README and Code

.gitignore

@@ -0,0 +1,115 @@
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+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
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+lib/
+lib64/
+parts/
+sdist/
+var/
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+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
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+
+# Installer logs
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+
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+.coverage.*
+.cache
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+
+# Translations
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+
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+
+.idea/

README.md

@@ -1,3 +1,23 @@
 ---
+tags:
+- unconditional-image-generation
 license: apache-2.0
 ---
+
+# Model info
+
+`fbanime.pkl`: StyleGan2 model trained with official [StyleGan3](https://github.com/NVlabs/stylegan3).
+But I modified the code (networks_stylegan2.py and dataset.py) to support non-square resolutions.
+
+`g_mapping.onnx`: onnx format mapping network of fbanime.pkl
+
+`g_synthesis.onnx`: onnx format synthesis network of fbanime.pkl
+
+`encoder.onnx`:  4e model trained with [encoder4editing-stylegan3](https://github.com/yj7082126/encoder4editing-stylegan3).
+I add support for official StyleGan2 model and change backbone to ResNet-34 in [restyle-encoder](https://github.com/yuval-alaluf/restyle-encoder).
+
+`waifu_dect.onnx` YOLOv5 model trained with official [YOLOv5](https://github.com/ultralytics/yolov5)
+
+# Usage
+
+see [demo](https://huggingface.co/spaces/skytnt/full-body-anime-gan/blob/main/app.py)

code/dataset.py

@@ -0,0 +1,238 @@
+# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+"""Streaming images and labels from datasets created with dataset_tool.py."""
+
+import os
+import numpy as np
+import zipfile
+import PIL.Image
+import json
+import torch
+import dnnlib
+
+try:
+    import pyspng
+except ImportError:
+    pyspng = None
+
+#----------------------------------------------------------------------------
+
+class Dataset(torch.utils.data.Dataset):
+    def __init__(self,
+        name,                   # Name of the dataset.
+        raw_shape,              # Shape of the raw image data (NCHW).
+        max_size    = None,     # Artificially limit the size of the dataset. None = no limit. Applied before xflip.
+        use_labels  = False,    # Enable conditioning labels? False = label dimension is zero.
+        xflip       = False,    # Artificially double the size of the dataset via x-flips. Applied after max_size.
+        random_seed = 0,        # Random seed to use when applying max_size.
+    ):
+        self._name = name
+        self._raw_shape = list(raw_shape)
+        self._use_labels = use_labels
+        self._raw_labels = None
+        self._label_shape = None
+
+        # Apply max_size.
+        self._raw_idx = np.arange(self._raw_shape[0], dtype=np.int64)
+        if (max_size is not None) and (self._raw_idx.size > max_size):
+            np.random.RandomState(random_seed).shuffle(self._raw_idx)
+            self._raw_idx = np.sort(self._raw_idx[:max_size])
+
+        # Apply xflip.
+        self._xflip = np.zeros(self._raw_idx.size, dtype=np.uint8)
+        if xflip:
+            self._raw_idx = np.tile(self._raw_idx, 2)
+            self._xflip = np.concatenate([self._xflip, np.ones_like(self._xflip)])
+
+    def _get_raw_labels(self):
+        if self._raw_labels is None:
+            self._raw_labels = self._load_raw_labels() if self._use_labels else None
+            if self._raw_labels is None:
+                self._raw_labels = np.zeros([self._raw_shape[0], 0], dtype=np.float32)
+            assert isinstance(self._raw_labels, np.ndarray)
+            assert self._raw_labels.shape[0] == self._raw_shape[0]
+            assert self._raw_labels.dtype in [np.float32, np.int64]
+            if self._raw_labels.dtype == np.int64:
+                assert self._raw_labels.ndim == 1
+                assert np.all(self._raw_labels >= 0)
+        return self._raw_labels
+
+    def close(self): # to be overridden by subclass
+        pass
+
+    def _load_raw_image(self, raw_idx): # to be overridden by subclass
+        raise NotImplementedError
+
+    def _load_raw_labels(self): # to be overridden by subclass
+        raise NotImplementedError
+
+    def __getstate__(self):
+        return dict(self.__dict__, _raw_labels=None)
+
+    def __del__(self):
+        try:
+            self.close()
+        except:
+            pass
+
+    def __len__(self):
+        return self._raw_idx.size
+
+    def __getitem__(self, idx):
+        image = self._load_raw_image(self._raw_idx[idx])
+        assert isinstance(image, np.ndarray)
+        assert list(image.shape) == self.image_shape
+        assert image.dtype == np.uint8
+        if self._xflip[idx]:
+            assert image.ndim == 3 # CHW
+            image = image[:, :, ::-1]
+        return image.copy(), self.get_label(idx)
+
+    def get_label(self, idx):
+        label = self._get_raw_labels()[self._raw_idx[idx]]
+        if label.dtype == np.int64:
+            onehot = np.zeros(self.label_shape, dtype=np.float32)
+            onehot[label] = 1
+            label = onehot
+        return label.copy()
+
+    def get_details(self, idx):
+        d = dnnlib.EasyDict()
+        d.raw_idx = int(self._raw_idx[idx])
+        d.xflip = (int(self._xflip[idx]) != 0)
+        d.raw_label = self._get_raw_labels()[d.raw_idx].copy()
+        return d
+
+    @property
+    def name(self):
+        return self._name
+
+    @property
+    def image_shape(self):
+        return list(self._raw_shape[1:])
+
+    @property
+    def num_channels(self):
+        assert len(self.image_shape) == 3 # CHW
+        return self.image_shape[0]
+
+    @property
+    def resolution(self):
+        assert len(self.image_shape) == 3 # CHW
+        # assert self.image_shape[1] == self.image_shape[2]
+        return self.image_shape[1], self.image_shape[2]
+
+    @property
+    def label_shape(self):
+        if self._label_shape is None:
+            raw_labels = self._get_raw_labels()
+            if raw_labels.dtype == np.int64:
+                self._label_shape = [int(np.max(raw_labels)) + 1]
+            else:
+                self._label_shape = raw_labels.shape[1:]
+        return list(self._label_shape)
+
+    @property
+    def label_dim(self):
+        assert len(self.label_shape) == 1
+        return self.label_shape[0]
+
+    @property
+    def has_labels(self):
+        return any(x != 0 for x in self.label_shape)
+
+    @property
+    def has_onehot_labels(self):
+        return self._get_raw_labels().dtype == np.int64
+
+#----------------------------------------------------------------------------
+
+class ImageFolderDataset(Dataset):
+    def __init__(self,
+        path,                   # Path to directory or zip.
+        resolution      = None, # Ensure specific resolution, None = highest available.
+        **super_kwargs,         # Additional arguments for the Dataset base class.
+    ):
+        self._path = path
+        self._zipfile = None
+
+        if os.path.isdir(self._path):
+            self._type = 'dir'
+            self._all_fnames = {os.path.relpath(os.path.join(root, fname), start=self._path) for root, _dirs, files in os.walk(self._path) for fname in files}
+        elif self._file_ext(self._path) == '.zip':
+            self._type = 'zip'
+            self._all_fnames = set(self._get_zipfile().namelist())
+        else:
+            raise IOError('Path must point to a directory or zip')
+
+        PIL.Image.init()
+        self._image_fnames = sorted(fname for fname in self._all_fnames if self._file_ext(fname) in PIL.Image.EXTENSION)
+        if len(self._image_fnames) == 0:
+            raise IOError('No image files found in the specified path')
+
+        name = os.path.splitext(os.path.basename(self._path))[0]
+        raw_shape = [len(self._image_fnames)] + list(self._load_raw_image(0).shape)
+        if resolution is not None and (raw_shape[2] != resolution[0] or raw_shape[3] != resolution[1]):
+            raise IOError('Image files do not match the specified resolution')
+        super().__init__(name=name, raw_shape=raw_shape, **super_kwargs)
+
+    @staticmethod
+    def _file_ext(fname):
+        return os.path.splitext(fname)[1].lower()
+
+    def _get_zipfile(self):
+        assert self._type == 'zip'
+        if self._zipfile is None:
+            self._zipfile = zipfile.ZipFile(self._path)
+        return self._zipfile
+
+    def _open_file(self, fname):
+        if self._type == 'dir':
+            return open(os.path.join(self._path, fname), 'rb')
+        if self._type == 'zip':
+            return self._get_zipfile().open(fname, 'r')
+        return None
+
+    def close(self):
+        try:
+            if self._zipfile is not None:
+                self._zipfile.close()
+        finally:
+            self._zipfile = None
+
+    def __getstate__(self):
+        return dict(super().__getstate__(), _zipfile=None)
+
+    def _load_raw_image(self, raw_idx):
+        fname = self._image_fnames[raw_idx]
+        with self._open_file(fname) as f:
+            if pyspng is not None and self._file_ext(fname) == '.png':
+                image = pyspng.load(f.read())
+            else:
+                image = np.array(PIL.Image.open(f))
+        if image.ndim == 2:
+            image = image[:, :, np.newaxis] # HW => HWC
+        image = image.transpose(2, 0, 1) # HWC => CHW
+        return image
+
+    def _load_raw_labels(self):
+        fname = 'dataset.json'
+        if fname not in self._all_fnames:
+            return None
+        with self._open_file(fname) as f:
+            labels = json.load(f)['labels']
+        if labels is None:
+            return None
+        labels = dict(labels)
+        labels = [labels[fname.replace('\\', '/')] for fname in self._image_fnames]
+        labels = np.array(labels)
+        labels = labels.astype({1: np.int64, 2: np.float32}[labels.ndim])
+        return labels
+
+#----------------------------------------------------------------------------

code/networks_stylegan2.py

@@ -0,0 +1,842 @@
+# Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+# NVIDIA CORPORATION and its licensors retain all intellectual property
+# and proprietary rights in and to this software, related documentation
+# and any modifications thereto.  Any use, reproduction, disclosure or
+# distribution of this software and related documentation without an express
+# license agreement from NVIDIA CORPORATION is strictly prohibited.
+
+"""Network architectures from the paper
+"Analyzing and Improving the Image Quality of StyleGAN".
+Matches the original implementation of configs E-F by Karras et al. at
+https://github.com/NVlabs/stylegan2/blob/master/training/networks_stylegan2.py"""
+
+import numpy as np
+import torch
+from torch_utils import misc
+from torch_utils import persistence
+from torch_utils.ops import conv2d_resample
+from torch_utils.ops import upfirdn2d
+from torch_utils.ops import bias_act
+from torch_utils.ops import fma
+
+
+# ----------------------------------------------------------------------------
+
+@misc.profiled_function
+def normalize_2nd_moment(x, dim=1, eps=1e-8):
+    return x * (x.square().mean(dim=dim, keepdim=True) + eps).rsqrt()
+
+
+# ----------------------------------------------------------------------------
+
+@misc.profiled_function
+def modulated_conv2d(
+        x,  # Input tensor of shape [batch_size, in_channels, in_height, in_width].
+        weight,  # Weight tensor of shape [out_channels, in_channels, kernel_height, kernel_width].
+        styles,  # Modulation coefficients of shape [batch_size, in_channels].
+        noise=None,  # Optional noise tensor to add to the output activations.
+        up=1,  # Integer upsampling factor.
+        down=1,  # Integer downsampling factor.
+        padding=0,  # Padding with respect to the upsampled image.
+        resample_filter=None,
+        # Low-pass filter to apply when resampling activations. Must be prepared beforehand by calling upfirdn2d.setup_filter().
+        demodulate=True,  # Apply weight demodulation?
+        flip_weight=True,  # False = convolution, True = correlation (matches torch.nn.functional.conv2d).
+        fused_modconv=True,  # Perform modulation, convolution, and demodulation as a single fused operation?
+):
+    batch_size = x.shape[0]
+    out_channels, in_channels, kh, kw = weight.shape
+    misc.assert_shape(weight, [out_channels, in_channels, kh, kw])  # [OIkk]
+    misc.assert_shape(x, [batch_size, in_channels, None, None])  # [NIHW]
+    misc.assert_shape(styles, [batch_size, in_channels])  # [NI]
+
+    # Pre-normalize inputs to avoid FP16 overflow.
+    if x.dtype == torch.float16 and demodulate:
+        weight = weight * (1 / np.sqrt(in_channels * kh * kw) / weight.norm(float('inf'), dim=[1, 2, 3],
+                                                                            keepdim=True))  # max_Ikk
+        styles = styles / styles.norm(float('inf'), dim=1, keepdim=True)  # max_I
+
+    # Calculate per-sample weights and demodulation coefficients.
+    w = None
+    dcoefs = None
+    if demodulate or fused_modconv:
+        w = weight.unsqueeze(0)  # [NOIkk]
+        w = w * styles.reshape(batch_size, 1, -1, 1, 1)  # [NOIkk]
+    if demodulate:
+        dcoefs = (w.square().sum(dim=[2, 3, 4]) + 1e-8).rsqrt()  # [NO]
+    if demodulate and fused_modconv:
+        w = w * dcoefs.reshape(batch_size, -1, 1, 1, 1)  # [NOIkk]
+
+    # Execute by scaling the activations before and after the convolution.
+    if not fused_modconv:
+        x = x * styles.to(x.dtype).reshape(batch_size, -1, 1, 1)
+        x = conv2d_resample.conv2d_resample(x=x, w=weight.to(x.dtype), f=resample_filter, up=up, down=down,
+                                            padding=padding, flip_weight=flip_weight)
+        if demodulate and noise is not None:
+            x = fma.fma(x, dcoefs.to(x.dtype).reshape(batch_size, -1, 1, 1), noise.to(x.dtype))
+        elif demodulate:
+            x = x * dcoefs.to(x.dtype).reshape(batch_size, -1, 1, 1)
+        elif noise is not None:
+            x = x.add_(noise.to(x.dtype))
+        return x
+
+    # Execute as one fused op using grouped convolution.
+    with misc.suppress_tracer_warnings():  # this value will be treated as a constant
+        batch_size = int(batch_size)
+    misc.assert_shape(x, [batch_size, in_channels, None, None])
+    x = x.reshape(1, -1, *x.shape[2:])
+    w = w.reshape(-1, in_channels, kh, kw)
+    x = conv2d_resample.conv2d_resample(x=x, w=w.to(x.dtype), f=resample_filter, up=up, down=down, padding=padding,
+                                        groups=batch_size, flip_weight=flip_weight)
+    x = x.reshape(batch_size, -1, *x.shape[2:])
+    if noise is not None:
+        x = x.add_(noise)
+    return x
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class FullyConnectedLayer(torch.nn.Module):
+    def __init__(self,
+                 in_features,  # Number of input features.
+                 out_features,  # Number of output features.
+                 bias=True,  # Apply additive bias before the activation function?
+                 activation='linear',  # Activation function: 'relu', 'lrelu', etc.
+                 lr_multiplier=1,  # Learning rate multiplier.
+                 bias_init=0,  # Initial value for the additive bias.
+                 ):
+        super().__init__()
+        self.in_features = in_features
+        self.out_features = out_features
+        self.activation = activation
+        self.weight = torch.nn.Parameter(torch.randn([out_features, in_features]) / lr_multiplier)
+        self.bias = torch.nn.Parameter(torch.full([out_features], np.float32(bias_init))) if bias else None
+        self.weight_gain = lr_multiplier / np.sqrt(in_features)
+        self.bias_gain = lr_multiplier
+
+    def forward(self, x):
+        w = self.weight.to(x.dtype) * self.weight_gain
+        b = self.bias
+        if b is not None:
+            b = b.to(x.dtype)
+            if self.bias_gain != 1:
+                b = b * self.bias_gain
+
+        if self.activation == 'linear' and b is not None:
+            x = torch.addmm(b.unsqueeze(0), x, w.t())
+        else:
+            x = x.matmul(w.t())
+            x = bias_act.bias_act(x, b, act=self.activation)
+        return x
+
+    def extra_repr(self):
+        return f'in_features={self.in_features:d}, out_features={self.out_features:d}, activation={self.activation:s}'
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class Conv2dLayer(torch.nn.Module):
+    def __init__(self,
+                 in_channels,  # Number of input channels.
+                 out_channels,  # Number of output channels.
+                 kernel_size,  # Width and height of the convolution kernel.
+                 bias=True,  # Apply additive bias before the activation function?
+                 activation='linear',  # Activation function: 'relu', 'lrelu', etc.
+                 up=1,  # Integer upsampling factor.
+                 down=1,  # Integer downsampling factor.
+                 resample_filter=[1, 3, 3, 1],  # Low-pass filter to apply when resampling activations.
+                 conv_clamp=None,  # Clamp the output to +-X, None = disable clamping.
+                 channels_last=False,  # Expect the input to have memory_format=channels_last?
+                 trainable=True,  # Update the weights of this layer during training?
+                 ):
+        super().__init__()
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        self.activation = activation
+        self.up = up
+        self.down = down
+        self.conv_clamp = conv_clamp
+        self.register_buffer('resample_filter', upfirdn2d.setup_filter(resample_filter))
+        self.padding = kernel_size // 2
+        self.weight_gain = 1 / np.sqrt(in_channels * (kernel_size ** 2))
+        self.act_gain = bias_act.activation_funcs[activation].def_gain
+
+        memory_format = torch.channels_last if channels_last else torch.contiguous_format
+        weight = torch.randn([out_channels, in_channels, kernel_size, kernel_size]).to(memory_format=memory_format)
+        bias = torch.zeros([out_channels]) if bias else None
+        if trainable:
+            self.weight = torch.nn.Parameter(weight)
+            self.bias = torch.nn.Parameter(bias) if bias is not None else None
+        else:
+            self.register_buffer('weight', weight)
+            if bias is not None:
+                self.register_buffer('bias', bias)
+            else:
+                self.bias = None
+
+    def forward(self, x, gain=1):
+        w = self.weight * self.weight_gain
+        b = self.bias.to(x.dtype) if self.bias is not None else None
+        flip_weight = (self.up == 1)  # slightly faster
+        x = conv2d_resample.conv2d_resample(x=x, w=w.to(x.dtype), f=self.resample_filter, up=self.up, down=self.down,
+                                            padding=self.padding, flip_weight=flip_weight)
+
+        act_gain = self.act_gain * gain
+        act_clamp = self.conv_clamp * gain if self.conv_clamp is not None else None
+        x = bias_act.bias_act(x, b, act=self.activation, gain=act_gain, clamp=act_clamp)
+        return x
+
+    def extra_repr(self):
+        return ' '.join([
+            f'in_channels={self.in_channels:d}, out_channels={self.out_channels:d}, activation={self.activation:s},',
+            f'up={self.up}, down={self.down}'])
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class MappingNetwork(torch.nn.Module):
+    def __init__(self,
+                 z_dim,  # Input latent (Z) dimensionality, 0 = no latent.
+                 c_dim,  # Conditioning label (C) dimensionality, 0 = no label.
+                 w_dim,  # Intermediate latent (W) dimensionality.
+                 num_ws,  # Number of intermediate latents to output, None = do not broadcast.
+                 num_layers=8,  # Number of mapping layers.
+                 embed_features=None,  # Label embedding dimensionality, None = same as w_dim.
+                 layer_features=None,  # Number of intermediate features in the mapping layers, None = same as w_dim.
+                 activation='lrelu',  # Activation function: 'relu', 'lrelu', etc.
+                 lr_multiplier=0.01,  # Learning rate multiplier for the mapping layers.
+                 w_avg_beta=0.998,  # Decay for tracking the moving average of W during training, None = do not track.
+                 ):
+        super().__init__()
+        self.z_dim = z_dim
+        self.c_dim = c_dim
+        self.w_dim = w_dim
+        self.num_ws = num_ws
+        self.num_layers = num_layers
+        self.w_avg_beta = w_avg_beta
+
+        if embed_features is None:
+            embed_features = w_dim
+        if c_dim == 0:
+            embed_features = 0
+        if layer_features is None:
+            layer_features = w_dim
+        features_list = [z_dim + embed_features] + [layer_features] * (num_layers - 1) + [w_dim]
+
+        if c_dim > 0:
+            self.embed = FullyConnectedLayer(c_dim, embed_features)
+        for idx in range(num_layers):
+            in_features = features_list[idx]
+            out_features = features_list[idx + 1]
+            layer = FullyConnectedLayer(in_features, out_features, activation=activation, lr_multiplier=lr_multiplier)
+            setattr(self, f'fc{idx}', layer)
+
+        if num_ws is not None and w_avg_beta is not None:
+            self.register_buffer('w_avg', torch.zeros([w_dim]))
+
+    def forward(self, z, c, truncation_psi=1, truncation_cutoff=None, update_emas=False):
+        # Embed, normalize, and concat inputs.
+        x = None
+        with torch.autograd.profiler.record_function('input'):
+            if self.z_dim > 0:
+                misc.assert_shape(z, [None, self.z_dim])
+                x = normalize_2nd_moment(z.to(torch.float32))
+            if self.c_dim > 0:
+                misc.assert_shape(c, [None, self.c_dim])
+                y = normalize_2nd_moment(self.embed(c.to(torch.float32)))
+                x = torch.cat([x, y], dim=1) if x is not None else y
+
+        # Main layers.
+        for idx in range(self.num_layers):
+            layer = getattr(self, f'fc{idx}')
+            x = layer(x)
+
+        # Update moving average of W.
+        if update_emas and self.w_avg_beta is not None:
+            with torch.autograd.profiler.record_function('update_w_avg'):
+                self.w_avg.copy_(x.detach().mean(dim=0).lerp(self.w_avg, self.w_avg_beta))
+
+        # Broadcast.
+        if self.num_ws is not None:
+            with torch.autograd.profiler.record_function('broadcast'):
+                x = x.unsqueeze(1).repeat([1, self.num_ws, 1])
+
+        # Apply truncation.
+        if truncation_psi != 1:
+            with torch.autograd.profiler.record_function('truncate'):
+                assert self.w_avg_beta is not None
+                if self.num_ws is None or truncation_cutoff is None:
+                    x = self.w_avg.lerp(x, truncation_psi)
+                else:
+                    x[:, :truncation_cutoff] = self.w_avg.lerp(x[:, :truncation_cutoff], truncation_psi)
+        return x
+
+    def extra_repr(self):
+        return f'z_dim={self.z_dim:d}, c_dim={self.c_dim:d}, w_dim={self.w_dim:d}, num_ws={self.num_ws:d}'
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class SynthesisLayer(torch.nn.Module):
+    def __init__(self,
+                 in_channels,  # Number of input channels.
+                 out_channels,  # Number of output channels.
+                 w_dim,  # Intermediate latent (W) dimensionality.
+                 resolution,  # Resolution of this layer.
+                 kernel_size=3,  # Convolution kernel size.
+                 up=1,  # Integer upsampling factor.
+                 use_noise=True,  # Enable noise input?
+                 activation='lrelu',  # Activation function: 'relu', 'lrelu', etc.
+                 resample_filter=[1, 3, 3, 1],  # Low-pass filter to apply when resampling activations.
+                 conv_clamp=None,  # Clamp the output of convolution layers to +-X, None = disable clamping.
+                 channels_last=False,  # Use channels_last format for the weights?
+                 ):
+        super().__init__()
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        self.w_dim = w_dim
+        self.resolution = resolution
+        self.up = up
+        self.use_noise = use_noise
+        self.activation = activation
+        self.conv_clamp = conv_clamp
+        self.register_buffer('resample_filter', upfirdn2d.setup_filter(resample_filter))
+        self.padding = kernel_size // 2
+        self.act_gain = bias_act.activation_funcs[activation].def_gain
+
+        self.affine = FullyConnectedLayer(w_dim, in_channels, bias_init=1)
+        memory_format = torch.channels_last if channels_last else torch.contiguous_format
+        self.weight = torch.nn.Parameter(
+            torch.randn([out_channels, in_channels, kernel_size, kernel_size]).to(memory_format=memory_format))
+        if use_noise:
+            self.register_buffer('noise_const', torch.randn([resolution[0], resolution[1]]))
+            self.noise_strength = torch.nn.Parameter(torch.zeros([]))
+        self.bias = torch.nn.Parameter(torch.zeros([out_channels]))
+
+    def forward(self, x, w, noise_mode='random', fused_modconv=True, gain=1):
+        assert noise_mode in ['random', 'const', 'none']
+        in_resolution = (self.resolution[0] // self.up, self.resolution[1] // self.up)
+        misc.assert_shape(x, [None, self.in_channels, in_resolution[0], in_resolution[1]])
+        styles = self.affine(w)
+
+        noise = None
+        if self.use_noise and noise_mode == 'random':
+            noise = torch.randn([x.shape[0], 1, self.resolution[0], self.resolution[1]],
+                                device=x.device) * self.noise_strength
+        if self.use_noise and noise_mode == 'const':
+            noise = self.noise_const * self.noise_strength
+
+        flip_weight = (self.up == 1)  # slightly faster
+        x = modulated_conv2d(x=x, weight=self.weight, styles=styles, noise=noise, up=self.up,
+                             padding=self.padding, resample_filter=self.resample_filter, flip_weight=flip_weight,
+                             fused_modconv=fused_modconv)
+
+        act_gain = self.act_gain * gain
+        act_clamp = self.conv_clamp * gain if self.conv_clamp is not None else None
+        x = bias_act.bias_act(x, self.bias.to(x.dtype), act=self.activation, gain=act_gain, clamp=act_clamp)
+        return x
+
+    def extra_repr(self):
+        return ' '.join([
+            f'in_channels={self.in_channels:d}, out_channels={self.out_channels:d}, w_dim={self.w_dim:d},',
+            f'resolution={self.resolution[0]:d}x{self.resolution[1]:d}, up={self.up}, activation={self.activation:s}'])
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class ToRGBLayer(torch.nn.Module):
+    def __init__(self, in_channels, out_channels, w_dim, kernel_size=1, conv_clamp=None, channels_last=False):
+        super().__init__()
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        self.w_dim = w_dim
+        self.conv_clamp = conv_clamp
+        self.affine = FullyConnectedLayer(w_dim, in_channels, bias_init=1)
+        memory_format = torch.channels_last if channels_last else torch.contiguous_format
+        self.weight = torch.nn.Parameter(
+            torch.randn([out_channels, in_channels, kernel_size, kernel_size]).to(memory_format=memory_format))
+        self.bias = torch.nn.Parameter(torch.zeros([out_channels]))
+        self.weight_gain = 1 / np.sqrt(in_channels * (kernel_size ** 2))
+
+    def forward(self, x, w, fused_modconv=True):
+        styles = self.affine(w) * self.weight_gain
+        x = modulated_conv2d(x=x, weight=self.weight, styles=styles, demodulate=False, fused_modconv=fused_modconv)
+        x = bias_act.bias_act(x, self.bias.to(x.dtype), clamp=self.conv_clamp)
+        return x
+
+    def extra_repr(self):
+        return f'in_channels={self.in_channels:d}, out_channels={self.out_channels:d}, w_dim={self.w_dim:d}'
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class SynthesisBlock(torch.nn.Module):
+    def __init__(self,
+                 in_channels,  # Number of input channels, 0 = first block.
+                 out_channels,  # Number of output channels.
+                 w_dim,  # Intermediate latent (W) dimensionality.
+                 resolution,  # Resolution of this block.
+                 img_channels,  # Number of output color channels.
+                 is_last,  # Is this the last block?
+                 architecture='skip',  # Architecture: 'orig', 'skip', 'resnet'.
+                 resample_filter=[1, 3, 3, 1],  # Low-pass filter to apply when resampling activations.
+                 conv_clamp=256,  # Clamp the output of convolution layers to +-X, None = disable clamping.
+                 use_fp16=False,  # Use FP16 for this block?
+                 fp16_channels_last=False,  # Use channels-last memory format with FP16?
+                 fused_modconv_default=True,
+                 # Default value of fused_modconv. 'inference_only' = True for inference, False for training.
+                 **layer_kwargs,  # Arguments for SynthesisLayer.
+                 ):
+        assert architecture in ['orig', 'skip', 'resnet']
+        super().__init__()
+        self.in_channels = in_channels
+        self.w_dim = w_dim
+        self.resolution = resolution
+        self.img_channels = img_channels
+        self.is_last = is_last
+        self.architecture = architecture
+        self.use_fp16 = use_fp16
+        self.channels_last = (use_fp16 and fp16_channels_last)
+        self.fused_modconv_default = fused_modconv_default
+        self.register_buffer('resample_filter', upfirdn2d.setup_filter(resample_filter))
+        self.num_conv = 0
+        self.num_torgb = 0
+
+        if in_channels == 0:
+            self.const = torch.nn.Parameter(torch.randn([out_channels, resolution[0], resolution[1]]))
+
+        if in_channels != 0:
+            self.conv0 = SynthesisLayer(in_channels, out_channels, w_dim=w_dim, resolution=resolution, up=2,
+                                        resample_filter=resample_filter, conv_clamp=conv_clamp,
+                                        channels_last=self.channels_last, **layer_kwargs)
+            self.num_conv += 1
+
+        self.conv1 = SynthesisLayer(out_channels, out_channels, w_dim=w_dim, resolution=resolution,
+                                    conv_clamp=conv_clamp, channels_last=self.channels_last, **layer_kwargs)
+        self.num_conv += 1
+
+        if is_last or architecture == 'skip':
+            self.torgb = ToRGBLayer(out_channels, img_channels, w_dim=w_dim,
+                                    conv_clamp=conv_clamp, channels_last=self.channels_last)
+            self.num_torgb += 1
+
+        if in_channels != 0 and architecture == 'resnet':
+            self.skip = Conv2dLayer(in_channels, out_channels, kernel_size=1, bias=False, up=2,
+                                    resample_filter=resample_filter, channels_last=self.channels_last)
+
+    def forward(self, x, img, ws, force_fp32=False, fused_modconv=None, update_emas=False, **layer_kwargs):
+        _ = update_emas  # unused
+        misc.assert_shape(ws, [None, self.num_conv + self.num_torgb, self.w_dim])
+        w_iter = iter(ws.unbind(dim=1))
+        if ws.device.type != 'cuda':
+            force_fp32 = True
+        dtype = torch.float16 if self.use_fp16 and not force_fp32 else torch.float32
+        memory_format = torch.channels_last if self.channels_last and not force_fp32 else torch.contiguous_format
+        if fused_modconv is None:
+            fused_modconv = self.fused_modconv_default
+        if fused_modconv == 'inference_only':
+            fused_modconv = (not self.training)
+
+        # Input.
+        if self.in_channels == 0:
+            x = self.const.to(dtype=dtype, memory_format=memory_format)
+            x = x.unsqueeze(0).repeat([ws.shape[0], 1, 1, 1])
+        else:
+            misc.assert_shape(x, [None, self.in_channels, self.resolution[0] // 2, self.resolution[1] // 2])
+            x = x.to(dtype=dtype, memory_format=memory_format)
+
+        # Main layers.
+        if self.in_channels == 0:
+            x = self.conv1(x, next(w_iter), fused_modconv=fused_modconv, **layer_kwargs)
+        elif self.architecture == 'resnet':
+            y = self.skip(x, gain=np.sqrt(0.5))
+            x = self.conv0(x, next(w_iter), fused_modconv=fused_modconv, **layer_kwargs)
+            x = self.conv1(x, next(w_iter), fused_modconv=fused_modconv, gain=np.sqrt(0.5), **layer_kwargs)
+            x = y.add_(x)
+        else:
+            x = self.conv0(x, next(w_iter), fused_modconv=fused_modconv, **layer_kwargs)
+            x = self.conv1(x, next(w_iter), fused_modconv=fused_modconv, **layer_kwargs)
+
+        # ToRGB.
+        if img is not None:
+            misc.assert_shape(img, [None, self.img_channels, self.resolution[0] // 2, self.resolution[1] // 2])
+            img = upfirdn2d.upsample2d(img, self.resample_filter)
+        if self.is_last or self.architecture == 'skip':
+            y = self.torgb(x, next(w_iter), fused_modconv=fused_modconv)
+            y = y.to(dtype=torch.float32, memory_format=torch.contiguous_format)
+            img = img.add_(y) if img is not None else y
+
+        assert x.dtype == dtype
+        assert img is None or img.dtype == torch.float32
+        return x, img
+
+    def extra_repr(self):
+        return f'resolution={self.resolution[0]:d}x{self.resolution[1]:d}, architecture={self.architecture:s}'
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class SynthesisNetwork(torch.nn.Module):
+    def __init__(self,
+                 w_dim,  # Intermediate latent (W) dimensionality.
+                 img_resolution,  # Output image resolution.
+                 img_channels,  # Number of color channels.
+                 channel_base=32768,  # Overall multiplier for the number of channels.
+                 channel_max=512,  # Maximum number of channels in any layer.
+                 num_fp16_res=4,  # Use FP16 for the N highest resolutions.
+                 **block_kwargs,  # Arguments for SynthesisBlock.
+                 ):
+        assert img_resolution[0] >= 4 and img_resolution[0] & (img_resolution[0] - 1) == 0
+        assert img_resolution[1] >= 4 and img_resolution[1] & (img_resolution[1] - 1) == 0
+        super().__init__()
+        self.w_dim = w_dim
+        self.img_resolution = img_resolution
+        self.img_resolution_log2 = int(np.log2(min(img_resolution)))
+        self.min_h = img_resolution[0] // min(img_resolution)
+        self.min_w = img_resolution[1] // min(img_resolution)
+        self.img_channels = img_channels
+        self.num_fp16_res = num_fp16_res
+        self.block_resolutions = [2 ** i for i in range(2, self.img_resolution_log2 + 1)]
+        channels_dict = {res: min(channel_base // res, channel_max) for res in self.block_resolutions}
+        fp16_resolution = max(2 ** (self.img_resolution_log2 + 1 - num_fp16_res), 8)
+
+        self.num_ws = 0
+        for res in self.block_resolutions:
+            in_channels = channels_dict[res // 2] if res > 4 else 0
+            out_channels = channels_dict[res]
+            use_fp16 = (res >= fp16_resolution)
+            is_last = (res == min(self.img_resolution))
+            block = SynthesisBlock(in_channels, out_channels, w_dim=w_dim,
+                                   resolution=(res * self.min_h, res * self.min_w),
+                                   img_channels=img_channels, is_last=is_last, use_fp16=use_fp16, **block_kwargs)
+            self.num_ws += block.num_conv
+            if is_last:
+                self.num_ws += block.num_torgb
+            setattr(self, f'b{res}', block)
+
+    def forward(self, ws, **block_kwargs):
+        block_ws = []
+        with torch.autograd.profiler.record_function('split_ws'):
+            misc.assert_shape(ws, [None, self.num_ws, self.w_dim])
+            ws = ws.to(torch.float32)
+            w_idx = 0
+            for res in self.block_resolutions:
+                block = getattr(self, f'b{res}')
+                block_ws.append(ws.narrow(1, w_idx, block.num_conv + block.num_torgb))
+                w_idx += block.num_conv
+
+        x = img = None
+        for res, cur_ws in zip(self.block_resolutions, block_ws):
+            block = getattr(self, f'b{res}')
+            x, img = block(x, img, cur_ws, **block_kwargs)
+        return img
+
+    def extra_repr(self):
+        return ' '.join([
+            f'w_dim={self.w_dim:d}, num_ws={self.num_ws:d},',
+            f'img_resolution={self.img_resolution[0]:d}x{self.img_resolution[1]:d},'
+            f'img_channels={self.img_channels:d},',
+            f'num_fp16_res={self.num_fp16_res:d}'])
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class Generator(torch.nn.Module):
+    def __init__(self,
+                 z_dim,  # Input latent (Z) dimensionality.
+                 c_dim,  # Conditioning label (C) dimensionality.
+                 w_dim,  # Intermediate latent (W) dimensionality.
+                 img_resolution,  # Output resolution.
+                 img_channels,  # Number of output color channels.
+                 mapping_kwargs={},  # Arguments for MappingNetwork.
+                 **synthesis_kwargs,  # Arguments for SynthesisNetwork.
+                 ):
+        super().__init__()
+        self.z_dim = z_dim
+        self.c_dim = c_dim
+        self.w_dim = w_dim
+        self.img_resolution = img_resolution
+        self.img_channels = img_channels
+        self.synthesis = SynthesisNetwork(w_dim=w_dim, img_resolution=img_resolution, img_channels=img_channels,
+                                          **synthesis_kwargs)
+        self.num_ws = self.synthesis.num_ws
+        self.mapping = MappingNetwork(z_dim=z_dim, c_dim=c_dim, w_dim=w_dim, num_ws=self.num_ws, **mapping_kwargs)
+
+    def forward(self, z, c, truncation_psi=1, truncation_cutoff=None, update_emas=False, **synthesis_kwargs):
+        ws = self.mapping(z, c, truncation_psi=truncation_psi, truncation_cutoff=truncation_cutoff,
+                          update_emas=update_emas)
+        img = self.synthesis(ws, update_emas=update_emas, **synthesis_kwargs)
+        return img
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class DiscriminatorBlock(torch.nn.Module):
+    def __init__(self,
+                 in_channels,  # Number of input channels, 0 = first block.
+                 tmp_channels,  # Number of intermediate channels.
+                 out_channels,  # Number of output channels.
+                 resolution,  # Resolution of this block.
+                 img_channels,  # Number of input color channels.
+                 first_layer_idx,  # Index of the first layer.
+                 architecture='resnet',  # Architecture: 'orig', 'skip', 'resnet'.
+                 activation='lrelu',  # Activation function: 'relu', 'lrelu', etc.
+                 resample_filter=[1, 3, 3, 1],  # Low-pass filter to apply when resampling activations.
+                 conv_clamp=None,  # Clamp the output of convolution layers to +-X, None = disable clamping.
+                 use_fp16=False,  # Use FP16 for this block?
+                 fp16_channels_last=False,  # Use channels-last memory format with FP16?
+                 freeze_layers=0,  # Freeze-D: Number of layers to freeze.
+                 ):
+        assert in_channels in [0, tmp_channels]
+        assert architecture in ['orig', 'skip', 'resnet']
+        super().__init__()
+        self.in_channels = in_channels
+        self.resolution = resolution
+        self.img_channels = img_channels
+        self.first_layer_idx = first_layer_idx
+        self.architecture = architecture
+        self.use_fp16 = use_fp16
+        self.channels_last = (use_fp16 and fp16_channels_last)
+        self.register_buffer('resample_filter', upfirdn2d.setup_filter(resample_filter))
+
+        self.num_layers = 0
+
+        def trainable_gen():
+            while True:
+                layer_idx = self.first_layer_idx + self.num_layers
+                trainable = (layer_idx >= freeze_layers)
+                self.num_layers += 1
+                yield trainable
+
+        trainable_iter = trainable_gen()
+
+        if in_channels == 0 or architecture == 'skip':
+            self.fromrgb = Conv2dLayer(img_channels, tmp_channels, kernel_size=1, activation=activation,
+                                       trainable=next(trainable_iter), conv_clamp=conv_clamp,
+                                       channels_last=self.channels_last)
+
+        self.conv0 = Conv2dLayer(tmp_channels, tmp_channels, kernel_size=3, activation=activation,
+                                 trainable=next(trainable_iter), conv_clamp=conv_clamp,
+                                 channels_last=self.channels_last)
+
+        self.conv1 = Conv2dLayer(tmp_channels, out_channels, kernel_size=3, activation=activation, down=2,
+                                 trainable=next(trainable_iter), resample_filter=resample_filter, conv_clamp=conv_clamp,
+                                 channels_last=self.channels_last)
+
+        if architecture == 'resnet':
+            self.skip = Conv2dLayer(tmp_channels, out_channels, kernel_size=1, bias=False, down=2,
+                                    trainable=next(trainable_iter), resample_filter=resample_filter,
+                                    channels_last=self.channels_last)
+
+    def forward(self, x, img, force_fp32=False):
+        if (x if x is not None else img).device.type != 'cuda':
+            force_fp32 = True
+        dtype = torch.float16 if self.use_fp16 and not force_fp32 else torch.float32
+        memory_format = torch.channels_last if self.channels_last and not force_fp32 else torch.contiguous_format
+
+        # Input.
+        if x is not None:
+            misc.assert_shape(x, [None, self.in_channels, self.resolution[0], self.resolution[1]])
+            x = x.to(dtype=dtype, memory_format=memory_format)
+
+        # FromRGB.
+        if self.in_channels == 0 or self.architecture == 'skip':
+            misc.assert_shape(img, [None, self.img_channels, self.resolution[0], self.resolution[1]])
+            img = img.to(dtype=dtype, memory_format=memory_format)
+            y = self.fromrgb(img)
+            x = x + y if x is not None else y
+            img = upfirdn2d.downsample2d(img, self.resample_filter) if self.architecture == 'skip' else None
+
+        # Main layers.
+        if self.architecture == 'resnet':
+            y = self.skip(x, gain=np.sqrt(0.5))
+            x = self.conv0(x)
+            x = self.conv1(x, gain=np.sqrt(0.5))
+            x = y.add_(x)
+        else:
+            x = self.conv0(x)
+            x = self.conv1(x)
+
+        assert x.dtype == dtype
+        return x, img
+
+    def extra_repr(self):
+        return f'resolution={self.resolution[0]:d}x{self.resolution[1]:d}, architecture={self.architecture:s}'
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class MinibatchStdLayer(torch.nn.Module):
+    def __init__(self, group_size, num_channels=1):
+        super().__init__()
+        self.group_size = group_size
+        self.num_channels = num_channels
+
+    def forward(self, x):
+        N, C, H, W = x.shape
+        with misc.suppress_tracer_warnings():  # as_tensor results are registered as constants
+            G = torch.min(torch.as_tensor(self.group_size), torch.as_tensor(N)) if self.group_size is not None else N
+        F = self.num_channels
+        c = C // F
+
+        y = x.reshape(G, -1, F, c, H,
+                      W)  # [GnFcHW] Split minibatch N into n groups of size G, and channels C into F groups of size c.
+        y = y - y.mean(dim=0)  # [GnFcHW] Subtract mean over group.
+        y = y.square().mean(dim=0)  # [nFcHW]  Calc variance over group.
+        y = (y + 1e-8).sqrt()  # [nFcHW]  Calc stddev over group.
+        y = y.mean(dim=[2, 3, 4])  # [nF]     Take average over channels and pixels.
+        y = y.reshape(-1, F, 1, 1)  # [nF11]   Add missing dimensions.
+        y = y.repeat(G, 1, H, W)  # [NFHW]   Replicate over group and pixels.
+        x = torch.cat([x, y], dim=1)  # [NCHW]   Append to input as new channels.
+        return x
+
+    def extra_repr(self):
+        return f'group_size={self.group_size}, num_channels={self.num_channels:d}'
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class DiscriminatorEpilogue(torch.nn.Module):
+    def __init__(self,
+                 in_channels,  # Number of input channels.
+                 cmap_dim,  # Dimensionality of mapped conditioning label, 0 = no label.
+                 resolution,  # Resolution of this block.
+                 img_channels,  # Number of input color channels.
+                 architecture='resnet',  # Architecture: 'orig', 'skip', 'resnet'.
+                 mbstd_group_size=4,  # Group size for the minibatch standard deviation layer, None = entire minibatch.
+                 mbstd_num_channels=1,  # Number of features for the minibatch standard deviation layer, 0 = disable.
+                 activation='lrelu',  # Activation function: 'relu', 'lrelu', etc.
+                 conv_clamp=None,  # Clamp the output of convolution layers to +-X, None = disable clamping.
+                 ):
+        assert architecture in ['orig', 'skip', 'resnet']
+        super().__init__()
+        self.in_channels = in_channels
+        self.cmap_dim = cmap_dim
+        self.resolution = resolution
+        self.img_channels = img_channels
+        self.architecture = architecture
+
+        if architecture == 'skip':
+            self.fromrgb = Conv2dLayer(img_channels, in_channels, kernel_size=1, activation=activation)
+        self.mbstd = MinibatchStdLayer(group_size=mbstd_group_size,
+                                       num_channels=mbstd_num_channels) if mbstd_num_channels > 0 else None
+        self.conv = Conv2dLayer(in_channels + mbstd_num_channels, in_channels, kernel_size=3, activation=activation,
+                                conv_clamp=conv_clamp)
+        self.fc = FullyConnectedLayer(in_channels * resolution[0] * resolution[1], in_channels, activation=activation)
+        self.out = FullyConnectedLayer(in_channels, 1 if cmap_dim == 0 else cmap_dim)
+
+    def forward(self, x, img, cmap, force_fp32=False):
+        misc.assert_shape(x, [None, self.in_channels, self.resolution[0], self.resolution[1]])  # [NCHW]
+        _ = force_fp32  # unused
+        dtype = torch.float32
+        memory_format = torch.contiguous_format
+
+        # FromRGB.
+        x = x.to(dtype=dtype, memory_format=memory_format)
+        if self.architecture == 'skip':
+            misc.assert_shape(img, [None, self.img_channels, self.resolution[0], self.resolution[1]])
+            img = img.to(dtype=dtype, memory_format=memory_format)
+            x = x + self.fromrgb(img)
+
+        # Main layers.
+        if self.mbstd is not None:
+            x = self.mbstd(x)
+        x = self.conv(x)
+        x = self.fc(x.flatten(1))
+        x = self.out(x)
+
+        # Conditioning.
+        if self.cmap_dim > 0:
+            misc.assert_shape(cmap, [None, self.cmap_dim])
+            x = (x * cmap).sum(dim=1, keepdim=True) * (1 / np.sqrt(self.cmap_dim))
+
+        assert x.dtype == dtype
+        return x
+
+    def extra_repr(self):
+        return f'resolution={self.resolution[0]:d}x{self.resolution[1]:d}, architecture={self.architecture:s}'
+
+
+# ----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class Discriminator(torch.nn.Module):
+    def __init__(self,
+                 c_dim,  # Conditioning label (C) dimensionality.
+                 img_resolution,  # Input resolution.
+                 img_channels,  # Number of input color channels.
+                 architecture='resnet',  # Architecture: 'orig', 'skip', 'resnet'.
+                 channel_base=32768,  # Overall multiplier for the number of channels.
+                 channel_max=512,  # Maximum number of channels in any layer.
+                 num_fp16_res=4,  # Use FP16 for the N highest resolutions.
+                 conv_clamp=256,  # Clamp the output of convolution layers to +-X, None = disable clamping.
+                 cmap_dim=None,  # Dimensionality of mapped conditioning label, None = default.
+                 block_kwargs={},  # Arguments for DiscriminatorBlock.
+                 mapping_kwargs={},  # Arguments for MappingNetwork.
+                 epilogue_kwargs={},  # Arguments for DiscriminatorEpilogue.
+                 ):
+        super().__init__()
+        self.c_dim = c_dim
+        self.img_resolution = img_resolution
+        self.img_resolution_log2 = int(np.log2(min(img_resolution)))
+        self.min_h = img_resolution[0] // min(img_resolution)
+        self.min_w = img_resolution[1] // min(img_resolution)
+        self.img_channels = img_channels
+        self.block_resolutions = [2 ** i for i in range(self.img_resolution_log2, 2, -1)]
+        channels_dict = {res: min(channel_base // res, channel_max) for res in self.block_resolutions + [4]}
+        fp16_resolution = max(2 ** (self.img_resolution_log2 + 1 - num_fp16_res), 8)
+
+        if cmap_dim is None:
+            cmap_dim = channels_dict[4]
+        if c_dim == 0:
+            cmap_dim = 0
+
+        common_kwargs = dict(img_channels=img_channels, architecture=architecture, conv_clamp=conv_clamp)
+        cur_layer_idx = 0
+        for res in self.block_resolutions:
+            in_channels = channels_dict[res] if res < min(img_resolution) else 0
+            tmp_channels = channels_dict[res]
+            out_channels = channels_dict[res // 2]
+            use_fp16 = (res >= fp16_resolution)
+            block = DiscriminatorBlock(in_channels, tmp_channels, out_channels,
+                                       resolution=(res * self.min_h, res * self.min_w),
+                                       first_layer_idx=cur_layer_idx, use_fp16=use_fp16, **block_kwargs,
+                                       **common_kwargs)
+            setattr(self, f'b{res}', block)
+            cur_layer_idx += block.num_layers
+        if c_dim > 0:
+            self.mapping = MappingNetwork(z_dim=0, c_dim=c_dim, w_dim=cmap_dim, num_ws=None, w_avg_beta=None,
+                                          **mapping_kwargs)
+        self.b4 = DiscriminatorEpilogue(channels_dict[4], cmap_dim=cmap_dim,
+                                        resolution=(4 * self.min_h, 4 * self.min_w), **epilogue_kwargs,
+                                        **common_kwargs)
+
+    def forward(self, img, c, update_emas=False, **block_kwargs):
+        _ = update_emas  # unused
+        x = None
+        for res in self.block_resolutions:
+            block = getattr(self, f'b{res}')
+            x, img = block(x, img, **block_kwargs)
+
+        cmap = None
+        if self.c_dim > 0:
+            cmap = self.mapping(None, c)
+        x = self.b4(x, img, cmap)
+        return x
+
+    def extra_repr(self):
+        return f'c_dim={self.c_dim:d}, img_resolution={self.img_resolution[0]:d}x{self.img_resolution[1]:d}, img_channels={self.img_channels:d}'
+
+# ----------------------------------------------------------------------------