loss.item():0.4f}")
# To compute MS-SSIM index as a measure, use lower case function from the library:
ms_ssim_index: torch.Tensor = piq.multi_scale_ssim(x, y, data_range=1.)
# In order to use MS-SSIM as a loss function, use corresponding PyTorch module:
ms_ssim_loss = piq.MultiScaleSSIMLoss(data_range=1., reduction='none')(x,
y)
print(
f"MS-SSIM index: {ms_ssim_index.item():0.4f}, loss: {ms_ssim_loss.item():0.4f}"
)
# To compute Multi-Scale GMSD as a measure, use lower case function from the library
# It can be used both as a measure and as a loss function. In any case it should me minimized.
# By defualt scale weights are initialized with values from the paper.
# You can change them by passing a list of 4 variables to scale_weights argument during initialization
# Note that input tensors should contain images with height and width equal 2 ** number_of_scales + 1 at least.
ms_gmsd_index: torch.Tensor = piq.multi_scale_gmsd(x,
y,
data_range=1.,
chromatic=True,
reduction='none')
# In order to use Multi-Scale GMSD as a loss function, use corresponding PyTorch module
ms_gmsd_loss: torch.Tensor = piq.MultiScaleGMSDLoss(chromatic=True,
data_range=1.,
reduction='none')(x, y)
print(
f"MS-GMSDc index: {ms_gmsd_index.item():0.4f}, loss: {ms_gmsd_loss.item():0.4f}"
)
# To compute PSNR as a measure, use lower case function from the library.
psnr_index = piq.psnr(x, y, data_range=1., reduction='none')
print(f"PSNR index: {psnr_index.item():0.4f}")
# To compute PieAPP as a loss function, use corresponding PyTorch module:
pieapp_loss: torch.Tensor = piq.PieAPP(reduction='none', stride=32)(x, y)
print(f"PieAPP loss: {pieapp_loss.item():0.4f}")
# To compute SSIM index as a measure, use lower case function from the library:
ssim_index = piq.ssim(x, y, data_range=1.)
# In order to use SSIM as a loss function, use corresponding PyTorch module:
ssim_loss: torch.Tensor = piq.SSIMLoss(data_range=1.)(x, y)
print(
f"SSIM index: {ssim_index.item():0.4f}, loss: {ssim_loss.item():0.4f}")
# To compute Style score as a loss function, use corresponding PyTorch module:
# By default VGG16 model is used, but any feature extractor model is supported.
# Don't forget to adjust layers names accordingly. Features from different layers can be weighted differently.
# Use weights parameter. See other options in class docstring.
style_loss = piq.StyleLoss(feature_extractor="vgg16",
layers=("relu3_3", ))(x, y)
print(f"Style: {style_loss.item():0.4f}")
# To compute TV as a measure, use lower case function from the library:
tv_index: torch.Tensor = piq.total_variation(x)
# In order to use TV as a loss function, use corresponding PyTorch module:
tv_loss: torch.Tensor = piq.TVLoss(reduction='none')(x)
print(f"TV index: {tv_index.item():0.4f}, loss: {tv_loss.item():0.4f}")
# To compute VIF as a measure, use lower case function from the library:
vif_index: torch.Tensor = piq.vif_p(x, y, data_range=1.)
# In order to use VIF as a loss function, use corresponding PyTorch class:
vif_loss: torch.Tensor = piq.VIFLoss(sigma_n_sq=2.0, data_range=1.)(x, y)
print(f"VIFp index: {vif_index.item():0.4f}, loss: {vif_loss.item():0.4f}")
# To compute VSI score as a measure, use lower case function from the library:
vsi_index: torch.Tensor = piq.vsi(x, y, data_range=1.)
# In order to use VSI as a loss function, use corresponding PyTorch module:
vsi_loss: torch.Tensor = piq.VSILoss(data_range=1.)(x, y)
print(f"VSI index: {vsi_index.item():0.4f}, loss: {vsi_loss.item():0.4f}")