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389 lines
14 KiB
389 lines
14 KiB
# pylint: skip-file |
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# type: ignore |
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import math |
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import random |
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import torch |
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from torch import nn |
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from .gfpganv1_arch import ResUpBlock |
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from .stylegan2_bilinear_arch import ( |
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ConvLayer, |
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EqualConv2d, |
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EqualLinear, |
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ResBlock, |
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ScaledLeakyReLU, |
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StyleGAN2GeneratorBilinear, |
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) |
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class StyleGAN2GeneratorBilinearSFT(StyleGAN2GeneratorBilinear): |
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"""StyleGAN2 Generator with SFT modulation (Spatial Feature Transform). |
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It is the bilinear version. It does not use the complicated UpFirDnSmooth function that is not friendly for |
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deployment. It can be easily converted to the clean version: StyleGAN2GeneratorCSFT. |
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Args: |
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out_size (int): The spatial size of outputs. |
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num_style_feat (int): Channel number of style features. Default: 512. |
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num_mlp (int): Layer number of MLP style layers. Default: 8. |
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channel_multiplier (int): Channel multiplier for large networks of StyleGAN2. Default: 2. |
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lr_mlp (float): Learning rate multiplier for mlp layers. Default: 0.01. |
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narrow (float): The narrow ratio for channels. Default: 1. |
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sft_half (bool): Whether to apply SFT on half of the input channels. Default: False. |
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""" |
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def __init__( |
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self, |
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out_size, |
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num_style_feat=512, |
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num_mlp=8, |
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channel_multiplier=2, |
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lr_mlp=0.01, |
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narrow=1, |
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sft_half=False, |
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): |
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super(StyleGAN2GeneratorBilinearSFT, self).__init__( |
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out_size, |
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num_style_feat=num_style_feat, |
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num_mlp=num_mlp, |
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channel_multiplier=channel_multiplier, |
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lr_mlp=lr_mlp, |
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narrow=narrow, |
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) |
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self.sft_half = sft_half |
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def forward( |
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self, |
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styles, |
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conditions, |
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input_is_latent=False, |
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noise=None, |
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randomize_noise=True, |
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truncation=1, |
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truncation_latent=None, |
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inject_index=None, |
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return_latents=False, |
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): |
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"""Forward function for StyleGAN2GeneratorBilinearSFT. |
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Args: |
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styles (list[Tensor]): Sample codes of styles. |
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conditions (list[Tensor]): SFT conditions to generators. |
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input_is_latent (bool): Whether input is latent style. Default: False. |
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noise (Tensor | None): Input noise or None. Default: None. |
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randomize_noise (bool): Randomize noise, used when 'noise' is False. Default: True. |
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truncation (float): The truncation ratio. Default: 1. |
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truncation_latent (Tensor | None): The truncation latent tensor. Default: None. |
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inject_index (int | None): The injection index for mixing noise. Default: None. |
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return_latents (bool): Whether to return style latents. Default: False. |
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""" |
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# style codes -> latents with Style MLP layer |
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if not input_is_latent: |
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styles = [self.style_mlp(s) for s in styles] |
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# noises |
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if noise is None: |
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if randomize_noise: |
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noise = [None] * self.num_layers # for each style conv layer |
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else: # use the stored noise |
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noise = [ |
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getattr(self.noises, f"noise{i}") for i in range(self.num_layers) |
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] |
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# style truncation |
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if truncation < 1: |
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style_truncation = [] |
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for style in styles: |
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style_truncation.append( |
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truncation_latent + truncation * (style - truncation_latent) |
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) |
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styles = style_truncation |
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# get style latents with injection |
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if len(styles) == 1: |
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inject_index = self.num_latent |
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if styles[0].ndim < 3: |
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# repeat latent code for all the layers |
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latent = styles[0].unsqueeze(1).repeat(1, inject_index, 1) |
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else: # used for encoder with different latent code for each layer |
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latent = styles[0] |
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elif len(styles) == 2: # mixing noises |
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if inject_index is None: |
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inject_index = random.randint(1, self.num_latent - 1) |
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latent1 = styles[0].unsqueeze(1).repeat(1, inject_index, 1) |
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latent2 = ( |
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styles[1].unsqueeze(1).repeat(1, self.num_latent - inject_index, 1) |
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) |
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latent = torch.cat([latent1, latent2], 1) |
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|
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# main generation |
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out = self.constant_input(latent.shape[0]) |
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out = self.style_conv1(out, latent[:, 0], noise=noise[0]) |
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skip = self.to_rgb1(out, latent[:, 1]) |
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i = 1 |
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for conv1, conv2, noise1, noise2, to_rgb in zip( |
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self.style_convs[::2], |
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self.style_convs[1::2], |
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noise[1::2], |
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noise[2::2], |
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self.to_rgbs, |
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): |
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out = conv1(out, latent[:, i], noise=noise1) |
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# the conditions may have fewer levels |
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if i < len(conditions): |
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# SFT part to combine the conditions |
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if self.sft_half: # only apply SFT to half of the channels |
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out_same, out_sft = torch.split(out, int(out.size(1) // 2), dim=1) |
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out_sft = out_sft * conditions[i - 1] + conditions[i] |
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out = torch.cat([out_same, out_sft], dim=1) |
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else: # apply SFT to all the channels |
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out = out * conditions[i - 1] + conditions[i] |
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out = conv2(out, latent[:, i + 1], noise=noise2) |
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skip = to_rgb(out, latent[:, i + 2], skip) # feature back to the rgb space |
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i += 2 |
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image = skip |
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if return_latents: |
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return image, latent |
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else: |
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return image, None |
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class GFPGANBilinear(nn.Module): |
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"""The GFPGAN architecture: Unet + StyleGAN2 decoder with SFT. |
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It is the bilinear version and it does not use the complicated UpFirDnSmooth function that is not friendly for |
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deployment. It can be easily converted to the clean version: GFPGANv1Clean. |
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Ref: GFP-GAN: Towards Real-World Blind Face Restoration with Generative Facial Prior. |
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Args: |
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out_size (int): The spatial size of outputs. |
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num_style_feat (int): Channel number of style features. Default: 512. |
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channel_multiplier (int): Channel multiplier for large networks of StyleGAN2. Default: 2. |
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decoder_load_path (str): The path to the pre-trained decoder model (usually, the StyleGAN2). Default: None. |
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fix_decoder (bool): Whether to fix the decoder. Default: True. |
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num_mlp (int): Layer number of MLP style layers. Default: 8. |
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lr_mlp (float): Learning rate multiplier for mlp layers. Default: 0.01. |
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input_is_latent (bool): Whether input is latent style. Default: False. |
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different_w (bool): Whether to use different latent w for different layers. Default: False. |
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narrow (float): The narrow ratio for channels. Default: 1. |
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sft_half (bool): Whether to apply SFT on half of the input channels. Default: False. |
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""" |
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def __init__( |
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self, |
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out_size, |
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num_style_feat=512, |
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channel_multiplier=1, |
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decoder_load_path=None, |
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fix_decoder=True, |
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# for stylegan decoder |
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num_mlp=8, |
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lr_mlp=0.01, |
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input_is_latent=False, |
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different_w=False, |
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narrow=1, |
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sft_half=False, |
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): |
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super(GFPGANBilinear, self).__init__() |
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self.input_is_latent = input_is_latent |
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self.different_w = different_w |
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self.num_style_feat = num_style_feat |
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self.min_size_restriction = 512 |
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unet_narrow = narrow * 0.5 # by default, use a half of input channels |
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channels = { |
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"4": int(512 * unet_narrow), |
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"8": int(512 * unet_narrow), |
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"16": int(512 * unet_narrow), |
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"32": int(512 * unet_narrow), |
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"64": int(256 * channel_multiplier * unet_narrow), |
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"128": int(128 * channel_multiplier * unet_narrow), |
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"256": int(64 * channel_multiplier * unet_narrow), |
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"512": int(32 * channel_multiplier * unet_narrow), |
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"1024": int(16 * channel_multiplier * unet_narrow), |
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} |
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self.log_size = int(math.log(out_size, 2)) |
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first_out_size = 2 ** (int(math.log(out_size, 2))) |
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self.conv_body_first = ConvLayer( |
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3, channels[f"{first_out_size}"], 1, bias=True, activate=True |
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) |
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# downsample |
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in_channels = channels[f"{first_out_size}"] |
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self.conv_body_down = nn.ModuleList() |
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for i in range(self.log_size, 2, -1): |
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out_channels = channels[f"{2**(i - 1)}"] |
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self.conv_body_down.append(ResBlock(in_channels, out_channels)) |
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in_channels = out_channels |
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self.final_conv = ConvLayer( |
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in_channels, channels["4"], 3, bias=True, activate=True |
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) |
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# upsample |
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in_channels = channels["4"] |
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self.conv_body_up = nn.ModuleList() |
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for i in range(3, self.log_size + 1): |
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out_channels = channels[f"{2**i}"] |
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self.conv_body_up.append(ResUpBlock(in_channels, out_channels)) |
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in_channels = out_channels |
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# to RGB |
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self.toRGB = nn.ModuleList() |
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for i in range(3, self.log_size + 1): |
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self.toRGB.append( |
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EqualConv2d( |
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channels[f"{2**i}"], |
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3, |
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1, |
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stride=1, |
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padding=0, |
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bias=True, |
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bias_init_val=0, |
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) |
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) |
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if different_w: |
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linear_out_channel = (int(math.log(out_size, 2)) * 2 - 2) * num_style_feat |
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else: |
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linear_out_channel = num_style_feat |
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self.final_linear = EqualLinear( |
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channels["4"] * 4 * 4, |
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linear_out_channel, |
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bias=True, |
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bias_init_val=0, |
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lr_mul=1, |
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activation=None, |
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) |
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# the decoder: stylegan2 generator with SFT modulations |
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self.stylegan_decoder = StyleGAN2GeneratorBilinearSFT( |
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out_size=out_size, |
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num_style_feat=num_style_feat, |
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num_mlp=num_mlp, |
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channel_multiplier=channel_multiplier, |
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lr_mlp=lr_mlp, |
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narrow=narrow, |
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sft_half=sft_half, |
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) |
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# load pre-trained stylegan2 model if necessary |
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if decoder_load_path: |
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self.stylegan_decoder.load_state_dict( |
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torch.load( |
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decoder_load_path, map_location=lambda storage, loc: storage |
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)["params_ema"] |
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) |
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# fix decoder without updating params |
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if fix_decoder: |
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for _, param in self.stylegan_decoder.named_parameters(): |
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param.requires_grad = False |
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# for SFT modulations (scale and shift) |
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self.condition_scale = nn.ModuleList() |
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self.condition_shift = nn.ModuleList() |
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for i in range(3, self.log_size + 1): |
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out_channels = channels[f"{2**i}"] |
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if sft_half: |
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sft_out_channels = out_channels |
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else: |
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sft_out_channels = out_channels * 2 |
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self.condition_scale.append( |
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nn.Sequential( |
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EqualConv2d( |
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out_channels, |
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out_channels, |
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3, |
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stride=1, |
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padding=1, |
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bias=True, |
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bias_init_val=0, |
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), |
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ScaledLeakyReLU(0.2), |
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EqualConv2d( |
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out_channels, |
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sft_out_channels, |
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3, |
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stride=1, |
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padding=1, |
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bias=True, |
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bias_init_val=1, |
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), |
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) |
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) |
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self.condition_shift.append( |
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nn.Sequential( |
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EqualConv2d( |
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out_channels, |
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out_channels, |
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3, |
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stride=1, |
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padding=1, |
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bias=True, |
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bias_init_val=0, |
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), |
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ScaledLeakyReLU(0.2), |
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EqualConv2d( |
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out_channels, |
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sft_out_channels, |
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3, |
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stride=1, |
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padding=1, |
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bias=True, |
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bias_init_val=0, |
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), |
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) |
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) |
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def forward(self, x, return_latents=False, return_rgb=True, randomize_noise=True): |
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"""Forward function for GFPGANBilinear. |
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Args: |
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x (Tensor): Input images. |
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return_latents (bool): Whether to return style latents. Default: False. |
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return_rgb (bool): Whether return intermediate rgb images. Default: True. |
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randomize_noise (bool): Randomize noise, used when 'noise' is False. Default: True. |
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""" |
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conditions = [] |
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unet_skips = [] |
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out_rgbs = [] |
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# encoder |
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feat = self.conv_body_first(x) |
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for i in range(self.log_size - 2): |
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feat = self.conv_body_down[i](feat) |
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unet_skips.insert(0, feat) |
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feat = self.final_conv(feat) |
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# style code |
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style_code = self.final_linear(feat.view(feat.size(0), -1)) |
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if self.different_w: |
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style_code = style_code.view(style_code.size(0), -1, self.num_style_feat) |
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# decode |
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for i in range(self.log_size - 2): |
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# add unet skip |
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feat = feat + unet_skips[i] |
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# ResUpLayer |
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feat = self.conv_body_up[i](feat) |
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# generate scale and shift for SFT layers |
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scale = self.condition_scale[i](feat) |
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conditions.append(scale.clone()) |
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shift = self.condition_shift[i](feat) |
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conditions.append(shift.clone()) |
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# generate rgb images |
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if return_rgb: |
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out_rgbs.append(self.toRGB[i](feat)) |
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# decoder |
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image, _ = self.stylegan_decoder( |
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[style_code], |
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conditions, |
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return_latents=return_latents, |
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input_is_latent=self.input_is_latent, |
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randomize_noise=randomize_noise, |
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) |
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return image, out_rgbs
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