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| # coding: utf-8 | |
| """ | |
| Appearance extractor(F) defined in paper, which maps the source image s to a 3D appearance feature volume. | |
| """ | |
| import torch | |
| from torch import nn | |
| from .util import SameBlock2d, DownBlock2d, ResBlock3d | |
| class AppearanceFeatureExtractor(nn.Module): | |
| def __init__(self, image_channel, block_expansion, num_down_blocks, max_features, reshape_channel, reshape_depth, num_resblocks): | |
| super(AppearanceFeatureExtractor, self).__init__() | |
| self.image_channel = image_channel | |
| self.block_expansion = block_expansion | |
| self.num_down_blocks = num_down_blocks | |
| self.max_features = max_features | |
| self.reshape_channel = reshape_channel | |
| self.reshape_depth = reshape_depth | |
| self.first = SameBlock2d(image_channel, block_expansion, kernel_size=(3, 3), padding=(1, 1)) | |
| 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) | |
| self.second = nn.Conv2d(in_channels=out_features, out_channels=max_features, kernel_size=1, stride=1) | |
| self.resblocks_3d = torch.nn.Sequential() | |
| for i in range(num_resblocks): | |
| self.resblocks_3d.add_module('3dr' + str(i), ResBlock3d(reshape_channel, kernel_size=3, padding=1)) | |
| def forward(self, source_image): | |
| out = self.first(source_image) # Bx3x256x256 -> Bx64x256x256 | |
| for i in range(len(self.down_blocks)): | |
| out = self.down_blocks[i](out) | |
| out = self.second(out) | |
| bs, c, h, w = out.shape # ->Bx512x64x64 | |
| f_s = out.view(bs, self.reshape_channel, self.reshape_depth, h, w) # ->Bx32x16x64x64 | |
| f_s = self.resblocks_3d(f_s) # ->Bx32x16x64x64 | |
| return f_s | |