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