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| import numpy as np | |
| import torch | |
| import torch.nn.functional as F | |
| from torch import nn | |
| from torch.nn import Linear, Conv2d, BatchNorm2d, PReLU, Sequential, Module | |
| from models.encoders.helpers import get_blocks, Flatten, bottleneck_IR, bottleneck_IR_SE | |
| from models.stylegan2.model import EqualLinear | |
| class GradualStyleBlock(Module): | |
| def __init__(self, in_c, out_c, spatial): | |
| super(GradualStyleBlock, self).__init__() | |
| self.out_c = out_c | |
| self.spatial = spatial | |
| num_pools = int(np.log2(spatial)) | |
| modules = [] | |
| modules += [Conv2d(in_c, out_c, kernel_size=3, stride=2, padding=1), | |
| nn.LeakyReLU()] | |
| for i in range(num_pools - 1): | |
| modules += [ | |
| Conv2d(out_c, out_c, kernel_size=3, stride=2, padding=1), | |
| nn.LeakyReLU() | |
| ] | |
| self.convs = nn.Sequential(*modules) | |
| self.linear = EqualLinear(out_c, out_c, lr_mul=1) | |
| def forward(self, x): | |
| x = self.convs(x) | |
| x = x.view(-1, self.out_c) | |
| x = self.linear(x) | |
| return x | |
| class GradualStyleEncoder(Module): | |
| def __init__(self, num_layers, mode='ir', opts=None): | |
| super(GradualStyleEncoder, self).__init__() | |
| assert num_layers in [50, 100, 152], 'num_layers should be 50,100, or 152' | |
| assert mode in ['ir', 'ir_se'], 'mode should be ir or ir_se' | |
| blocks = get_blocks(num_layers) | |
| if mode == 'ir': | |
| unit_module = bottleneck_IR | |
| elif mode == 'ir_se': | |
| unit_module = bottleneck_IR_SE | |
| self.input_layer = Sequential(Conv2d(opts.input_nc, 64, (3, 3), 1, 1, bias=False), | |
| BatchNorm2d(64), | |
| PReLU(64)) | |
| modules = [] | |
| for block in blocks: | |
| for bottleneck in block: | |
| modules.append(unit_module(bottleneck.in_channel, | |
| bottleneck.depth, | |
| bottleneck.stride)) | |
| self.body = Sequential(*modules) | |
| self.styles = nn.ModuleList() | |
| self.style_count = 18 | |
| self.coarse_ind = 3 | |
| self.middle_ind = 7 | |
| for i in range(self.style_count): | |
| if i < self.coarse_ind: | |
| style = GradualStyleBlock(512, 512, 16) | |
| elif i < self.middle_ind: | |
| style = GradualStyleBlock(512, 512, 32) | |
| else: | |
| style = GradualStyleBlock(512, 512, 64) | |
| self.styles.append(style) | |
| self.latlayer1 = nn.Conv2d(256, 512, kernel_size=1, stride=1, padding=0) | |
| self.latlayer2 = nn.Conv2d(128, 512, kernel_size=1, stride=1, padding=0) | |
| def _upsample_add(self, x, y): | |
| '''Upsample and add two feature maps. | |
| Args: | |
| x: (Variable) top feature map to be upsampled. | |
| y: (Variable) lateral feature map. | |
| Returns: | |
| (Variable) added feature map. | |
| Note in PyTorch, when input size is odd, the upsampled feature map | |
| with `F.upsample(..., scale_factor=2, mode='nearest')` | |
| maybe not equal to the lateral feature map size. | |
| e.g. | |
| original input size: [N,_,15,15] -> | |
| conv2d feature map size: [N,_,8,8] -> | |
| upsampled feature map size: [N,_,16,16] | |
| So we choose bilinear upsample which supports arbitrary output sizes. | |
| ''' | |
| _, _, H, W = y.size() | |
| return F.interpolate(x, size=(H, W), mode='bilinear', align_corners=True) + y | |
| def forward(self, x): | |
| x = self.input_layer(x) | |
| latents = [] | |
| modulelist = list(self.body._modules.values()) | |
| for i, l in enumerate(modulelist): | |
| x = l(x) | |
| if i == 6: | |
| c1 = x | |
| elif i == 20: | |
| c2 = x | |
| elif i == 23: | |
| c3 = x | |
| for j in range(self.coarse_ind): | |
| latents.append(self.styles[j](c3)) | |
| p2 = self._upsample_add(c3, self.latlayer1(c2)) | |
| for j in range(self.coarse_ind, self.middle_ind): | |
| latents.append(self.styles[j](p2)) | |
| p1 = self._upsample_add(p2, self.latlayer2(c1)) | |
| for j in range(self.middle_ind, self.style_count): | |
| latents.append(self.styles[j](p1)) | |
| out = torch.stack(latents, dim=1) | |
| return out | |
| class BackboneEncoderUsingLastLayerIntoW(Module): | |
| def __init__(self, num_layers, mode='ir', opts=None): | |
| super(BackboneEncoderUsingLastLayerIntoW, self).__init__() | |
| print('Using BackboneEncoderUsingLastLayerIntoW') | |
| assert num_layers in [50, 100, 152], 'num_layers should be 50,100, or 152' | |
| assert mode in ['ir', 'ir_se'], 'mode should be ir or ir_se' | |
| blocks = get_blocks(num_layers) | |
| if mode == 'ir': | |
| unit_module = bottleneck_IR | |
| elif mode == 'ir_se': | |
| unit_module = bottleneck_IR_SE | |
| self.input_layer = Sequential(Conv2d(opts.input_nc, 64, (3, 3), 1, 1, bias=False), | |
| BatchNorm2d(64), | |
| PReLU(64)) | |
| self.output_pool = torch.nn.AdaptiveAvgPool2d((1, 1)) | |
| self.linear = EqualLinear(512, 512, lr_mul=1) | |
| modules = [] | |
| for block in blocks: | |
| for bottleneck in block: | |
| modules.append(unit_module(bottleneck.in_channel, | |
| bottleneck.depth, | |
| bottleneck.stride)) | |
| self.body = Sequential(*modules) | |
| def forward(self, x): | |
| x = self.input_layer(x) | |
| x = self.body(x) | |
| x = self.output_pool(x) | |
| x = x.view(-1, 512) | |
| x = self.linear(x) | |
| return x | |
| class BackboneEncoderUsingLastLayerIntoWPlus(Module): | |
| def __init__(self, num_layers, mode='ir', opts=None): | |
| super(BackboneEncoderUsingLastLayerIntoWPlus, self).__init__() | |
| print('Using BackboneEncoderUsingLastLayerIntoWPlus') | |
| assert num_layers in [50, 100, 152], 'num_layers should be 50,100, or 152' | |
| assert mode in ['ir', 'ir_se'], 'mode should be ir or ir_se' | |
| blocks = get_blocks(num_layers) | |
| if mode == 'ir': | |
| unit_module = bottleneck_IR | |
| elif mode == 'ir_se': | |
| unit_module = bottleneck_IR_SE | |
| self.input_layer = Sequential(Conv2d(opts.input_nc, 64, (3, 3), 1, 1, bias=False), | |
| BatchNorm2d(64), | |
| PReLU(64)) | |
| self.output_layer_2 = Sequential(BatchNorm2d(512), | |
| torch.nn.AdaptiveAvgPool2d((7, 7)), | |
| Flatten(), | |
| Linear(512 * 7 * 7, 512)) | |
| self.linear = EqualLinear(512, 512 * 18, lr_mul=1) | |
| modules = [] | |
| for block in blocks: | |
| for bottleneck in block: | |
| modules.append(unit_module(bottleneck.in_channel, | |
| bottleneck.depth, | |
| bottleneck.stride)) | |
| self.body = Sequential(*modules) | |
| def forward(self, x): | |
| x = self.input_layer(x) | |
| x = self.body(x) | |
| x = self.output_layer_2(x) | |
| x = self.linear(x) | |
| x = x.view(-1, 18, 512) | |
| return x | |