def __init__(self,
height=64,
width=64,
with_r=False,
with_boundary=False):
super(AddCoordsTh, self).__init__()
self.with_r = with_r
self.with_boundary = with_boundary
device = torch.device(
'cuda' if torch.cuda.is_available() else 'cpu')
with torch.no_grad():
x_coords = torch.arange(height).unsqueeze(1).expand(
height, width).float()
y_coords = torch.arange(width).unsqueeze(0).expand(
height, width).float()
x_coords = (x_coords / (height - 1)) * 2 - 1
y_coords = (y_coords / (width - 1)) * 2 - 1
coords = torch.stack([x_coords, y_coords],
dim=0) # (2, height, width)
if self.with_r:
rr = torch.sqrt(
torch.pow(x_coords, 2) +
torch.pow(y_coords, 2)) # (height, width)
rr = (rr / torch.max(rr)).unsqueeze(0)
coords = torch.cat([coords, rr], dim=0)
self.coords = coords.unsqueeze(0).to(
device) # (1, 2 or 3, height, width)
self.x_coords = x_coords.to(device)
self.y_coords = y_coords.to(device)
def finetune(self, z, y):
h = self.shared(z)
out = []
for layer in self.unshared:
out += [layer(h)]
out = porch.stack(out, dim=1) # (batch, num_domains, style_dim)
s = porch.take(
out, list(zip(range(y.size(0)),
y.numpy().astype(int).tolist())))
return s, h, out
def forward(self, x, y):
h = self.shared(x)
h = porch.varbase_to_tensor(h)
h = h.view(h.size(0), -1)
out = []
for layer in self.unshared:
out += [layer(h)]
out = porch.stack(out, dim=1) # (batch, num_domains, style_dim)
s = porch.take(
out, list(zip(range(y.shape[0]),
y.numpy().astype(int).tolist())))
return s
def calculate_lpips_given_images(group_of_images):
# group_of_images = [porch.randn(N, C, H, W) for _ in range(10)]
device = porch.device('cuda' if porch.cuda.is_available() else 'cpu')
lpips = LPIPS(pretrained_weights_fn="./metrics/LPIPS_pretrained.pdparams")
lpips.eval()
lpips_values = []
num_rand_outputs = len(group_of_images)
# calculate the average of pairwise distances among all random outputs
for i in range(num_rand_outputs - 1):
for j in range(i + 1, num_rand_outputs):
lpips_values.append(lpips(group_of_images[i], group_of_images[j]))
lpips_value = porch.mean(porch.stack(lpips_values, dim=0))
return lpips_value.numpy()
def shift(x, N):
"""Shift N pixels up or down."""
up = N >= 0
N = abs(N)
_, _, H, W = x.shape
if N == 0:
return x
if up:
head = torch.arange(H - N) + N
tail = torch.arange(N)
else:
head = torch.arange(N) + (H - N)
tail = torch.arange(H - N)
# permutation indices
perm = torch.cat([head, tail])
out = torch.stack([x[:, :, int(a)] for a in perm.numpy()], dim=2)
return out
def calculate_metrics(nets, args, step, mode):
print('Calculating evaluation metrics...')
assert mode in ['latent', 'reference']
device = porch.device('cuda' if porch.cuda.is_available() else 'cpu')
for name in nets:
nets[name].eval()
domains = os.listdir(args.val_img_dir)
domains.sort()
num_domains = len(domains)
print('Number of domains: %d' % num_domains)
enable_lpips = True # save time to check FID result
if enable_lpips:
lpips_dict = OrderedDict()
for trg_idx, trg_domain in enumerate(domains):
src_domains = [x for x in domains if x != trg_domain]
if mode == 'reference':
path_ref = os.path.join(args.val_img_dir, trg_domain)
loader_ref = get_eval_loader(root=path_ref,
img_size=args.img_size,
batch_size=args.val_batch_size,
imagenet_normalize=False,
drop_last=True)
for src_idx, src_domain in enumerate(src_domains):
path_src = os.path.join(args.val_img_dir, src_domain)
loader_src = get_eval_loader(root=path_src,
img_size=args.img_size,
batch_size=args.val_batch_size,
imagenet_normalize=False)
task = '%s2%s' % (src_domain, trg_domain)
path_fake = os.path.join(args.eval_dir, task)
shutil.rmtree(path_fake, ignore_errors=True)
os.makedirs(path_fake)
lpips_values = []
print('Generating images and calculating LPIPS for %s...' %
task)
for i, x_src in enumerate(
tqdm(loader_src, total=len(loader_src))):
x_src = porch.stack(
x_src, dim=0) #porch.varbase_to_tensor(x_src[0])
N = x_src.size(0)
y_trg = porch.tensor([trg_idx] * N)
masks = nets.fan.get_heatmap(
x_src) if args.w_hpf > 0 else None
# generate 10 outputs from the same input
group_of_images = []
for j in range(args.num_outs_per_domain):
if mode == 'latent':
z_trg = porch.randn(N, args.latent_dim)
s_trg = nets.mapping_network(z_trg, y_trg)
else:
try:
x_ref = next(iter_ref)
except:
iter_ref = iter(loader_ref)
x_ref = next(iter_ref)
x_ref = porch.stack(x_ref, dim=0)
if x_ref.size(0) > N:
x_ref = x_ref[:N]
s_trg = nets.style_encoder(x_ref, y_trg)
x_fake = nets.generator(x_src, s_trg, masks=masks)
group_of_images.append(x_fake)
# save generated images to calculate FID later
for k in range(N):
filename = os.path.join(
path_fake, '%.4i_%.2i.png' %
(i * args.val_batch_size + (k + 1), j + 1))
utils.save_image(x_fake[k],
ncol=1,
filename=filename)
lpips_value = calculate_lpips_given_images(group_of_images)
lpips_values.append(lpips_value)
# calculate LPIPS for each task (e.g. cat2dog, dog2cat)
lpips_mean = np.array(lpips_values).mean().astype(float)
lpips_dict['LPIPS_%s/%s' % (mode, task)] = lpips_mean
# delete dataloaders
del loader_src
if mode == 'reference':
del loader_ref
del iter_ref
# calculate the average LPIPS for all tasks
lpips_mean = 0
for _, value in lpips_dict.items():
lpips_mean += value / len(lpips_dict)
lpips_dict['LPIPS_%s/mean' % mode] = lpips_mean
# report LPIPS values
filename = os.path.join(args.eval_dir,
'LPIPS_%.5i_%s.json' % (step, mode))
utils.save_json(lpips_dict, filename)
# calculate and report fid values
return calculate_fid_for_all_tasks(args, domains, step=step, mode=mode)
for name in nets:
nets[name].train()
def make_grid(tensor,
nrow=8,
padding=2,
normalize=False,
range=None,
scale_each=False,
pad_value=0):
"""Make a grid of images.
Args:
tensor (Tensor or list): 4D mini-batch Tensor of shape (B x C x H x W)
or a list of images all of the same size.
nrow (int, optional): Number of images displayed in each row of the grid.
The final grid size is ``(B / nrow, nrow)``. Default: ``8``.
padding (int, optional): amount of padding. Default: ``2``.
normalize (bool, optional): If True, shift the image to the range (0, 1),
by the min and max values specified by :attr:`range`. Default: ``False``.
range (tuple, optional): tuple (min, max) where min and max are numbers,
then these numbers are used to normalize the image. By default, min and max
are computed from the tensor.
scale_each (bool, optional): If ``True``, scale each image in the batch of
images separately rather than the (min, max) over all images. Default: ``False``.
pad_value (float, optional): Value for the padded pixels. Default: ``0``.
Example:
See this notebook `here <https://gist.github.com/anonymous/bf16430f7750c023141c562f3e9f2a91>`_
"""
tensor = torch.Tensor(tensor)
if not (torch.is_tensor(tensor) or
(isinstance(tensor, list)
and all(torch.is_tensor(t) for t in tensor))):
raise TypeError('tensor or list of tensors expected, got {}'.format(
type(tensor)))
# if list of tensors, convert to a 4D mini-batch Tensor
if isinstance(tensor, list):
tensor = torch.stack(tensor, dim=0)
if tensor.dim() == 2: # single image H x W
tensor = tensor.unsqueeze(0)
if tensor.dim() == 3: # single image
if tensor.size(0) == 1: # if single-channel, convert to 3-channel
tensor = torch.cat((tensor, tensor, tensor), 0)
tensor = tensor.unsqueeze(0)
if tensor.dim() == 4 and tensor.size(1) == 1: # single-channel images
tensor = torch.cat((tensor, tensor, tensor), 1)
if normalize is True:
tensor = tensor.clone() # avoid modifying tensor in-place
if range is not None:
assert isinstance(range, tuple), \
"range has to be a tuple (min, max) if specified. min and max are numbers"
def norm_ip(img, min, max):
img.clamp_(min=min, max=max)
img.add_(-min).div_(max - min + 1e-5)
def norm_range(t, range):
if range is not None:
norm_ip(t, range[0], range[1])
else:
norm_ip(t, float(t.min()), float(t.max()))
if scale_each is True:
for t in tensor: # loop over mini-batch dimension
norm_range(t, range)
else:
norm_range(tensor, range)
if tensor.size(0) == 1:
return tensor.squeeze(0)
# make the mini-batch of images into a grid
nmaps = tensor.size(0)
xmaps = min(nrow, nmaps)
ymaps = int(math.ceil(float(nmaps) / xmaps))
height, width = int(tensor.size(2) +
padding), int(tensor.size(3) + padding)
num_channels = tensor.size(1)
# grid = tensor.new_full((num_channels, height * ymaps + padding, width * xmaps + padding), pad_value)
grid = np.zeros((num_channels, height * ymaps + padding,
width * xmaps + padding)) + pad_value
k = 0
for y in irange(ymaps):
for x in irange(xmaps):
if k >= nmaps:
break
# sub_grid=grid[:, (y * height + padding):(y * height + padding+height - padding) ][:,:,(x * width + padding):(x * width + padding+width - padding)]
# torch.copy(tensor[k],sub_grid)
grid[:, (y * height + padding):(y * height + padding + height -
padding),
(x * width + padding):(x * width + padding + width -
padding)] = tensor[k].numpy()
# torch.copy(tensor[k],torch.narrow(torch.narrow(grid,1, y * height + padding, height - padding)\
# ,2, x * width + padding, width - padding) )
k = k + 1
return torch.Tensor(grid)
