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import torch
from torch import nn
import torch.nn.functional as F
from modules.util import ResBlock2d, SameBlock2d, UpBlock2d, DownBlock2d
from modules.dense_motion import DenseMotionNetwork
class OcclusionAwareGenerator(nn.Module):
"""
Generator that given source image and and keypoints try to transform image according to movement trajectories
induced by keypoints. Generator follows Johnson architecture.
"""
def __init__(self, num_channels, num_kp, block_expansion, max_features, num_down_blocks,
num_bottleneck_blocks, estimate_occlusion_map=False, dense_motion_params=None, estimate_jacobian=False):
super(OcclusionAwareGenerator, self).__init__()
if dense_motion_params is not None:
self.dense_motion_network = DenseMotionNetwork(num_kp=num_kp, num_channels=num_channels,
estimate_occlusion_map=estimate_occlusion_map,
**dense_motion_params)
else:
self.dense_motion_network = None
self.first = SameBlock2d(num_channels, block_expansion, kernel_size=(7, 7), padding=(3, 3))
down_blocks = []
for i in range(num_down_blocks):
in_features = min(max_features, block_expansion * (2 ** i))
out_features = min(max_features, block_expansion * (2 ** (i + 1)))
down_blocks.append(DownBlock2d(in_features, out_features, kernel_size=(3, 3), padding=(1, 1)))
self.down_blocks = nn.ModuleList(down_blocks)
up_blocks = []
for i in range(num_down_blocks):
in_features = min(max_features, block_expansion * (2 ** (num_down_blocks - i)))
out_features = min(max_features, block_expansion * (2 ** (num_down_blocks - i - 1)))
up_blocks.append(UpBlock2d(in_features, out_features, kernel_size=(3, 3), padding=(1, 1)))
self.up_blocks = nn.ModuleList(up_blocks)
self.bottleneck = torch.nn.Sequential()
in_features = min(max_features, block_expansion * (2 ** num_down_blocks))
for i in range(num_bottleneck_blocks):
self.bottleneck.add_module('r' + str(i), ResBlock2d(in_features, kernel_size=(3, 3), padding=(1, 1)))
self.final = nn.Conv2d(block_expansion, num_channels, kernel_size=(7, 7), padding=(3, 3))
self.estimate_occlusion_map = estimate_occlusion_map
self.num_channels = num_channels
def deform_input(self, inp, deformation):
_, h_old, w_old, _ = deformation.shape
_, _, h, w = inp.shape
if h_old != h or w_old != w:
deformation = deformation.permute(0, 3, 1, 2)
deformation = F.interpolate(deformation, size=(h, w), mode='bilinear')
deformation = deformation.permute(0, 2, 3, 1)
return F.grid_sample(inp, deformation)
def forward(self, source_image, kp_driving, kp_source):
# Encoding (downsampling) part
out = self.first(source_image)
for i in range(len(self.down_blocks)):
out = self.down_blocks[i](out)
# Transforming feature representation according to deformation and occlusion
output_dict = {}
if self.dense_motion_network is not None:
dense_motion = self.dense_motion_network(source_image=source_image, kp_driving=kp_driving,
kp_source=kp_source)
output_dict['mask'] = dense_motion['mask']
output_dict['sparse_deformed'] = dense_motion['sparse_deformed']
if 'occlusion_map' in dense_motion:
occlusion_map = dense_motion['occlusion_map']
output_dict['occlusion_map'] = occlusion_map
else:
occlusion_map = None
deformation = dense_motion['deformation']
out = self.deform_input(out, deformation)
if occlusion_map is not None:
if out.shape[2] != occlusion_map.shape[2] or out.shape[3] != occlusion_map.shape[3]:
occlusion_map = F.interpolate(occlusion_map, size=out.shape[2:], mode='bilinear')
out = out * occlusion_map
output_dict["deformed"] = self.deform_input(source_image, deformation)
# Decoding part
out = self.bottleneck(out)
for i in range(len(self.up_blocks)):
out = self.up_blocks[i](out)
out = self.final(out)
out = F.sigmoid(out)
output_dict["prediction"] = out
return output_dict
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