def __call__(self, features):
upsampled_inputs = [
F.interpolate(x,
output_size=features[0].shape[2:],
mode='linear',
align_corners=False,
half_pixel=True) for x in features
]
inputs = F.concatenate(*upsampled_inputs, axis=1)
out = self.conv2d(inputs,
self.hparams['channels'],
kernel_size=1,
stride=1,
bias=False,
name='convs/0/conv')
out = F.relu(self.batch_norm(out, name='convs/0/bn'))
out = self.conv2d(out,
self.hparams['num_classes'],
kernel_size=1,
stride=1,
bias=True,
name='conv_seg')
out = F.interpolate(out,
output_size=self.output_size,
mode='linear',
align_corners=False,
half_pixel=True)
if self.test:
return F.softmax(out, axis=1)
return out
def layer5_1(x):
pad5_1 = F.pad(x, (1, 1, 1, 1), 'reflect')
conv5_1 = PF.convolution(
pad5_1, 256, kernel=(
3, 3), stride=(
1, 1), name='layer5_1.1')
conv5_1 = F.instance_normalization(
conv5_1, gamma=None, beta=None, channel_axis=1)
conv5_1 = PF.prelu(conv5_1, name='layer5_1.3')
up5_1 = F.interpolate(
conv5_1,
scale=(
2,
2),
mode='nearest',
align_corners=False)
pad5_2 = F.pad(up5_1, (1, 1, 1, 1), 'reflect')
conv5_2 = PF.convolution(
pad5_2, 64, kernel=(
3, 3), stride=(
1, 1), name='layer5_1.6')
conv5_2 = F.instance_normalization(
conv5_2, gamma=None, beta=None, channel_axis=1)
conv5_2 = PF.prelu(conv5_2, name='layer5_1.8')
up5_2 = F.interpolate(
conv5_2,
scale=(
2,
2),
mode='nearest',
align_corners=False)
return up5_2
def rrdb_net(x, num_output_channel, num_rrdb_blocks, growth_channel=32):
'''
:param x: input image
:param num_output_channel: number of output channels
:param num_rrdb_blocks: number of residual blocks
:param growth_channel: growth channel (no. of intermediate channel)
:return:
'''
fea = PF.convolution(x,
num_output_channel,
kernel=(3, 3),
stride=(1, 1),
pad=(1, 1),
name='conv_first')
h = fea
with nn.parameter_scope('RRDB_trunk'):
for i in range(num_rrdb_blocks):
with nn.parameter_scope('{}'.format(i)):
h = rrdb(h, num_output_channel, growth_channel)
trunk_conv = PF.convolution(h,
num_output_channel,
kernel=(3, 3),
stride=(1, 1),
pad=(1, 1),
name='trunk_conv')
fea = fea + trunk_conv
up_conv1 = F.leaky_relu(PF.convolution(F.interpolate(fea,
scale=(2, 2),
mode='nearest'),
num_output_channel,
kernel=(3, 3),
stride=(1, 1),
pad=(1, 1),
name='upconv1'),
alpha=0.2)
up_conv2 = F.leaky_relu(PF.convolution(F.interpolate(up_conv1,
scale=(2, 2),
mode='nearest'),
num_output_channel,
kernel=(3, 3),
stride=(1, 1),
pad=(1, 1),
name='upconv2'),
alpha=0.2)
hr_conv = F.leaky_relu(PF.convolution(up_conv2,
num_output_channel,
kernel=(3, 3),
stride=(1, 1),
pad=(1, 1),
name='HRconv'),
alpha=0.2)
conv_last = PF.convolution(hr_conv,
3,
kernel=(3, 3),
stride=(1, 1),
pad=(1, 1),
name='conv_last')
return conv_last
def interpolate_nn(image, frame, scale):
'''
Linear Interpolation on Variable image and frame
Args:
image : image (Variable)
frame : frame (Variable)
Returns
linear interpolated image and frame
'''
image = F.interpolate(image, scale)
frame = F.interpolate(frame, scale)
return image, frame
def backward_impl(self, inputs, outputs, prop_down, accum):
# inputs: [inputs_fwd_graph] + [inputs_bwd_graph] or
# [inputs_fwd_graph] + [outputs_fwd_graph] + [inputs_bwd_graph]
# Args
# output_size is the primary argument even if `scale` specified.
output_size = self.forward_func.info.args["output_size"]
mode = self.forward_func.info.args["mode"]
align_corners = self.forward_func.info.args["align_corners"]
# Inputs
x0 = inputs[0].data
dy = inputs[1].data
# Outputs
dx0 = outputs[0].data
# Grads of inputs
g_x0 = inputs[0].grad
g_dy = inputs[1].grad
# Grads of outputs
g_dx0 = outputs[0].grad
# Computation
if prop_down[1]:
g_dy_ = F.interpolate(
g_dx0, output_size=output_size, mode=mode, align_corners=align_corners)
if accum[1]:
g_dy += g_dy_
else:
g_dy.copy_from(g_dy_)
def get_model(args, test=False):
"""
Create computation graph and variables.
"""
image = nn.Variable(
[args.batch_size, 3, args.image_height, args.image_width])
label = nn.Variable(
[args.batch_size, 1, args.image_height, args.image_width])
mask = nn.Variable(
[args.batch_size, 1, args.image_height, args.image_width])
pred = model.deeplabv3plus_model(image,
args.output_stride,
args.num_class,
test=test,
fix_params=False)
if pred.shape != label.shape:
pred = F.interpolate(pred,
output_size=(label.shape[2], label.shape[3]),
mode='linear')
loss = F.sum(
F.softmax_cross_entropy(pred, label, axis=1) * mask) / F.sum(mask)
Model = namedtuple('Model', ['image', 'label', 'mask', 'pred', 'loss'])
return Model(image, label, mask, pred, loss)
def Upsample(h, nmap_out, scope_name, scale=2):
with nn.parameter_scope(scope_name):
def sn_w(w): return PF.spectral_norm(w, dim=0)
h = F.interpolate(h, scale=(scale, scale), mode="nearest")
h = PF.convolution(h, nmap_out*2, (3, 3), pad=(1, 1),
apply_w=sn_w, with_bias=False, name="conv1")
h = PF.batch_normalization(h)
h = GLU(h)
return h
def test_interpolate_nearest_double_backward(seed, inshape, outsize, scale,
sdim_only, align_corners,
half_pixel, half_pixel_for_nn,
channel_last, ctx, func_name):
if channel_last and func_name == "Interpolate":
pytest.skip("Interpolate with channel_last is only supported in CUDA.")
if sdim_only and channel_last:
pytest.skip(
"Interpolate for spatial dimension only data is only supported for channel_first option."
)
from nbla_test_utils import backward_function_tester, grad_function_forward_function_output
from nnabla.backward_function.interpolate import InterpolateDataGrad
rng = np.random.RandomState(seed)
inputs = [rng.randn(*inshape).astype(np.float32)]
func_args = [
scale, outsize, 'nearest', align_corners, half_pixel,
half_pixel_for_nn, channel_last
]
# 2nd-order
backward_function_tester(rng,
F.interpolate,
inputs,
func_args=func_args,
atol_f=1e-6,
atol_accum=1e-2,
dstep=1e-3,
ctx=ctx)
# 3rd-order
# F.interpolate takes scale and output_size while InterpolateDataGrad takes only output_size
# for passing kwargs in the nn.grad, same as F.Interpolate
import nnabla as nn
import math
vinputs = [
nn.Variable(inp.shape) if inp is not None else None for inp in inputs
]
y = F.interpolate(*(vinputs + func_args))
x = inputs[0]
if scale:
input_size = x.shape[-len(scale) -
1:-1] if channel_last else x.shape[-len(scale):]
output_size = [
int(math.floor(s * d)) for d, s in zip(input_size, scale)
]
else:
output_size = outsize
df = InterpolateDataGrad(ctx, *([output_size] + func_args[2:]))
df.xshape = x.shape
ginputs = [rng.randn(*y.shape)]
backward_function_tester(rng,
df,
ginputs,
func_args=[],
ctx=ctx,
atol_f=1e-6,
atol_accum=5e-2,
non_accum_check=True)
def upsample(x, name, with_conv):
with nn.parameter_scope(name):
B, C, H, W = x.shape
x = F.interpolate(x, scale=(2, 2), mode="nearest", align_corners=True)
assert x.shape == (B, C, H * 2, W * 2)
if with_conv:
x = conv(x, C, "upsample_conv")
assert x.shape == (B, C, H * 2, W * 2)
return x
def upsample(x, factor, training, left_shape=None):
if len(x.shape) == 4:
if training:
h = F.interpolate(x,
scale=(factor, factor),
mode='linear',
align_corners=True)
else:
h = F.interpolate(x,
output_size=(left_shape[2] // 4,
left_shape[3] // 4),
mode='linear',
align_corners=True)
elif len(x.shape) == 5:
planes = x.shape[1]
kernel_size = 2 * factor - factor % 2
stride = int(factor)
pad = int(math.ceil((factor - 1) / 2.))
scale_factor = (kernel_size + 1) // 2
if kernel_size % 2 == 1:
center = scale_factor - 1
else:
center = scale_factor - 0.5
bilinear_kernel = np.zeros([kernel_size, kernel_size, kernel_size],
dtype=np.float32)
for i in range(kernel_size):
for j in range(kernel_size):
for d in range(kernel_size):
bilinear_kernel[
i, j, d] = (1 - abs(i - center) / scale_factor) * (
1 - abs(j - center) / scale_factor) * (
1 - abs(d - center) / scale_factor)
w_filter = np.zeros([1, planes, kernel_size, kernel_size, kernel_size])
for i in range(planes):
w_filter[:, i, :, :, :] = bilinear_kernel
h = PF.deconvolution(x,
planes,
kernel=(kernel_size, kernel_size, kernel_size),
pad=(pad, pad, pad),
stride=(stride, stride, stride),
w_init=w_filter,
fix_parameters=True,
group=planes)
return h
def upsample(h, maps, up, test=False, name="convblock"):
if up == "nearest":
h = PF.convolution(h, maps, (3, 3), (1, 1), name=name)
h = F.interpolate(h, scale=(2, 2), mode="nearest")
elif up == "linear":
h = PF.convolution(h, maps, (3, 3), (1, 1), name=name)
h = F.interpolate(h, scale=(2, 2), mode="linear")
elif up == "unpooling":
h = PF.convolution(h, maps, (3, 3), (1, 1), name=name)
h = F.unpooling(h, (2, 2))
elif up == "deconv":
h = PF.deconvolution(h, maps * 2, (2, 2), (0, 0), (2, 2), name=name)
else:
raise ValueError(
'Set "up" option in ["nearest", "linear", "unpooling", "deconv"]')
h = PF.batch_normalization(h, batch_stat=not test, name=name)
h = F.relu(h)
return h
def up_block(input, output_channels=64, stride=1, scope='up_block'):
with nn.parameter_scope(scope):
net = conv2d(input, output_channels, (3, 3),
(stride, stride), name='conv_1')
net = F.leaky_relu(net, 0.2)
net = conv2d(net, output_channels, (3, 3),
(stride, stride), name='conv_2')
net = F.leaky_relu(net, 0.2)
net = F.interpolate(net, scale=(2, 2), channel_last=True)
return net
def deform_input(inp, deformation):
_, h_old, w_old, _ = deformation.shape
_, _, h, w = inp.shape
if h_old != h or w_old != w:
deformation = F.transpose(deformation, (0, 3, 1, 2))
deformation = F.interpolate(deformation, output_size=(
h, w), mode="linear", align_corners=False, half_pixel=True)
deformation = F.transpose(deformation, (0, 2, 3, 1))
return F.warp_by_grid(inp, deformation, align_corners=True)
def conv_up(x, out_ch, kernel=(3, 3), stride=(1, 1), pad=(1, 1), name=None):
upsample = F.interpolate(x,
scale=(2, 2),
mode='nearest',
align_corners=False)
conv = PF.convolution(upsample,
out_ch,
kernel=kernel,
pad=pad,
stride=stride,
name=name)
return conv
def interpolate_data_grad_backward(inputs, output_size, mode, align_corners=True,
half_pixel=False, half_pixel_for_nn=False, channel_last=False):
"""
Args:
inputs (list of nn.Variable): Incomming grads/inputs to/of the forward function.
kwargs (dict of arguments): Dictionary of the corresponding function arguments.
Return:
list of Variable: Return the gradients wrt inputs of the corresponding function.
"""
gdx = inputs[0]
gdy = F.interpolate(gdx, None, output_size, mode, align_corners,
half_pixel, half_pixel_for_nn, channel_last)
return gdy
def loss_dis_real(logits, rec_imgs, part, img, lmd=1.0):
# loss = 0.0
# Hinge loss (following the official implementation)
loss = F.mean(F.relu(0.2*F.rand(shape=logits.shape) + 0.8 - logits))
# Reconstruction loss for rec_img_big (reconstructed from 8x8 features of the original image)
# Reconstruction loss for rec_img_small (reconstructed from 8x8 features of the resized image)
# Reconstruction loss for rec_img_part (reconstructed from a part of 16x16 features of the original image)
if lmd > 0.0:
# Ground-truth
img_128 = F.interpolate(img, output_size=(128, 128))
img_256 = F.interpolate(img, output_size=(256, 256))
img_half = F.where(F.greater_scalar(
part[0], 0.5), img_256[:, :, :128, :], img_256[:, :, 128:, :])
img_part = F.where(F.greater_scalar(
part[1], 0.5), img_half[:, :, :, :128], img_half[:, :, :, 128:])
# Integrated perceptual loss
loss = loss + lmd * \
reconstruction_loss_lpips(rec_imgs, [img_128, img_part])
return loss
def get_t_d(conf, r_inputs, d_data):
"""
Create Real and fake temoral discriminators
"""
# to crop out unstable part for temporal discriminator, details in TecoGAN supplemental paper
crop_size_dt = int(conf.train.crop_size * 4 * conf.gan.crop_dt)
offset_dt = (conf.train.crop_size * 4 - crop_size_dt) // 2
crop_size_dt = conf.train.crop_size * 4 - offset_dt * 2
paddings = (0, 0, offset_dt, offset_dt, offset_dt, offset_dt, 0, 0)
with nn.parameter_scope("discriminator"):
real_warp = warp_by_flow(d_data.t_targets, d_data.t_vel)
real_warp = space_to_depth_disc(real_warp, d_data.t_batch)
# equivalent to tf.image.crop_to_bounding_box
real_warp = real_warp[:, offset_dt:offset_dt + crop_size_dt,
offset_dt:offset_dt + crop_size_dt, :]
real_warp = F.pad(real_warp, paddings)
before_warp = space_to_depth_disc(d_data.t_targets, d_data.t_batch)
t_input = space_to_depth_disc(r_inputs[:, :d_data.t_size, :, :, :],
d_data.t_batch)
# resizing using bilinear interpolation
input_hi = F.interpolate(t_input,
scale=(4, 4),
mode='linear',
channel_last=True)
real_warp = F.concatenate(before_warp, real_warp, input_hi)
tdiscrim_real_output, real_layers = discriminator(real_warp)
fake_warp = warp_by_flow(d_data.t_gen_output, d_data.t_vel)
fake_warp = space_to_depth_disc(fake_warp, d_data.t_batch)
fake_warp = fake_warp[:, offset_dt:offset_dt + crop_size_dt,
offset_dt:offset_dt + crop_size_dt, :]
fake_warp = F.pad(fake_warp, paddings)
before_warp = space_to_depth_disc(d_data.t_gen_output,
d_data.t_batch,
inplace=False)
fake_warp = F.concatenate(before_warp, fake_warp, input_hi)
tdiscrim_fake_output, fake_layers = discriminator(fake_warp)
temporal_disc = collections.namedtuple(
'temporal_disc', 'tdiscrim_real_output,'
'real_layers, tdiscrim_fake_output, fake_layers')
return temporal_disc(tdiscrim_real_output=tdiscrim_real_output,
real_layers=real_layers,
tdiscrim_fake_output=tdiscrim_fake_output,
fake_layers=fake_layers)
def spade(x, m, hidden_dim=128, kernel=(3, 3), norm_type="in"):
"""
Spatially-Adaptive Normalization proposed in Semantic Image Synthesis with Spatially-Adaptive Normalization (https://arxiv.org/pdf/1903.07291.pdf).
Args:
x (nn.Variable): Input variable for spade layer.
m (nn.Variable):
Spatial condition variable like object_id mask segmentation.
This is for generating adaptive scale(gamma) and adaptice bias(beta) applied after normalization.
hidden_dim (int): Hidden dims for first convolution applied to m.
kernel (list of int): Kernel shapes for convolutions.
norm_type (str) : A type of normalization. ["in", "bn"] are supported now.
"""
# x: (N, Cx, H, W), m: (N, Cm, H, W)
assert len(x.shape) == 4 and len(m.shape) == 4
pad = tuple(i // 2 for i in kernel)
c_dim = x.shape[1]
conv_args = dict(kernel=kernel, pad=pad)
with ps("spatial_adaptive_normalization"):
normalized = _normalize(x, norm_type)
m = F.interpolate(m, output_size=x.shape[2:], mode="nearest")
with ps("shared"):
actv = F.relu(
PF.convolution(m,
hidden_dim,
w_init=w_init(m, hidden_dim),
**conv_args))
with ps("gamma"):
gamma = PF.convolution(actv,
c_dim,
w_init=w_init(actv, c_dim),
**conv_args)
with ps("beta"):
beta = PF.convolution(actv,
c_dim,
w_init=w_init(actv, c_dim),
**conv_args)
return normalized * gamma + beta
def deeplabv3plus_model(x,
output_stride,
num_classes,
test=False,
fix_params=False):
'''Encoder
'''
# Get decoder endpoints from backbone
endpoints = xception.xception_65(x, test=test, fix_params=fix_params)
low_level_features = endpoints['Decoder End Point 1']
encoder_output = atrous_spatial_pyramid_pooling(
endpoints['Decoder End Point 2'],
output_stride,
test=test,
fix_params=fix_params)
with nn.parameter_scope("concat_projection"):
encoder_output = PF.convolution(encoder_output,
256, (1, 1),
with_bias=False,
fix_parameters=fix_params)
encoder_output = F.relu(
PF.batch_normalization(encoder_output,
batch_stat=not test,
fix_parameters=fix_params))
'''Decoder
'''
with nn.parameter_scope("decoder"):
with nn.parameter_scope("upsample1"):
upsampled = F.interpolate(
encoder_output,
output_size=(low_level_features.shape[2],
low_level_features.shape[2]),
mode='linear')
h = decoder(low_level_features,
upsampled,
num_classes,
test=test,
fix_params=fix_params)
return h
def hg_module(n, x):
with nn.parameter_scope(f"{n - 1}.0.0"):
up1 = ops[n - 1][0](x)
low1 = F.max_pooling(x, kernel=(2, 2), stride=(2, 2))
with nn.parameter_scope(f"{n - 1}.1.0"):
low1 = ops[n - 1][1](low1)
if n > 1:
low2 = hg_module(n - 1, low1)
else:
with nn.parameter_scope(f"{n - 1}.3.0"):
low2 = ops[n - 1][3](low1)
with nn.parameter_scope(f"{n - 1}.2.0"):
low3 = ops[n - 1][2](low2)
up2 = F.interpolate(low3, scale=(2, 2), mode="nearest")
out = up1 + up2
return out
def upblock(x,
out_features,
kernel_size=3,
padding=1,
groups=1,
test=False,
comm=None):
if comm:
batchnorm = functools.partial(PF.sync_batch_normalization,
comm=comm,
group='world',
axes=[1],
decay_rate=0.9,
eps=1e-05,
batch_stat=not test)
else:
# 1 GPU
batchnorm = functools.partial(PF.batch_normalization,
axes=[1],
decay_rate=0.9,
eps=1e-05,
batch_stat=not test)
inmaps, outmaps = x.shape[1], out_features
k_w = I.calc_normal_std_he_forward(
inmaps, outmaps, kernel=(kernel_size, kernel_size)) / np.sqrt(2.)
k_b = I.calc_normal_std_he_forward(inmaps, outmaps) / np.sqrt(2.)
w_init = I.UniformInitializer((-k_w, k_w))
b_init = I.UniformInitializer((-k_b, k_b))
out = F.interpolate(x, scale=(2, 2), mode="nearest")
with nn.parameter_scope("upblock"):
out = PF.convolution(out,
outmaps=out_features,
kernel=(kernel_size, kernel_size),
pad=(padding, padding),
group=groups,
w_init=w_init,
b_init=b_init)
out = batchnorm(out)
out = F.relu(out, inplace=True)
return out
def __call__(self, img0, img1, normalize=False, mean_batch=False):
"""
Args:
img0, img1(Variable): Variable containing images. N batch images can be used.
normalize(bool): if True, assumes inputs are in [0., 1.] and scales the inputs between [-1., +1.].
if False, assumes inputs are in [-1., +1.]
"""
assert img0.shape == img1.shape, "img0 and img1 have different shape."
assert isinstance(img0, nn.Variable), "img0 is not Variable."
assert isinstance(img1, nn.Variable), "img1 is not Variable."
if normalize:
# scales the input between [-1., +1.]
img0 = 2 * img0 - 1
img1 = 2 * img1 - 1
if self.apply_scale:
img0 = (img0 - self._shift) / self._scale
img1 = (img1 - self._shift) / self._scale
dists = compute_each_feat_dist(img0,
img1,
feat_extractor=self.feat_extractor)
if self.spatial:
# note that this upsampling method is different from the original LPIPS.
# in the original implementation, it is torch.nn.upsample(mode="bilinear")
dists = [
F.interpolate(dist * (1. * img0.shape[2] / dist.shape[2]),
output_size=img0.shape[2:]) for dist in dists
]
else:
dists = [
F.mean(dist, axis=[2, 3], keepdims=True) for dist in dists
]
# returns N scores ((N, 1, 1, 1))
lpips_val = F.sum(F.stack(*dists), axis=0)
if mean_batch:
lpips_val = F.mean(lpips_val, axis=0)
return lpips_val
def anti_alias_interpolate(input, channels, scale):
# no trainable parameters exist.
if scale == 1.0:
# no interpolation executed
return F.identity(input)
sigma = (1 / scale - 1) / 2
kernel_size = 2 * round(sigma * 4) + 1
ka = kernel_size // 2
if kernel_size % 2 == 0:
kb = ka - 1
else:
kb = ka
kernel_size = [kernel_size, kernel_size]
sigma = [sigma, sigma]
kernel = 1
xa = F.reshape(F.arange(0, kernel_size[0]), (-1, 1))
ya = F.reshape(F.arange(0, kernel_size[1]), (1, -1))
meshgrids = (F.tile(xa,
(1, kernel_size[1])), F.tile(ya, (kernel_size[0], 1)))
for size, std, mgrid in zip(kernel_size, sigma, meshgrids):
mean = (size - 1) / 2
kernel *= F.exp(-(mgrid - mean)**2 / (2 * std**2))
kernel = kernel / F.sum(kernel, keepdims=True)
# Reshape to depthwise convolutional weight
kernel = F.reshape(kernel, (1, 1) + kernel.shape)
kernel = F.broadcast(kernel, (channels, 1) + tuple(kernel_size))
# if using the pre-computed kernel, no need to compute here.
out = F.pad(input, (ka, kb, ka, kb))
out = F.convolution(out, weight=kernel, group=channels)
out = F.interpolate(out, scale=(scale, scale), mode="nearest")
return out
def hour_glass(inp, depth, num_features):
# Upper branch
up1 = inp
with nn.parameter_scope('b1_' + str(depth)):
up1 = conv_block(up1, num_features, num_features)
# Lower branch
low1 = F.average_pooling(inp, (2, 2), stride=(2, 2))
with nn.parameter_scope('b2_' + str(depth)):
low1 = conv_block(low1, num_features, num_features)
if depth > 1:
low2 = hour_glass(low1, depth - 1, num_features)
else:
low2 = low1
with nn.parameter_scope('b2_plus_' + str(depth)):
low2 = conv_block(low2, num_features, num_features)
low3 = low2
with nn.parameter_scope('b3_' + str(depth)):
low3 = conv_block(low3, num_features, num_features)
up2 = F.interpolate(low3, scale=(2, 2), mode='nearest')
return up1 + up2
def __init__(self, nf, image_shape, ext_upsamples=0):
ext_upsamples = int(ext_upsamples)
assert isinstance(ext_upsamples, int) and 0 <= ext_upsamples <= 2,\
"ext_upsamples must be in the range of [0, 2]."
self.nf = nf
self.image_shape = image_shape
self.num_upsample = 5 + ext_upsamples
self.head_0 = SpadeResidualBlock(16 * nf)
self.G_middle_0 = SpadeResidualBlock(16 * nf)
self.G_middle_1 = SpadeResidualBlock(16 * nf)
self.up_0 = SpadeResidualBlock(8 * nf)
self.up_1 = SpadeResidualBlock(4 * nf)
self.up_2 = SpadeResidualBlock(2 * nf)
self.up_3 = SpadeResidualBlock(nf)
if self.num_upsample > 6:
self.up_4 = SpadeResidualBlock(nf // 2)
self.up = lambda x: F.interpolate(x, scale=(2, 2), mode="nearest")
def decoder(x, upsampled, num_classes, test=False, fix_params=False):
# Project low-level features
with nn.parameter_scope("feature_projection0"):
h = PF.convolution(x,
48, (1, 1),
with_bias=False,
fix_parameters=fix_params)
h = F.relu(
PF.batch_normalization(h,
batch_stat=not test,
fix_parameters=fix_params))
h = F.concatenate(upsampled, h, axis=1)
for i in range(2):
with nn.parameter_scope("decoder_conv" + str(i)):
h = xception.separable_conv_with_bn(h,
256,
last_block=True,
eps=1e-05,
out=True,
test=test,
fix_params=fix_params)
with nn.parameter_scope("logits/affine"):
h = PF.convolution(h,
num_classes, (1, 1),
with_bias=True,
fix_parameters=fix_params) # no activation
with nn.parameter_scope("upsample2"):
h = F.interpolate(h,
output_size=(h.shape[2] * 4 - 3, h.shape[2] * 4 - 3),
mode='linear')
return h
def graph(x0):
# F.swish -> F.interpolate
x1 = F.swish(x0)
x1.apply(recompute=True)
x2 = F.interpolate(x1, scale=(2,))
return x2
def visualize(self, driving, source, out):
images = []
# Source image with keypoints
if isinstance(source, nn.Variable):
source = source.d
kp_source = out['kp_source']['value'].d
source = np.transpose(source, [0, 2, 3, 1])
images.append((source, kp_source))
# Equivariance visualization, not used when animation (eval)
if 'transformed_frame' in out:
transformed = out['transformed_frame'].d
transformed = np.transpose(transformed, [0, 2, 3, 1])
transformed_kp = out['transformed_kp']['value'].d
images.append((transformed, transformed_kp))
# Driving image with keypoints
kp_driving = out['kp_driving']['value'].d
if isinstance(driving, nn.Variable):
driving = driving.d
driving = np.transpose(driving, [0, 2, 3, 1])
images.append((driving, kp_driving))
# Deformed image
if 'deformed' in out:
deformed = out['deformed'].d
deformed = np.transpose(deformed, [0, 2, 3, 1])
images.append(deformed)
# Result with and without keypoints
prediction = out['prediction'].d
prediction = np.transpose(prediction, [0, 2, 3, 1])
if 'kp_norm' in out:
kp_norm = out['kp_norm']['value'].d
images.append((prediction, kp_norm))
images.append(prediction)
# Occlusion map
if 'occlusion_map' in out:
with nn.auto_forward():
occlusion_map = F.tile(out['occlusion_map'], (1, 3, 1, 1))
occlusion_map = F.interpolate(
occlusion_map, output_size=source.shape[1:3], mode='nearest')
occlusion_map = np.transpose(occlusion_map.d, [0, 2, 3, 1])
images.append(occlusion_map)
# Deformed images according to each individual transform
if 'sparse_deformed' in out:
full_mask = []
for i in range(out['sparse_deformed'].shape[1]):
with nn.auto_forward():
image = out['sparse_deformed'][:, i]
image = F.interpolate(
image, output_size=source.shape[1:3], mode='nearest')
mask = F.tile(out['mask'][:, i:(i + 1)], (1, 3, 1, 1))
mask = F.interpolate(
mask, output_size=source.shape[1:3], mode='nearest')
image = np.transpose(image.d, (0, 2, 3, 1))
mask = np.transpose(mask.d, (0, 2, 3, 1))
if i != 0:
color = np.array(self.colormap(
(i - 1) / (out['sparse_deformed'].shape[1] - 1)))[:3]
else:
color = np.array((0, 0, 0))
color = color.reshape((1, 1, 1, 3))
images.append(image)
if i != 0:
images.append(mask * color)
else:
images.append(mask)
full_mask.append(mask * color)
images.append(sum(full_mask))
image = self.create_image_grid(*images)
image = (255 * image).astype(np.uint8)
return image
def pcd_align(fea1, fea2):
"""
Alignment module using Pyramid, Cascading and Deformable convolution
with 3 pyramid levels[L1, L2, L3].
"""
num_filters = 64
deformable_groups = 8
kernel_sz, stride_ln, pad_ln = 3, 1, 1
def deform_conv(fea, offset_input, name):
"""
deformable convolution block
"""
with nn.parameter_scope(name):
channels_ = deformable_groups * 3 * kernel_sz * kernel_sz
conv_offset_mask = conv2d(offset_input, channels_, kernel_sz, stride_ln, pad_ln,
bias=True,
name='conv_offset_mask')
channels = channels_ / 3
offset = conv_offset_mask[:, :2 * channels, :, :]
mask = F.sigmoid(
conv_offset_mask[:, 2 * channels:3 * channels, :, :])
deform_conv = PF.deformable_convolution(fea, num_filters, (kernel_sz, kernel_sz),
offset, mask,
deformable_group=deformable_groups,
stride=(
stride_ln, stride_ln),
pad=(pad_ln, pad_ln),
dilation=(1, 1), with_bias=True)
return deform_conv
y = []
with nn.parameter_scope('pcd_align'):
# fea1
# L3: level 3, 1/4 spatial size
l3_offset = F.concatenate(fea1[2], fea2[2], axis=1)
l3_offset = F.leaky_relu(
conv2d(l3_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l3_offset_conv1_1'))
l3_offset = F.leaky_relu(
conv2d(l3_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l3_offset_conv2_1'))
l3_fea = F.leaky_relu(deform_conv(
fea1[2], l3_offset, name='l3_dcnpack_1'))
# L2: level 2, 1/2 spatial size
l2_offset = F.concatenate(fea1[1], fea2[1], axis=1)
l2_offset = F.leaky_relu(
conv2d(l2_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l2_offset_conv1_1'))
l3_offset = F.interpolate(l3_offset, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l2_offset = F.leaky_relu(
conv2d(F.concatenate(l2_offset, l3_offset * 2, axis=1), num_filters, kernel_sz,
stride_ln, pad_ln, bias=True,
name='l2_offset_conv2_1'))
l2_offset = F.leaky_relu(
conv2d(l2_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l2_offset_conv3_1'))
l2_fea = deform_conv(fea1[1], l2_offset, name='l2_dcnpack_1')
l3_fea = F.interpolate(l3_fea, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l2_fea = F.leaky_relu(
conv2d(F.concatenate(l2_fea, l3_fea, axis=1), num_filters, kernel_sz, stride_ln, pad_ln,
bias=True, name='l2_fea_conv_1'))
# L1: level 1, original spatial size
l1_offset = F.concatenate(fea1[0], fea2[0], axis=1)
l1_offset = F.leaky_relu(
conv2d(l1_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l1_offset_conv1_1'))
l2_offset = F.interpolate(l2_offset, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l1_offset = F.leaky_relu(
conv2d(F.concatenate(l1_offset, l2_offset * 2, axis=1), num_filters, kernel_sz,
stride_ln, pad_ln, bias=True,
name='l1_offset_conv2_1'))
l1_offset = F.leaky_relu(
conv2d(l1_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l1_offset_conv3_1'))
l1_fea = deform_conv(fea1[0], l1_offset, name='l1_dcnpack_1')
l2_fea = F.interpolate(l2_fea, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l1_fea = conv2d(F.concatenate(l1_fea, l2_fea, axis=1), num_filters, kernel_sz, stride_ln,
pad_ln, bias=True,
name='l1_fea_conv_1')
y.append(l1_fea)
# fea2
# L3: level 3, 1/4 spatial size
l3_offset = F.concatenate(fea2[2], fea1[2], axis=1)
l3_offset = F.leaky_relu(
conv2d(l3_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l3_offset_conv1_2'))
l3_offset = F.leaky_relu(
conv2d(l3_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l3_offset_conv2_2'))
l3_fea = F.leaky_relu(deform_conv(
fea2[2], l3_offset, name='l3_dcnpack_2'))
# L2: level 2, 1/2 spatial size
l2_offset = F.concatenate(fea2[1], fea1[1], axis=1)
l2_offset = F.leaky_relu(
conv2d(l2_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l2_offset_conv1_2'))
l3_offset = F.interpolate(l3_offset, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l2_offset = F.leaky_relu(
conv2d(F.concatenate(l2_offset, l3_offset * 2, axis=1), num_filters, kernel_sz,
stride_ln, pad_ln, bias=True,
name='l2_offset_conv2_2'))
l2_offset = F.leaky_relu(
conv2d(l2_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l2_offset_conv3_2'))
l2_fea = deform_conv(fea2[1], l2_offset, name='l2_dcnpack_2')
l3_fea = F.interpolate(l3_fea, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l2_fea = F.leaky_relu(
conv2d(F.concatenate(l2_fea, l3_fea, axis=1), num_filters, kernel_sz, stride_ln, pad_ln,
bias=True, name='l2_fea_conv_2'))
# L1: level 1, original spatial size
l1_offset = F.concatenate(fea2[0], fea1[0], axis=1)
l1_offset = F.leaky_relu(
conv2d(l1_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l1_offset_conv1_2'))
l2_offset = F.interpolate(l2_offset, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l1_offset = F.leaky_relu(
conv2d(F.concatenate(l1_offset, l2_offset * 2, axis=1), num_filters, kernel_sz,
stride_ln, pad_ln, bias=True,
name='l1_offset_conv2_2'))
l1_offset = F.leaky_relu(
conv2d(l1_offset, num_filters, kernel_sz, stride_ln, pad_ln, bias=True,
name='l1_offset_conv3_2'))
l1_fea = deform_conv(fea2[0], l1_offset, name='l1_dcnpack_2')
l2_fea = F.interpolate(l2_fea, scale=(
2, 2), mode='linear', align_corners=False, half_pixel=True)
l1_fea = conv2d(F.concatenate(l1_fea, l2_fea, axis=1), num_filters, kernel_sz, stride_ln,
pad_ln, bias=True,
name='l1_fea_conv_2')
y.append(l1_fea)
y = F.concatenate(*y, axis=1)
return y
def Discriminator(img, label="real", scope_name="Discriminator", ndf=64):
with nn.parameter_scope(scope_name):
if type(img) is not list:
img_small = F.interpolate(img, output_size=(128, 128))
else:
img_small = img[1]
img = img[0]
def sn_w(w):
return PF.spectral_norm(w, dim=0)
# InitLayer: -> 256x256
with nn.parameter_scope("init"):
h = img
if img.shape[2] == 1024:
h = PF.convolution(h,
ndf // 8, (4, 4),
stride=(2, 2),
pad=(1, 1),
apply_w=sn_w,
with_bias=False,
name="conv1")
h = F.leaky_relu(h, 0.2)
h = PF.convolution(h,
ndf // 4, (4, 4),
stride=(2, 2),
pad=(1, 1),
apply_w=sn_w,
with_bias=False,
name="conv2")
h = PF.batch_normalization(h)
h = F.leaky_relu(h, 0.2)
elif img.shape[2] == 512:
h = PF.convolution(h,
ndf // 4, (4, 4),
stride=(2, 2),
pad=(1, 1),
apply_w=sn_w,
with_bias=False,
name="conv2")
h = F.leaky_relu(h, 0.2)
else:
h = PF.convolution(h,
ndf // 4, (3, 3),
pad=(1, 1),
apply_w=sn_w,
with_bias=False,
name="conv3")
h = F.leaky_relu(h, 0.2)
# Calc base features
f_256 = h
f_128 = DownsampleComp(f_256, ndf // 2, "down256->128")
f_64 = DownsampleComp(f_128, ndf * 1, "down128->64")
f_32 = DownsampleComp(f_64, ndf * 2, "down64->32")
# Apply SLE
f_32 = SLE(f_32, f_256, "sle256->32")
f_16 = DownsampleComp(f_32, ndf * 4, "down32->16")
f_16 = SLE(f_16, f_128, "sle128->16")
f_8 = DownsampleComp(f_16, ndf * 16, "down16->8")
f_8 = SLE(f_8, f_64, "sle64->8")
# Conv + BN + LeakyRely + Conv -> logits (5x5)
with nn.parameter_scope("last"):
h = PF.convolution(f_8,
ndf * 16, (1, 1),
apply_w=sn_w,
with_bias=False,
name="conv1")
h = PF.batch_normalization(h)
h = F.leaky_relu(h, 0.2)
logit_large = PF.convolution(h,
1, (4, 4),
apply_w=sn_w,
with_bias=False,
name="conv2")
# Another path: "down_from_small" in the official code
with nn.parameter_scope("down_from_small"):
h_s = PF.convolution(img_small,
ndf // 2, (4, 4),
stride=(2, 2),
pad=(1, 1),
apply_w=sn_w,
with_bias=False,
name="conv1")
h_s = F.leaky_relu(h_s, 0.2)
h_s = Downsample(h_s, ndf * 1, "dfs64->32")
h_s = Downsample(h_s, ndf * 2, "dfs32->16")
h_s = Downsample(h_s, ndf * 4, "dfs16->8")
fea_dec_small = h_s
logit_small = PF.convolution(h_s,
1, (4, 4),
apply_w=sn_w,
with_bias=False,
name="conv2")
# Concatenate logits
logits = F.concatenate(logit_large, logit_small, axis=1)
# Reconstruct images
rec_img_big = SimpleDecoder(f_8, "dec_big")
rec_img_small = SimpleDecoder(fea_dec_small, "dec_small")
part_ax2 = F.rand(shape=(img.shape[0], ))
part_ax3 = F.rand(shape=(img.shape[0], ))
f_16_ax2 = F.where(F.greater_scalar(part_ax2, 0.5), f_16[:, :, :8, :],
f_16[:, :, 8:, :])
f_16_part = F.where(F.greater_scalar(part_ax3, 0.5),
f_16_ax2[:, :, :, :8], f_16_ax2[:, :, :, 8:])
rec_img_part = SimpleDecoder(f_16_part, "dec_part")
if label == "real":
return logits, [rec_img_big, rec_img_small,
rec_img_part], [part_ax2, part_ax3]
else:
return logits
