update

stylegan_human/training_scripts/sg3/training/dataset.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+# Copyright (c) 2021, NVIDIA CORPORATION.  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
+from petrel_client.client import Client
+import cv2
+
+
+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.
+        square      = False,
+    ):
+        print('Inside Dataset')
+        self._name = name
+        self._raw_shape = list(raw_shape)
+        self._use_labels = use_labels
+        self._raw_labels = None
+        self._label_shape = None
+        self._square = square
+        print("inside dataset, _square: ", self._square)
+
+        # 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
+        if self._square:
+            assert self.image_shape[1] == self.image_shape[2]
+        else:
+            assert self.image_shape[1] == self.image_shape[2] * 2
+        return self.image_shape[1]
+
+    @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.
+        ceph            = False,
+        square          = False,
+        **super_kwargs,         # Additional arguments for the Dataset base class.
+    ):
+        self._path = path 
+        self._zipfile = None
+        self._square = square
+
+        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 or raw_shape[3] != resolution):
+            # raise IOError('Image files do not match the specified resolution')
+        if resolution is not None:
+            if self._square: 
+                raw_shape[2] = raw_shape[3]   = resolution  
+            else:
+                raw_shape[2] = resolution      
+                raw_shape[3] = resolution // 2 
+            # print(raw_shape)
+        super().__init__(name=name, raw_shape=raw_shape,square=square, **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
+
+#----------------------------------------------------------------------------

stylegan_human/training_scripts/sg3/training/networks_stylegan2.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+# 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?
+        square          = False,        # default if for rectangle images
+    ):
+        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.square=square
+
+        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:
+            if self.square:
+                self.register_buffer('noise_const', torch.randn([resolution, resolution])) 
+            else:
+                self.register_buffer('noise_const', torch.randn([resolution, resolution // 2]))  
+            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 // self.up
+        if self.square:
+            misc.assert_shape(x, [None, self.weight.shape[1], in_resolution, in_resolution])
+        else:
+            misc.assert_shape(x, [None, self.weight.shape[1], in_resolution, in_resolution // 2]) 
+        styles = self.affine(w)
+
+        noise = None
+        if self.use_noise and noise_mode == 'random':
+            if self.square:
+                noise = torch.randn([x.shape[0], 1, self.resolution, self.resolution], device=x.device) * self.noise_strength
+            else:
+                noise = torch.randn([x.shape[0], 1, self.resolution, self.resolution // 2], 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: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?
+        square                  = False,        # default is for rectangle images
+        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
+        self.square = square
+
+        if in_channels == 0:
+            if self.square:
+                self.const = torch.nn.Parameter(torch.randn([out_channels, resolution, resolution]))
+            else: # rectangle
+                self.const = torch.nn.Parameter(torch.randn([out_channels, resolution, resolution // 2])) 
+
+        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,  square=square, **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, square=square, **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:
+            if self.square:
+                misc.assert_shape(x, [None, self.in_channels, self.resolution // 2, self.resolution // 2])
+            else: # rectangle
+                misc.assert_shape(x, [None, self.in_channels, self.resolution // 2, self.resolution // 4]) 
+            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:
+            if self.square:
+                misc.assert_shape(img, [None, self.img_channels, self.resolution // 2, self.resolution // 2])
+            else:
+                misc.assert_shape(img, [None, self.img_channels, self.resolution // 2, self.resolution // 4]) 
+            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: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.
+        square,
+        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 >= 4 and img_resolution & (img_resolution - 1) == 0
+        super().__init__()
+        self.w_dim = w_dim
+        self.img_resolution = img_resolution
+        self.img_resolution_log2 = int(np.log2(img_resolution))
+        self.img_channels = img_channels
+        self.square=square
+        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 == self.img_resolution)
+            block = SynthesisBlock(in_channels, out_channels, w_dim=w_dim, resolution=res,
+                img_channels=img_channels, is_last=is_last, use_fp16=use_fp16, square=square,**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:d}, 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.
+        square,
+        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.square = square
+        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, square=square, **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.
+        square              = False,
+    ):
+        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.square = square
+
+        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:
+            if self.square:
+                misc.assert_shape(x, [None, self.in_channels, self.resolution, self.resolution])
+            else:
+                misc.assert_shape(x, [None, self.in_channels, self.resolution, self.resolution // 2]) 
+            x = x.to(dtype=dtype, memory_format=memory_format)
+
+        # FromRGB.
+        if self.in_channels == 0 or self.architecture == 'skip':
+            if self.square:
+                misc.assert_shape(img, [None, self.img_channels, self.resolution, self.resolution])
+            else:   
+                misc.assert_shape(img, [None, self.img_channels, self.resolution, self.resolution // 2]) 
+            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: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.
+        square              = False,
+    ):
+        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
+        self.square = square
+
+        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)
+
+        if self.square:
+            self.fc = FullyConnectedLayer(in_channels * (resolution ** 2), in_channels, activation=activation)
+        else:
+            self.fc = FullyConnectedLayer(in_channels * (resolution ** 2 // 2), 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):
+        if self.square:
+            misc.assert_shape(x, [None, self.in_channels, self.resolution, self.resolution])
+        else:
+            misc.assert_shape(x, [None, self.in_channels, self.resolution, self.resolution // 2]) # [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':
+            if self.square:
+                misc.assert_shape(img, [None, self.img_channels, self.resolution, self.resolution])
+            else:
+                misc.assert_shape(img, [None, self.img_channels, self.resolution, self.resolution // 2]) 
+            
+            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: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.
+        square              = False,    # default for rectangle images
+        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(img_resolution))
+        self.img_channels = img_channels
+        self.square = square
+        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 < 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,
+                first_layer_idx=cur_layer_idx, use_fp16=use_fp16, square=square, **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, square=square, **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:d}, img_channels={self.img_channels:d}'
+
+#----------------------------------------------------------------------------

stylegan_human/training_scripts/sg3/training/networks_stylegan3.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+# 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.
+
+"""Generator architecture from the paper
+"Alias-Free Generative Adversarial Networks"."""
+
+import numpy as np
+import scipy.signal
+import scipy.optimize
+import torch
+from torch_utils import misc
+from torch_utils import persistence
+from torch_utils.ops import conv2d_gradfix
+from torch_utils.ops import filtered_lrelu
+from torch_utils.ops import bias_act
+
+#----------------------------------------------------------------------------
+
+@misc.profiled_function
+def modulated_conv2d(
+    x,                  # Input tensor: [batch_size, in_channels, in_height, in_width]
+    w,                  # Weight tensor: [out_channels, in_channels, kernel_height, kernel_width]
+    s,                  # Style tensor: [batch_size, in_channels]
+    demodulate  = True, # Apply weight demodulation?
+    padding     = 0,    # Padding: int or [padH, padW]
+    input_gain  = None, # Optional scale factors for the input channels: [], [in_channels], or [batch_size, in_channels]
+):
+    with misc.suppress_tracer_warnings(): # this value will be treated as a constant
+        batch_size = int(x.shape[0])
+    out_channels, in_channels, kh, kw = w.shape
+    misc.assert_shape(w, [out_channels, in_channels, kh, kw]) # [OIkk]
+    misc.assert_shape(x, [batch_size, in_channels, None, None]) # [NIHW]
+    misc.assert_shape(s, [batch_size, in_channels]) # [NI]
+
+    # Pre-normalize inputs.
+    if demodulate:
+        w = w * w.square().mean([1,2,3], keepdim=True).rsqrt()
+        s = s * s.square().mean().rsqrt()
+
+    # Modulate weights.
+    w = w.unsqueeze(0) # [NOIkk]
+    w = w * s.unsqueeze(1).unsqueeze(3).unsqueeze(4) # [NOIkk]
+
+    # Demodulate weights.
+    if demodulate:
+        dcoefs = (w.square().sum(dim=[2,3,4]) + 1e-8).rsqrt() # [NO]
+        w = w * dcoefs.unsqueeze(2).unsqueeze(3).unsqueeze(4) # [NOIkk]
+
+    # Apply input scaling.
+    if input_gain is not None:
+        input_gain = input_gain.expand(batch_size, in_channels) # [NI]
+        w = w * input_gain.unsqueeze(1).unsqueeze(3).unsqueeze(4) # [NOIkk]
+
+    # Execute as one fused op using grouped convolution.
+    x = x.reshape(1, -1, *x.shape[2:])
+    w = w.reshape(-1, in_channels, kh, kw)
+    x = conv2d_gradfix.conv2d(input=x, weight=w.to(x.dtype), padding=padding, groups=batch_size)
+    x = x.reshape(batch_size, -1, *x.shape[2:])
+    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.
+        activation      = 'linear', # Activation function: 'relu', 'lrelu', etc.
+        bias            = True,     # Apply additive bias before the activation function?
+        lr_multiplier   = 1,        # Learning rate multiplier.
+        weight_init     = 1,        # Initial standard deviation of the weight tensor.
+        bias_init       = 0,        # Initial value of 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]) * (weight_init / lr_multiplier))
+        bias_init = np.broadcast_to(np.asarray(bias_init, dtype=np.float32), [out_features])
+        self.bias = torch.nn.Parameter(torch.from_numpy(bias_init / lr_multiplier)) 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 MappingNetwork(torch.nn.Module):
+    def __init__(self,
+        z_dim,                      # Input latent (Z) dimensionality.
+        c_dim,                      # Conditioning label (C) dimensionality, 0 = no labels.
+        w_dim,                      # Intermediate latent (W) dimensionality.
+        num_ws,                     # Number of intermediate latents to output.
+        num_layers      = 2,        # Number of mapping layers.
+        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.
+    ):
+        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
+
+        # Construct layers.
+        self.embed = FullyConnectedLayer(self.c_dim, self.w_dim) if self.c_dim > 0 else None
+        features = [self.z_dim + (self.w_dim if self.c_dim > 0 else 0)] + [self.w_dim] * self.num_layers
+        for idx, in_features, out_features in zip(range(num_layers), features[:-1], features[1:]):
+            layer = FullyConnectedLayer(in_features, out_features, activation='lrelu', lr_multiplier=lr_multiplier)
+            setattr(self, f'fc{idx}', layer)
+        self.register_buffer('w_avg', torch.zeros([w_dim]))
+
+    def forward(self, z, c, truncation_psi=1, truncation_cutoff=None, update_emas=False):
+        misc.assert_shape(z, [None, self.z_dim])
+        if truncation_cutoff is None:
+            truncation_cutoff = self.num_ws
+
+        # Embed, normalize, and concatenate inputs.
+        x = z.to(torch.float32)
+        x = x * (x.square().mean(1, keepdim=True) + 1e-8).rsqrt()
+        if self.c_dim > 0:
+            misc.assert_shape(c, [None, self.c_dim])
+            y = self.embed(c.to(torch.float32))
+            y = y * (y.square().mean(1, keepdim=True) + 1e-8).rsqrt()
+            x = torch.cat([x, y], dim=1) if x is not None else y
+
+        # Execute layers.
+        for idx in range(self.num_layers):
+            x = getattr(self, f'fc{idx}')(x)
+
+        # Update moving average of W.
+        if update_emas:
+            self.w_avg.copy_(x.detach().mean(dim=0).lerp(self.w_avg, self.w_avg_beta))
+
+        # Broadcast and apply truncation.
+        x = x.unsqueeze(1).repeat([1, self.num_ws, 1])
+        if truncation_psi != 1:
+            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 SynthesisInput(torch.nn.Module):
+    def __init__(self,
+        w_dim,          # Intermediate latent (W) dimensionality.
+        channels,       # Number of output channels.
+        size,           # Output spatial size: int or [width, height].
+        sampling_rate,  # Output sampling rate.
+        bandwidth,      # Output bandwidth.
+        square,
+    ):
+        super().__init__()
+        self.w_dim = w_dim
+        self.channels = channels
+        self.square = square
+        if self.square:
+            self.size = np.broadcast_to(np.asarray(size), [2])
+        else:
+            self.size = np.array([size // 2, size]) # [width, height]
+        self.sampling_rate = sampling_rate
+        self.bandwidth = bandwidth
+
+        # Draw random frequencies from uniform 2D disc.
+        freqs = torch.randn([self.channels, 2])
+        radii = freqs.square().sum(dim=1, keepdim=True).sqrt()
+        freqs /= radii * radii.square().exp().pow(0.25)
+        freqs *= bandwidth
+        phases = torch.rand([self.channels]) - 0.5
+
+        # Setup parameters and buffers.
+        self.weight = torch.nn.Parameter(torch.randn([self.channels, self.channels]))
+        self.affine = FullyConnectedLayer(w_dim, 4, weight_init=0, bias_init=[1,0,0,0])
+        self.register_buffer('transform', torch.eye(3, 3)) # User-specified inverse transform wrt. resulting image.
+        self.register_buffer('freqs', freqs)
+        self.register_buffer('phases', phases)
+
+    def forward(self, w):
+        # Introduce batch dimension.
+        transforms = self.transform.unsqueeze(0) # [batch, row, col]
+        freqs = self.freqs.unsqueeze(0) # [batch, channel, xy]
+        phases = self.phases.unsqueeze(0) # [batch, channel]
+
+        # Apply learned transformation.
+        t = self.affine(w) # t = (r_c, r_s, t_x, t_y)
+        t = t / t[:, :2].norm(dim=1, keepdim=True) # t' = (r'_c, r'_s, t'_x, t'_y)
+        m_r = torch.eye(3, device=w.device).unsqueeze(0).repeat([w.shape[0], 1, 1]) # Inverse rotation wrt. resulting image.
+        m_r[:, 0, 0] = t[:, 0]  # r'_c
+        m_r[:, 0, 1] = -t[:, 1] # r'_s
+        m_r[:, 1, 0] = t[:, 1]  # r'_s
+        m_r[:, 1, 1] = t[:, 0]  # r'_c
+        m_t = torch.eye(3, device=w.device).unsqueeze(0).repeat([w.shape[0], 1, 1]) # Inverse translation wrt. resulting image.
+        m_t[:, 0, 2] = -t[:, 2] # t'_x
+        m_t[:, 1, 2] = -t[:, 3] # t'_y
+        transforms = m_r @ m_t @ transforms # First rotate resulting image, then translate, and finally apply user-specified transform.
+
+        # Transform frequencies.
+        phases = phases + (freqs @ transforms[:, :2, 2:]).squeeze(2)
+        freqs = freqs @ transforms[:, :2, :2]
+
+        # Dampen out-of-band frequencies that may occur due to the user-specified transform.
+        amplitudes = (1 - (freqs.norm(dim=2) - self.bandwidth) / (self.sampling_rate / 2 - self.bandwidth)).clamp(0, 1)
+
+        # Construct sampling grid.
+        theta = torch.eye(2, 3, device=w.device)
+        theta[0, 0] = 0.5 * self.size[0] / self.sampling_rate
+        theta[1, 1] = 0.5 * self.size[1] / self.sampling_rate
+        grids = torch.nn.functional.affine_grid(theta.unsqueeze(0), [1, 1, self.size[1], self.size[0]], align_corners=False)
+
+        # Compute Fourier features.
+        x = (grids.unsqueeze(3) @ freqs.permute(0, 2, 1).unsqueeze(1).unsqueeze(2)).squeeze(3) # [batch, height, width, channel]
+        x = x + phases.unsqueeze(1).unsqueeze(2)
+        x = torch.sin(x * (np.pi * 2))
+        x = x * amplitudes.unsqueeze(1).unsqueeze(2)
+
+        # Apply trainable mapping.
+        weight = self.weight / np.sqrt(self.channels)
+        x = x @ weight.t()
+
+        # Ensure correct shape.
+        x = x.permute(0, 3, 1, 2) # [batch, channel, height, width]
+        misc.assert_shape(x, [w.shape[0], self.channels, int(self.size[1]), int(self.size[0])])
+        return x
+
+    def extra_repr(self):
+        return '\n'.join([
+            f'w_dim={self.w_dim:d}, channels={self.channels:d}, size={list(self.size)},',
+            f'sampling_rate={self.sampling_rate:g}, bandwidth={self.bandwidth:g}'])
+
+#----------------------------------------------------------------------------
+
+@persistence.persistent_class
+class SynthesisLayer(torch.nn.Module):
+    def __init__(self,
+        w_dim,                          # Intermediate latent (W) dimensionality.
+        is_torgb,                       # Is this the final ToRGB layer?
+        is_critically_sampled,          # Does this layer use critical sampling?
+        use_fp16,                       # Does this layer use FP16?
+
+        # Input & output specifications.
+        in_channels,                    # Number of input channels.
+        out_channels,                   # Number of output channels.
+        in_size,                        # Input spatial size: int or [width, height].
+        out_size,                       # Output spatial size: int or [width, height].
+        in_sampling_rate,               # Input sampling rate (s).
+        out_sampling_rate,              # Output sampling rate (s).
+        in_cutoff,                      # Input cutoff frequency (f_c).
+        out_cutoff,                     # Output cutoff frequency (f_c).
+        in_half_width,                  # Input transition band half-width (f_h).
+        out_half_width,                 # Output Transition band half-width (f_h).
+
+        # Hyperparameters.
+        conv_kernel         = 3,        # Convolution kernel size. Ignored for final the ToRGB layer.
+        filter_size         = 6,        # Low-pass filter size relative to the lower resolution when up/downsampling.
+        lrelu_upsampling    = 2,        # Relative sampling rate for leaky ReLU. Ignored for final the ToRGB layer.
+        use_radial_filters  = False,    # Use radially symmetric downsampling filter? Ignored for critically sampled layers.
+        conv_clamp          = 256,      # Clamp the output to [-X, +X], None = disable clamping.
+        magnitude_ema_beta  = 0.999,    # Decay rate for the moving average of input magnitudes.
+        square              = False,    # default if for rectangle images
+    ):
+        super().__init__()
+        self.w_dim = w_dim
+        self.is_torgb = is_torgb
+        self.is_critically_sampled = is_critically_sampled
+        self.use_fp16 = use_fp16
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        self.square = square
+        if self.square:  
+            self.in_size = np.broadcast_to(np.asarray(in_size), [2])
+            self.out_size = np.broadcast_to(np.asarray(out_size), [2])
+        else:
+            # self.in_size = np.array[in_size, in_size//2]
+            self.in_size = np.array([in_size // 2, in_size])
+            # self.out_size = np.array[out_size, out_size//2]
+            self.out_size = np.array([out_size // 2, out_size])
+        self.in_sampling_rate = in_sampling_rate
+        self.out_sampling_rate = out_sampling_rate
+        self.tmp_sampling_rate = max(in_sampling_rate, out_sampling_rate) * (1 if is_torgb else lrelu_upsampling)
+        self.in_cutoff = in_cutoff
+        self.out_cutoff = out_cutoff
+        self.in_half_width = in_half_width
+        self.out_half_width = out_half_width
+        self.conv_kernel = 1 if is_torgb else conv_kernel
+        self.conv_clamp = conv_clamp
+        self.magnitude_ema_beta = magnitude_ema_beta
+
+        # Setup parameters and buffers.
+        self.affine = FullyConnectedLayer(self.w_dim, self.in_channels, bias_init=1)
+        self.weight = torch.nn.Parameter(torch.randn([self.out_channels, self.in_channels, self.conv_kernel, self.conv_kernel]))
+        self.bias = torch.nn.Parameter(torch.zeros([self.out_channels]))
+        self.register_buffer('magnitude_ema', torch.ones([]))
+
+        # Design upsampling filter.
+        self.up_factor = int(np.rint(self.tmp_sampling_rate / self.in_sampling_rate))
+        assert self.in_sampling_rate * self.up_factor == self.tmp_sampling_rate
+        self.up_taps = filter_size * self.up_factor if self.up_factor > 1 and not self.is_torgb else 1
+        self.register_buffer('up_filter', self.design_lowpass_filter(
+            numtaps=self.up_taps, cutoff=self.in_cutoff, width=self.in_half_width*2, fs=self.tmp_sampling_rate))
+
+        # Design downsampling filter.
+        self.down_factor = int(np.rint(self.tmp_sampling_rate / self.out_sampling_rate))
+        assert self.out_sampling_rate * self.down_factor == self.tmp_sampling_rate
+        self.down_taps = filter_size * self.down_factor if self.down_factor > 1 and not self.is_torgb else 1
+        self.down_radial = use_radial_filters and not self.is_critically_sampled
+        self.register_buffer('down_filter', self.design_lowpass_filter(
+            numtaps=self.down_taps, cutoff=self.out_cutoff, width=self.out_half_width*2, fs=self.tmp_sampling_rate, radial=self.down_radial))
+
+        # Compute padding.
+        pad_total = (self.out_size - 1) * self.down_factor + 1 # Desired output size before downsampling.
+        pad_total -= (self.in_size + self.conv_kernel - 1) * self.up_factor # Input size after upsampling.
+        pad_total += self.up_taps + self.down_taps - 2 # Size reduction caused by the filters.
+        pad_lo = (pad_total + self.up_factor) // 2 # Shift sample locations according to the symmetric interpretation (Appendix C.3).
+        pad_hi = pad_total - pad_lo
+        self.padding = [int(pad_lo[0]), int(pad_hi[0]), int(pad_lo[1]), int(pad_hi[1])]
+
+    def forward(self, x, w, noise_mode='random', force_fp32=False, update_emas=False):
+        assert noise_mode in ['random', 'const', 'none'] # unused
+        misc.assert_shape(x, [None, self.in_channels, int(self.in_size[1]), int(self.in_size[0])])
+        misc.assert_shape(w, [x.shape[0], self.w_dim])
+
+        # Track input magnitude.
+        if update_emas:
+            with torch.autograd.profiler.record_function('update_magnitude_ema'):
+                magnitude_cur = x.detach().to(torch.float32).square().mean()
+                self.magnitude_ema.copy_(magnitude_cur.lerp(self.magnitude_ema, self.magnitude_ema_beta))
+        input_gain = self.magnitude_ema.rsqrt()
+
+        # Execute affine layer.
+        styles = self.affine(w)
+        if self.is_torgb:
+            weight_gain = 1 / np.sqrt(self.in_channels * (self.conv_kernel ** 2))
+            styles = styles * weight_gain
+
+        # Execute modulated conv2d.
+        dtype = torch.float16 if (self.use_fp16 and not force_fp32 and x.device.type == 'cuda') else torch.float32
+        x = modulated_conv2d(x=x.to(dtype), w=self.weight, s=styles,
+            padding=self.conv_kernel-1, demodulate=(not self.is_torgb), input_gain=input_gain)
+
+        # Execute bias, filtered leaky ReLU, and clamping.
+        gain = 1 if self.is_torgb else np.sqrt(2)
+        slope = 1 if self.is_torgb else 0.2
+        x = filtered_lrelu.filtered_lrelu(x=x, fu=self.up_filter, fd=self.down_filter, b=self.bias.to(x.dtype),
+            up=self.up_factor, down=self.down_factor, padding=self.padding, gain=gain, slope=slope, clamp=self.conv_clamp)
+
+        # Ensure correct shape and dtype.
+        misc.assert_shape(x, [None, self.out_channels, int(self.out_size[1]), int(self.out_size[0])])
+        assert x.dtype == dtype
+        return x
+
+    @staticmethod
+    def design_lowpass_filter(numtaps, cutoff, width, fs, radial=False):
+        assert numtaps >= 1
+
+        # Identity filter.
+        if numtaps == 1:
+            return None
+
+        # Separable Kaiser low-pass filter.
+        if not radial:
+            f = scipy.signal.firwin(numtaps=numtaps, cutoff=cutoff, width=width, fs=fs)
+            return torch.as_tensor(f, dtype=torch.float32)
+
+        # Radially symmetric jinc-based filter.
+        x = (np.arange(numtaps) - (numtaps - 1) / 2) / fs
+        r = np.hypot(*np.meshgrid(x, x))
+        f = scipy.special.j1(2 * cutoff * (np.pi * r)) / (np.pi * r)
+        beta = scipy.signal.kaiser_beta(scipy.signal.kaiser_atten(numtaps, width / (fs / 2)))
+        w = np.kaiser(numtaps, beta)
+        f *= np.outer(w, w)
+        f /= np.sum(f)
+        return torch.as_tensor(f, dtype=torch.float32)
+
+    def extra_repr(self):
+        return '\n'.join([
+            f'w_dim={self.w_dim:d}, is_torgb={self.is_torgb},',
+            f'is_critically_sampled={self.is_critically_sampled}, use_fp16={self.use_fp16},',
+            f'in_sampling_rate={self.in_sampling_rate:g}, out_sampling_rate={self.out_sampling_rate:g},',
+            f'in_cutoff={self.in_cutoff:g}, out_cutoff={self.out_cutoff:g},',
+            f'in_half_width={self.in_half_width:g}, out_half_width={self.out_half_width:g},',
+            f'in_size={list(self.in_size)}, out_size={list(self.out_size)},',
+            f'in_channels={self.in_channels:d}, out_channels={self.out_channels:d}'])
+
+#----------------------------------------------------------------------------
+
+@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.
+        square,
+        channel_base        = 32768,    # Overall multiplier for the number of channels.
+        channel_max         = 512,      # Maximum number of channels in any layer.
+        num_layers          = 14,       # Total number of layers, excluding Fourier features and ToRGB.
+        num_critical        = 2,        # Number of critically sampled layers at the end.
+        first_cutoff        = 2,        # Cutoff frequency of the first layer (f_{c,0}).
+        first_stopband      = 2**2.1,   # Minimum stopband of the first layer (f_{t,0}).
+        last_stopband_rel   = 2**0.3,   # Minimum stopband of the last layer, expressed relative to the cutoff.
+        margin_size         = 10,       # Number of additional pixels outside the image.
+        output_scale        = 0.25,     # Scale factor for the output image.
+        num_fp16_res        = 4,        # Use FP16 for the N highest resolutions.
+        **layer_kwargs,                 # Arguments for SynthesisLayer.
+        
+    ):
+        super().__init__()
+        self.w_dim = w_dim
+        self.num_ws = num_layers + 2
+        self.img_resolution = img_resolution
+        self.img_channels = img_channels
+        self.num_layers = num_layers
+        self.num_critical = num_critical
+        self.margin_size = margin_size
+        self.output_scale = output_scale
+        self.num_fp16_res = num_fp16_res
+        self.square = square
+
+        # Geometric progression of layer cutoffs and min. stopbands.
+        last_cutoff = self.img_resolution / 2 # f_{c,N}
+        last_stopband = last_cutoff * last_stopband_rel # f_{t,N}
+        exponents = np.minimum(np.arange(self.num_layers + 1) / (self.num_layers - self.num_critical), 1)
+        cutoffs = first_cutoff * (last_cutoff / first_cutoff) ** exponents # f_c[i]
+        stopbands = first_stopband * (last_stopband / first_stopband) ** exponents # f_t[i]
+
+        # Compute remaining layer parameters.
+        sampling_rates = np.exp2(np.ceil(np.log2(np.minimum(stopbands * 2, self.img_resolution)))) # s[i]
+        half_widths = np.maximum(stopbands, sampling_rates / 2) - cutoffs # f_h[i]
+        sizes = sampling_rates + self.margin_size * 2
+        sizes[-2:] = self.img_resolution
+        channels = np.rint(np.minimum((channel_base / 2) / cutoffs, channel_max))
+        channels[-1] = self.img_channels
+
+        # Construct layers.
+        self.input = SynthesisInput(
+            w_dim=self.w_dim, channels=int(channels[0]), size=int(sizes[0]),
+            sampling_rate=sampling_rates[0], bandwidth=cutoffs[0], square=self.square)
+        self.layer_names = []
+        for idx in range(self.num_layers + 1):
+            prev = max(idx - 1, 0)
+            is_torgb = (idx == self.num_layers)
+            is_critically_sampled = (idx >= self.num_layers - self.num_critical)
+            use_fp16 = (sampling_rates[idx] * (2 ** self.num_fp16_res) > self.img_resolution)
+            layer = SynthesisLayer(
+                w_dim=self.w_dim, is_torgb=is_torgb, is_critically_sampled=is_critically_sampled, use_fp16=use_fp16,
+                in_channels=int(channels[prev]), out_channels= int(channels[idx]),
+                in_size=int(sizes[prev]), out_size=int(sizes[idx]),
+                in_sampling_rate=int(sampling_rates[prev]), out_sampling_rate=int(sampling_rates[idx]),
+                in_cutoff=cutoffs[prev], out_cutoff=cutoffs[idx],
+                in_half_width=half_widths[prev], out_half_width=half_widths[idx],
+                square=self.square,
+                **layer_kwargs)
+            name = f'L{idx}_{layer.out_size[0]}_{layer.out_channels}'
+            setattr(self, name, layer)
+            self.layer_names.append(name)
+
+    def forward(self, ws, **layer_kwargs):
+        misc.assert_shape(ws, [None, self.num_ws, self.w_dim])
+        ws = ws.to(torch.float32).unbind(dim=1)
+
+        # Execute layers.
+        x = self.input(ws[0])
+        for name, w in zip(self.layer_names, ws[1:]):
+            x = getattr(self, name)(x, w, **layer_kwargs)
+        if self.output_scale != 1:
+            x = x * self.output_scale
+
+        # Ensure correct shape and dtype.
+        if self.square:
+            misc.assert_shape(x, [None, self.img_channels, self.img_resolution, self.img_resolution])
+        else:
+            misc.assert_shape(x, [None, self.img_channels, self.img_resolution, self.img_resolution // 2])
+        x = x.to(torch.float32)
+        return x
+
+    def extra_repr(self):
+        return '\n'.join([
+            f'w_dim={self.w_dim:d}, num_ws={self.num_ws:d},',
+            f'img_resolution={self.img_resolution:d}, img_channels={self.img_channels:d},',
+            f'num_layers={self.num_layers:d}, num_critical={self.num_critical:d},',
+            f'margin_size={self.margin_size:d}, 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.
+        square,
+        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.square = square
+        self.synthesis = SynthesisNetwork(w_dim=w_dim, img_resolution=img_resolution, img_channels=img_channels, square=self.square, **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
+
+#----------------------------------------------------------------------------

stylegan_human/utils/ImagesDataset.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+
+import os
+from torch.utils.data import Dataset
+from PIL import Image
+
+from utils.data_utils import make_dataset
+
+
+class ImagesDataset(Dataset):
+
+    def __init__(self, source_root, source_transform=None):
+        self.source_paths = sorted(make_dataset(source_root))
+        self.source_transform = source_transform
+
+    def __len__(self):
+        return len(self.source_paths)
+
+    def __getitem__(self, index):
+        fname, from_path = self.source_paths[index]
+        from_im = Image.open(from_path).convert('RGB')
+        
+        if self.source_transform:
+            from_im = self.source_transform(from_im)
+
+        return fname, from_im
+

stylegan_human/utils/data_utils.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+
+import os
+
+from PIL import Image
+
+IMG_EXTENSIONS = [
+    '.jpg', '.JPG', '.jpeg', '.JPEG',
+    '.png', '.PNG', '.ppm', '.PPM', '.bmp', '.BMP', '.tiff'
+]
+
+
+def is_image_file(filename):
+    return any(filename.endswith(extension) for extension in IMG_EXTENSIONS)
+
+
+def tensor2im(var):
+    # var shape: (3, H, W)
+    var = var.cpu().detach().transpose(0, 2).transpose(0, 1).numpy()
+    var = ((var + 1) / 2)
+    var[var < 0] = 0
+    var[var > 1] = 1
+    var = var * 255
+    return Image.fromarray(var.astype('uint8'))
+
+
+def make_dataset(dir):
+    images = []
+    assert os.path.isdir(dir), '%s is not a valid directory' % dir
+    for root, _, fnames in sorted(os.walk(dir)):
+        for fname in fnames:
+            if is_image_file(fname):
+                path = os.path.join(root, fname)
+                fname = fname.split('.')[0]
+                images.append((fname, path))
+    return images

stylegan_human/utils/face_alignment.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+import numpy as np
+import PIL
+import PIL.Image
+import scipy
+import scipy.ndimage
+import dlib
+import copy
+from PIL import Image
+
+def get_landmark(img, detector, predictor):
+    """get landmark with dlib
+    :return: np.array shape=(68, 2)
+    """
+    # detector = dlib.get_frontal_face_detector()
+    # dets, _, _ = detector.run(img, 1, -1)
+    dets = detector(img, 1)
+    for k, d in enumerate(dets):
+        shape = predictor(img, d.rect)
+    t = list(shape.parts())
+    a = []
+    for tt in t:
+        a.append([tt.x, tt.y])
+    lm = np.array(a)
+    
+    # face rect
+    face_rect = [dets[0].rect.left(), dets[0].rect.top(), dets[0].rect.right(), dets[0].rect.bottom()]
+    return lm, face_rect
+
+
+    
+
+def align_face_for_insetgan(img, detector, predictor, output_size=256):
+    """
+    :param img: numpy array rgb
+    :return: PIL Image
+    """
+    img_cp = copy.deepcopy(img)
+    lm, face_rect = get_landmark(img, detector, predictor)
+
+    lm_chin = lm[0: 17]  # left-right
+    lm_eyebrow_left = lm[17: 22]  # left-right
+    lm_eyebrow_right = lm[22: 27]  # left-right
+    lm_nose = lm[27: 31]  # top-down
+    lm_nostrils = lm[31: 36]  # top-down
+    lm_eye_left = lm[36: 42]  # left-clockwise
+    lm_eye_right = lm[42: 48]  # left-clockwise
+    lm_mouth_outer = lm[48: 60]  # left-clockwise
+    lm_mouth_inner = lm[60: 68]  # left-clockwise
+
+    # Calculate auxiliary vectors.
+    eye_left = np.mean(lm_eye_left, axis=0)
+    eye_right = np.mean(lm_eye_right, axis=0)
+    eye_avg = (eye_left + eye_right) * 0.5
+    eye_to_eye = eye_right - eye_left
+    mouth_left = lm_mouth_outer[0]
+    mouth_right = lm_mouth_outer[6]
+    mouth_avg = (mouth_left + mouth_right) * 0.5
+    eye_to_mouth = mouth_avg - eye_avg
+
+    # Choose oriented crop rectangle.
+    x = eye_to_eye - np.flipud(eye_to_mouth) * [-1, 1]
+    x /= np.hypot(*x)
+    x *= max(np.hypot(*eye_to_eye) * 2.0, np.hypot(*eye_to_mouth) * 1.8)
+    y = np.flipud(x) * [-1, 1]
+    c = eye_avg + eye_to_mouth * 0.1
+    quad = np.stack([c - x - y, c - x + y, c + x + y, c + x - y])
+    qsize = np.hypot(*x) * 2
+
+    # read image
+    # opencv to PIL
+    img = PIL.Image.fromarray(img_cp)
+    # img = PIL.Image.open(filepath)
+
+    transform_size = output_size
+    enable_padding = False
+
+    # Shrink.
+    # shrink = int(np.floor(qsize / output_size * 0.5))
+    # if shrink > 1:
+    #     rsize = (int(np.rint(float(img.size[0]) / shrink)), int(np.rint(float(img.size[1]) / shrink)))
+    #     img = img.resize(rsize, PIL.Image.ANTIALIAS)
+    #     quad /= shrink
+    #     qsize /= shrink
+
+    # Crop.
+    border = max(int(np.rint(qsize * 0.1)), 3)
+    crop = (int(np.floor(min(quad[:, 0]))), int(np.floor(min(quad[:, 1]))), int(np.ceil(max(quad[:, 0]))),
+            int(np.ceil(max(quad[:, 1]))))
+    
+    # crop = (max(crop[0] - border, 0), max(crop[1] - border, 0), min(crop[2] + border, img.size[0]),
+    #         min(crop[3] + border, img.size[1]))
+    # img.save("debug/raw.jpg")
+    if crop[2] - crop[0] < img.size[0] or crop[3] - crop[1] < img.size[1]:
+        img = img.crop(crop)
+        quad -= crop[0:2]
+    # img.save("debug/crop.jpg")
+    # Pad.
+    # pad = (int(np.floor(min(quad[:, 0]))), int(np.floor(min(quad[:, 1]))), int(np.ceil(max(quad[:, 0]))),
+    #        int(np.ceil(max(quad[:, 1]))))
+    # pad = (max(-pad[0] + border, 0), max(-pad[1] + border, 0), max(pad[2] - img.size[0] + border, 0),
+    #        max(pad[3] - img.size[1] + border, 0))
+    # if enable_padding and max(pad) > border - 4:
+    #     pad = np.maximum(pad, int(np.rint(qsize * 0.3)))
+    #     img = np.pad(np.float32(img), ((pad[1], pad[3]), (pad[0], pad[2]), (0, 0)), 'reflect')
+    #     h, w, _ = img.shape
+    #     y, x, _ = np.ogrid[:h, :w, :1]
+    #     mask = np.maximum(1.0 - np.minimum(np.float32(x) / pad[0], np.float32(w - 1 - x) / pad[2]),
+    #                       1.0 - np.minimum(np.float32(y) / pad[1], np.float32(h - 1 - y) / pad[3]))
+    #     blur = qsize * 0.02
+    #     img += (scipy.ndimage.gaussian_filter(img, [blur, blur, 0]) - img) * np.clip(mask * 3.0 + 1.0, 0.0, 1.0)
+    #     img += (np.median(img, axis=(0, 1)) - img) * np.clip(mask, 0.0, 1.0)
+    #     img = PIL.Image.fromarray(np.uint8(np.clip(np.rint(img), 0, 255)), 'RGB')
+    #     quad += pad[:2]
+
+    # Transform.
+    # crop shape to transform shape
+    # nw = 
+    # print(img.size, quad+0.5, np.bound((quad+0.5).flatten()))
+    # assert False
+    # img = img.transform((transform_size, transform_size), PIL.Image.QUAD, (quad + 0.5).flatten(), PIL.Image.BILINEAR)
+    
+    # img.save("debug/transform.jpg")
+    # if output_size < transform_size:
+    img = img.resize((output_size, output_size), PIL.Image.ANTIALIAS)
+    # img.save("debug/resize.jpg")
+    # print((quad+crop[0:2]).flatten())
+    # assert False
+    # Return aligned image.
+    
+    return img, crop, face_rect
+
+
+
+
+def align_face_for_projector(img, detector, predictor, output_size):
+    """
+    :param filepath: str
+    :return: PIL Image
+    """
+
+    img_cp = copy.deepcopy(img)
+    lm, face_rect = get_landmark(img, detector, predictor)
+
+
+    lm_chin = lm[0: 17]  # left-right
+    lm_eyebrow_left = lm[17: 22]  # left-right
+    lm_eyebrow_right = lm[22: 27]  # left-right
+    lm_nose = lm[27: 31]  # top-down
+    lm_nostrils = lm[31: 36]  # top-down
+    lm_eye_left = lm[36: 42]  # left-clockwise
+    lm_eye_right = lm[42: 48]  # left-clockwise
+    lm_mouth_outer = lm[48: 60]  # left-clockwise
+    lm_mouth_inner = lm[60: 68]  # left-clockwise
+
+    # Calculate auxiliary vectors.
+    eye_left = np.mean(lm_eye_left, axis=0)
+    eye_right = np.mean(lm_eye_right, axis=0)
+    eye_avg = (eye_left + eye_right) * 0.5
+    eye_to_eye = eye_right - eye_left
+    mouth_left = lm_mouth_outer[0]
+    mouth_right = lm_mouth_outer[6]
+    mouth_avg = (mouth_left + mouth_right) * 0.5
+    eye_to_mouth = mouth_avg - eye_avg
+
+    # Choose oriented crop rectangle.
+    x = eye_to_eye - np.flipud(eye_to_mouth) * [-1, 1]
+    x /= np.hypot(*x)
+    x *= max(np.hypot(*eye_to_eye) * 2.0, np.hypot(*eye_to_mouth) * 1.8)
+    y = np.flipud(x) * [-1, 1]
+    c = eye_avg + eye_to_mouth * 0.1
+    quad = np.stack([c - x - y, c - x + y, c + x + y, c + x - y])
+    qsize = np.hypot(*x) * 2
+
+    # read image
+    img = PIL.Image.fromarray(img_cp)
+
+    transform_size = output_size
+    enable_padding = True
+
+    # Shrink.
+    shrink = int(np.floor(qsize / output_size * 0.5))
+    if shrink > 1:
+        rsize = (int(np.rint(float(img.size[0]) / shrink)), int(np.rint(float(img.size[1]) / shrink)))
+        img = img.resize(rsize, PIL.Image.ANTIALIAS)
+        quad /= shrink
+        qsize /= shrink
+
+    # Crop.
+    border = max(int(np.rint(qsize * 0.1)), 3)
+    crop = (int(np.floor(min(quad[:, 0]))), int(np.floor(min(quad[:, 1]))), int(np.ceil(max(quad[:, 0]))),
+            int(np.ceil(max(quad[:, 1]))))
+    crop = (max(crop[0] - border, 0), max(crop[1] - border, 0), min(crop[2] + border, img.size[0]),
+            min(crop[3] + border, img.size[1]))
+    if crop[2] - crop[0] < img.size[0] or crop[3] - crop[1] < img.size[1]:
+        img = img.crop(crop)
+        quad -= crop[0:2]
+
+    # Pad.
+    pad = (int(np.floor(min(quad[:, 0]))), int(np.floor(min(quad[:, 1]))), int(np.ceil(max(quad[:, 0]))),
+           int(np.ceil(max(quad[:, 1]))))
+    pad = (max(-pad[0] + border, 0), max(-pad[1] + border, 0), max(pad[2] - img.size[0] + border, 0),
+           max(pad[3] - img.size[1] + border, 0))
+    if enable_padding and max(pad) > border - 4:
+        pad = np.maximum(pad, int(np.rint(qsize * 0.3)))
+        img = np.pad(np.float32(img), ((pad[1], pad[3]), (pad[0], pad[2]), (0, 0)), 'reflect')
+        h, w, _ = img.shape
+        y, x, _ = np.ogrid[:h, :w, :1]
+        mask = np.maximum(1.0 - np.minimum(np.float32(x) / pad[0], np.float32(w - 1 - x) / pad[2]),
+                          1.0 - np.minimum(np.float32(y) / pad[1], np.float32(h - 1 - y) / pad[3]))
+        blur = qsize * 0.02
+        img += (scipy.ndimage.gaussian_filter(img, [blur, blur, 0]) - img) * np.clip(mask * 3.0 + 1.0, 0.0, 1.0)
+        img += (np.median(img, axis=(0, 1)) - img) * np.clip(mask, 0.0, 1.0)
+        img = PIL.Image.fromarray(np.uint8(np.clip(np.rint(img), 0, 255)), 'RGB')
+        quad += pad[:2]
+
+    # Transform.
+    img = img.transform((transform_size, transform_size), PIL.Image.QUAD, (quad + 0.5).flatten(), PIL.Image.BILINEAR)
+    if output_size < transform_size:
+        img = img.resize((output_size, output_size), PIL.Image.ANTIALIAS)
+
+    # Return aligned image.
+    return img
+
+
+def reverse_quad_transform(image, quad_to_map_to, alpha):
+    # forward mapping, for simplicity
+
+    result = Image.new("RGBA",image.size)
+    result_pixels = result.load()
+
+    width, height = result.size
+
+    for y in range(height):
+        for x in range(width):
+            result_pixels[x,y] = (0,0,0,0)
+
+    p1 = (quad_to_map_to[0],quad_to_map_to[1])
+    p2 = (quad_to_map_to[2],quad_to_map_to[3])
+    p3 = (quad_to_map_to[4],quad_to_map_to[5])
+    p4 = (quad_to_map_to[6],quad_to_map_to[7])
+
+    p1_p2_vec = (p2[0] - p1[0],p2[1] - p1[1])
+    p4_p3_vec = (p3[0] - p4[0],p3[1] - p4[1])
+
+    for y in range(height):
+        for x in range(width):
+            pixel = image.getpixel((x,y))
+
+            y_percentage = y / float(height)
+            x_percentage = x / float(width)
+
+            # interpolate vertically
+            pa = (p1[0] + p1_p2_vec[0] * y_percentage, p1[1] + p1_p2_vec[1] * y_percentage) 
+            pb = (p4[0] + p4_p3_vec[0] * y_percentage, p4[1] + p4_p3_vec[1] * y_percentage)
+
+            pa_to_pb_vec = (pb[0] - pa[0],pb[1] - pa[1])
+
+            # interpolate horizontally
+            p = (pa[0] + pa_to_pb_vec[0] * x_percentage, pa[1] + pa_to_pb_vec[1] * x_percentage)
+
+            try:
+                result_pixels[p[0],p[1]] = (pixel[0],pixel[1],pixel[2],min(int(alpha * 255),pixel[3]))
+            except Exception:
+                pass
+
+    return result
\ No newline at end of file

stylegan_human/utils/log_utils.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+
+import numpy as np
+from PIL import Image
+import wandb
+from pti.pti_configs import global_config
+import torch
+import matplotlib.pyplot as plt
+
+
+def log_image_from_w(w, G, name):
+    img = get_image_from_w(w, G)
+    pillow_image = Image.fromarray(img)
+    wandb.log(
+        {f"{name}": [
+            wandb.Image(pillow_image, caption=f"current inversion {name}")]},
+        step=global_config.training_step)
+
+
+def log_images_from_w(ws, G, names):
+    for name, w in zip(names, ws):
+        w = w.to(global_config.device)
+        log_image_from_w(w, G, name)
+
+
+def plot_image_from_w(w, G):
+    img = get_image_from_w(w, G)
+    pillow_image = Image.fromarray(img)
+    plt.imshow(pillow_image)
+    plt.show()
+
+
+def plot_image(img):
+    img = (img.permute(0, 2, 3, 1) * 127.5 + 128).clamp(0, 255).to(torch.uint8).detach().cpu().numpy()
+    pillow_image = Image.fromarray(img[0])
+    plt.imshow(pillow_image)
+    plt.show()
+
+
+def save_image(name, method_type, results_dir, image, run_id):
+    image.save(f'{results_dir}/{method_type}_{name}_{run_id}.jpg')
+
+
+def save_w(w, G, name, method_type, results_dir):
+    im = get_image_from_w(w, G)
+    im = Image.fromarray(im, mode='RGB')
+    save_image(name, method_type, results_dir, im)
+
+
+def save_concat_image(base_dir, image_latents, new_inv_image_latent, new_G,
+                      old_G,
+                      file_name,
+                      extra_image=None):
+    images_to_save = []
+    if extra_image is not None:
+        images_to_save.append(extra_image)
+    for latent in image_latents:
+        images_to_save.append(get_image_from_w(latent, old_G))
+    images_to_save.append(get_image_from_w(new_inv_image_latent, new_G))
+    result_image = create_alongside_images(images_to_save)
+    result_image.save(f'{base_dir}/{file_name}.jpg')
+
+
+def save_single_image(base_dir, image_latent, G, file_name):
+    image_to_save = get_image_from_w(image_latent, G)
+    image_to_save = Image.fromarray(image_to_save, mode='RGB')
+    image_to_save.save(f'{base_dir}/{file_name}.jpg')
+
+
+def create_alongside_images(images):
+    res = np.concatenate([np.array(image) for image in images], axis=1)
+    return Image.fromarray(res, mode='RGB')
+
+
+def get_image_from_w(w, G):
+    if len(w.size()) <= 2:
+        w = w.unsqueeze(0)
+    with torch.no_grad():
+        img = G.synthesis(w, noise_mode='const')
+        img = (img.permute(0, 2, 3, 1) * 127.5 + 128).clamp(0, 255).to(torch.uint8).detach().cpu().numpy()
+    return img[0]

stylegan_human/utils/models_utils.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+
+import pickle
+import functools
+import torch
+from pti.pti_configs import paths_config, global_config
+
+
+def toogle_grad(model, flag=True):
+    for p in model.parameters():
+        p.requires_grad = flag
+
+
+def load_tuned_G(run_id, type):
+    new_G_path = f'{paths_config.checkpoints_dir}/model_{run_id}_{type}.pt'
+    with open(new_G_path, 'rb') as f:
+        new_G = torch.load(f).to(global_config.device).eval()
+    new_G = new_G.float()
+    toogle_grad(new_G, False)
+    return new_G
+
+
+def load_old_G():
+    with open(paths_config.stylegan2_ada_shhq, 'rb') as f:
+        old_G = pickle.load(f)['G_ema'].to(global_config.device).eval()
+        old_G = old_G.float()
+    return old_G

stylegan_human/utils/util.py

+# Copyright (c) SenseTime Research. All rights reserved.
+
+import torch
+import cv2
+from torchvision import transforms
+import numpy as np
+import math
+
+
+def visual(output, out_path):
+    output = (output + 1)/2
+    output = torch.clamp(output, 0, 1)
+    if output.shape[1] == 1:
+        output = torch.cat([output, output, output], 1)
+    output = output[0].detach().cpu().permute(1,2,0).numpy()
+    output = (output*255).astype(np.uint8)
+    output = output[:,:,::-1]
+    cv2.imwrite(out_path, output)
+    
+    
+def get_lr(t, initial_lr, rampdown=0.25, rampup=0.05):
+    
+    lr_ramp = min(1, (1 - t) / rampdown)
+    lr_ramp = 0.5 - 0.5 * math.cos(lr_ramp * math.pi)
+    lr_ramp = lr_ramp * min(1, t / rampup)
+    return initial_lr * lr_ramp
+
+
+
+def latent_noise(latent, strength):
+    noise = torch.randn_like(latent) * strength
+
+    return latent + noise
+
+def noise_regularize_(noises):
+    loss = 0
+
+    for noise in noises:
+        size = noise.shape[2]
+
+        while True:
+            loss = (
+                loss
+                + (noise * torch.roll(noise, shifts=1, dims=3)).mean().pow(2)
+                + (noise * torch.roll(noise, shifts=1, dims=2)).mean().pow(2)
+            )
+
+            if size <= 8:
+                break
+
+            noise = noise.reshape([-1, 1, size // 2, 2, size // 2, 2])
+            noise = noise.mean([3, 5])
+            size //= 2
+
+    return loss
+
+
+def noise_normalize_(noises):
+    for noise in noises:
+        mean = noise.mean()
+        std = noise.std()
+
+        noise.data.add_(-mean).div_(std)
+        
+
+def tensor_to_numpy(x):
+    x = x[0].permute(1, 2, 0)
+    x = torch.clamp(x, -1 ,1)
+    x = (x+1) * 127.5
+    x = x.cpu().detach().numpy().astype(np.uint8)
+    return x
+
+def numpy_to_tensor(x):
+    x = (x / 255 - 0.5) * 2
+    x = torch.from_numpy(x).unsqueeze(0).permute(0, 3, 1, 2)
+    x = x.cuda().float()
+    return x
+
+def tensor_to_pil(x):
+    x = torch.clamp(x, -1 ,1)
+    x = (x+1) * 127.5
+    return transforms.ToPILImage()(x.squeeze_(0))
+

torch_utils/__init__.py

+# 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.
+
+# empty

torch_utils/custom_ops.py

+# 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.
+
+import glob
+import hashlib
+import importlib
+import os
+import re
+import shutil
+import uuid
+
+import torch
+import torch.utils.cpp_extension
+from torch.utils.file_baton import FileBaton
+
+#----------------------------------------------------------------------------
+# Global options.
+
+verbosity = 'brief' # Verbosity level: 'none', 'brief', 'full'
+
+#----------------------------------------------------------------------------
+# Internal helper funcs.
+
+def _find_compiler_bindir():
+    patterns = [
+        'C:/Program Files*/Microsoft Visual Studio/*/Professional/VC/Tools/MSVC/*/bin/Hostx64/x64',
+        'C:/Program Files*/Microsoft Visual Studio/*/BuildTools/VC/Tools/MSVC/*/bin/Hostx64/x64',
+        'C:/Program Files*/Microsoft Visual Studio/*/Community/VC/Tools/MSVC/*/bin/Hostx64/x64',
+        'C:/Program Files*/Microsoft Visual Studio */vc/bin',
+    ]
+    for pattern in patterns:
+        matches = sorted(glob.glob(pattern))
+        if len(matches):
+            return matches[-1]
+    return None
+
+#----------------------------------------------------------------------------
+
+def _get_mangled_gpu_name():
+    name = torch.cuda.get_device_name().lower()
+    out = []
+    for c in name:
+        if re.match('[a-z0-9_-]+', c):
+            out.append(c)
+        else:
+            out.append('-')
+    return ''.join(out)
+
+#----------------------------------------------------------------------------
+# Main entry point for compiling and loading C++/CUDA plugins.
+
+_cached_plugins = dict()
+
+def get_plugin(module_name, sources, headers=None, source_dir=None, **build_kwargs):
+    assert verbosity in ['none', 'brief', 'full']
+    if headers is None:
+        headers = []
+    if source_dir is not None:
+        sources = [os.path.join(source_dir, fname) for fname in sources]
+        headers = [os.path.join(source_dir, fname) for fname in headers]
+
+    # Already cached?
+    if module_name in _cached_plugins:
+        return _cached_plugins[module_name]
+
+    # Print status.
+    if verbosity == 'full':
+        print(f'Setting up PyTorch plugin "{module_name}"...')
+    elif verbosity == 'brief':
+        print(f'Setting up PyTorch plugin "{module_name}"... ', end='', flush=True)
+    verbose_build = (verbosity == 'full')
+
+    # Compile and load.
+    try: # pylint: disable=too-many-nested-blocks
+        # Make sure we can find the necessary compiler binaries.
+        if os.name == 'nt' and os.system("where cl.exe >nul 2>nul") != 0:
+            compiler_bindir = _find_compiler_bindir()
+            if compiler_bindir is None:
+                raise RuntimeError(f'Could not find MSVC/GCC/CLANG installation on this computer. Check _find_compiler_bindir() in "{__file__}".')
+            os.environ['PATH'] += ';' + compiler_bindir
+
+        # Some containers set TORCH_CUDA_ARCH_LIST to a list that can either
+        # break the build or unnecessarily restrict what's available to nvcc.
+        # Unset it to let nvcc decide based on what's available on the
+        # machine.
+        os.environ['TORCH_CUDA_ARCH_LIST'] = ''
+
+        # Incremental build md5sum trickery.  Copies all the input source files
+        # into a cached build directory under a combined md5 digest of the input
+        # source files.  Copying is done only if the combined digest has changed.
+        # This keeps input file timestamps and filenames the same as in previous
+        # extension builds, allowing for fast incremental rebuilds.
+        #
+        # This optimization is done only in case all the source files reside in
+        # a single directory (just for simplicity) and if the TORCH_EXTENSIONS_DIR
+        # environment variable is set (we take this as a signal that the user
+        # actually cares about this.)
+        #
+        # EDIT: We now do it regardless of TORCH_EXTENSIOS_DIR, in order to work
+        # around the *.cu dependency bug in ninja config.
+        #
+        all_source_files = sorted(sources + headers)
+        all_source_dirs = set(os.path.dirname(fname) for fname in all_source_files)
+        if len(all_source_dirs) == 1: # and ('TORCH_EXTENSIONS_DIR' in os.environ):
+
+            # Compute combined hash digest for all source files.
+            hash_md5 = hashlib.md5()
+            for src in all_source_files:
+                with open(src, 'rb') as f:
+                    hash_md5.update(f.read())
+
+            # Select cached build directory name.
+            source_digest = hash_md5.hexdigest()
+            build_top_dir = torch.utils.cpp_extension._get_build_directory(module_name, verbose=verbose_build) # pylint: disable=protected-access
+            cached_build_dir = os.path.join(build_top_dir, f'{source_digest}-{_get_mangled_gpu_name()}')
+
+            if not os.path.isdir(cached_build_dir):
+                tmpdir = f'{build_top_dir}/srctmp-{uuid.uuid4().hex}'
+                os.makedirs(tmpdir)
+                for src in all_source_files:
+                    shutil.copyfile(src, os.path.join(tmpdir, os.path.basename(src)))
+                try:
+                    os.replace(tmpdir, cached_build_dir) # atomic
+                except OSError:
+                    # source directory already exists, delete tmpdir and its contents.
+                    shutil.rmtree(tmpdir)
+                    if not os.path.isdir(cached_build_dir): raise
+
+            # Compile.
+            cached_sources = [os.path.join(cached_build_dir, os.path.basename(fname)) for fname in sources]
+            torch.utils.cpp_extension.load(name=module_name, build_directory=cached_build_dir,
+                verbose=verbose_build, sources=cached_sources, **build_kwargs)
+        else:
+            torch.utils.cpp_extension.load(name=module_name, verbose=verbose_build, sources=sources, **build_kwargs)
+
+        # Load.
+        module = importlib.import_module(module_name)
+
+    except:
+        if verbosity == 'brief':
+            print('Failed!')
+        raise
+
+    # Print status and add to cache dict.
+    if verbosity == 'full':
+        print(f'Done setting up PyTorch plugin "{module_name}".')
+    elif verbosity == 'brief':
+        print('Done.')
+    _cached_plugins[module_name] = module
+    return module
+
+#----------------------------------------------------------------------------

torch_utils/misc.py

+# 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.
+
+import re
+import contextlib
+import numpy as np
+import torch
+import warnings
+import dnnlib
+
+#----------------------------------------------------------------------------
+# Cached construction of constant tensors. Avoids CPU=>GPU copy when the
+# same constant is used multiple times.
+
+_constant_cache = dict()
+
+def constant(value, shape=None, dtype=None, device=None, memory_format=None):
+    value = np.asarray(value)
+    if shape is not None:
+        shape = tuple(shape)
+    if dtype is None:
+        dtype = torch.get_default_dtype()
+    if device is None:
+        device = torch.device('cpu')
+    if memory_format is None:
+        memory_format = torch.contiguous_format
+
+    key = (value.shape, value.dtype, value.tobytes(), shape, dtype, device, memory_format)
+    tensor = _constant_cache.get(key, None)
+    if tensor is None:
+        tensor = torch.as_tensor(value.copy(), dtype=dtype, device=device)
+        if shape is not None:
+            tensor, _ = torch.broadcast_tensors(tensor, torch.empty(shape))
+        tensor = tensor.contiguous(memory_format=memory_format)
+        _constant_cache[key] = tensor
+    return tensor
+
+#----------------------------------------------------------------------------
+# Replace NaN/Inf with specified numerical values.
+
+try:
+    nan_to_num = torch.nan_to_num # 1.8.0a0
+except AttributeError:
+    def nan_to_num(input, nan=0.0, posinf=None, neginf=None, *, out=None): # pylint: disable=redefined-builtin
+        assert isinstance(input, torch.Tensor)
+        if posinf is None:
+            posinf = torch.finfo(input.dtype).max
+        if neginf is None:
+            neginf = torch.finfo(input.dtype).min
+        assert nan == 0
+        return torch.clamp(input.unsqueeze(0).nansum(0), min=neginf, max=posinf, out=out)
+
+#----------------------------------------------------------------------------
+# Symbolic assert.
+
+try:
+    symbolic_assert = torch._assert # 1.8.0a0 # pylint: disable=protected-access
+except AttributeError:
+    symbolic_assert = torch.Assert # 1.7.0
+
+#----------------------------------------------------------------------------
+# Context manager to temporarily suppress known warnings in torch.jit.trace().
+# Note: Cannot use catch_warnings because of https://bugs.python.org/issue29672
+
+@contextlib.contextmanager
+def suppress_tracer_warnings():
+    flt = ('ignore', None, torch.jit.TracerWarning, None, 0)
+    warnings.filters.insert(0, flt)
+    yield
+    warnings.filters.remove(flt)
+
+#----------------------------------------------------------------------------
+# Assert that the shape of a tensor matches the given list of integers.
+# None indicates that the size of a dimension is allowed to vary.
+# Performs symbolic assertion when used in torch.jit.trace().
+
+def assert_shape(tensor, ref_shape):
+    if tensor.ndim != len(ref_shape):
+        raise AssertionError(f'Wrong number of dimensions: got {tensor.ndim}, expected {len(ref_shape)}')
+    for idx, (size, ref_size) in enumerate(zip(tensor.shape, ref_shape)):
+        if ref_size is None:
+            pass
+        elif isinstance(ref_size, torch.Tensor):
+            with suppress_tracer_warnings(): # as_tensor results are registered as constants
+                symbolic_assert(torch.equal(torch.as_tensor(size), ref_size), f'Wrong size for dimension {idx}')
+        elif isinstance(size, torch.Tensor):
+            with suppress_tracer_warnings(): # as_tensor results are registered as constants
+                symbolic_assert(torch.equal(size, torch.as_tensor(ref_size)), f'Wrong size for dimension {idx}: expected {ref_size}')
+        elif size != ref_size:
+            raise AssertionError(f'Wrong size for dimension {idx}: got {size}, expected {ref_size}')
+
+#----------------------------------------------------------------------------
+# Function decorator that calls torch.autograd.profiler.record_function().
+
+def profiled_function(fn):
+    def decorator(*args, **kwargs):
+        with torch.autograd.profiler.record_function(fn.__name__):
+            return fn(*args, **kwargs)
+    decorator.__name__ = fn.__name__
+    return decorator
+
+#----------------------------------------------------------------------------
+# Sampler for torch.utils.data.DataLoader that loops over the dataset
+# indefinitely, shuffling items as it goes.
+
+class InfiniteSampler(torch.utils.data.Sampler):
+    def __init__(self, dataset, rank=0, num_replicas=1, shuffle=True, seed=0, window_size=0.5):
+        assert len(dataset) > 0
+        assert num_replicas > 0
+        assert 0 <= rank < num_replicas
+        assert 0 <= window_size <= 1
+        super().__init__(dataset)
+        self.dataset = dataset
+        self.rank = rank
+        self.num_replicas = num_replicas
+        self.shuffle = shuffle
+        self.seed = seed
+        self.window_size = window_size
+
+    def __iter__(self):
+        order = np.arange(len(self.dataset))
+        rnd = None
+        window = 0
+        if self.shuffle:
+            rnd = np.random.RandomState(self.seed)
+            rnd.shuffle(order)
+            window = int(np.rint(order.size * self.window_size))
+
+        idx = 0
+        while True:
+            i = idx % order.size
+            if idx % self.num_replicas == self.rank:
+                yield order[i]
+            if window >= 2:
+                j = (i - rnd.randint(window)) % order.size
+                order[i], order[j] = order[j], order[i]
+            idx += 1
+
+#----------------------------------------------------------------------------
+# Utilities for operating with torch.nn.Module parameters and buffers.
+
+def params_and_buffers(module):
+    assert isinstance(module, torch.nn.Module)
+    return list(module.parameters()) + list(module.buffers())
+
+def named_params_and_buffers(module):
+    assert isinstance(module, torch.nn.Module)
+    return list(module.named_parameters()) + list(module.named_buffers())
+
+def copy_params_and_buffers(src_module, dst_module, require_all=False):
+    assert isinstance(src_module, torch.nn.Module)
+    assert isinstance(dst_module, torch.nn.Module)
+    src_tensors = dict(named_params_and_buffers(src_module))
+    for name, tensor in named_params_and_buffers(dst_module):
+        assert (name in src_tensors) or (not require_all)
+        if name in src_tensors:
+            tensor.copy_(src_tensors[name].detach()).requires_grad_(tensor.requires_grad)
+
+#----------------------------------------------------------------------------
+# Context manager for easily enabling/disabling DistributedDataParallel
+# synchronization.
+
+@contextlib.contextmanager
+def ddp_sync(module, sync):
+    assert isinstance(module, torch.nn.Module)
+    if sync or not isinstance(module, torch.nn.parallel.DistributedDataParallel):
+        yield
+    else:
+        with module.no_sync():
+            yield
+
+#----------------------------------------------------------------------------
+# Check DistributedDataParallel consistency across processes.
+
+def check_ddp_consistency(module, ignore_regex=None):
+    assert isinstance(module, torch.nn.Module)
+    for name, tensor in named_params_and_buffers(module):
+        fullname = type(module).__name__ + '.' + name
+        if ignore_regex is not None and re.fullmatch(ignore_regex, fullname):
+            continue
+        tensor = tensor.detach()
+        if tensor.is_floating_point():
+            tensor = nan_to_num(tensor)
+        other = tensor.clone()
+        torch.distributed.broadcast(tensor=other, src=0)
+        assert (tensor == other).all(), fullname
+
+#----------------------------------------------------------------------------
+# Print summary table of module hierarchy.
+
+def print_module_summary(module, inputs, max_nesting=3, skip_redundant=True):
+    assert isinstance(module, torch.nn.Module)
+    assert not isinstance(module, torch.jit.ScriptModule)
+    assert isinstance(inputs, (tuple, list))
+
+    # Register hooks.
+    entries = []
+    nesting = [0]
+    def pre_hook(_mod, _inputs):
+        nesting[0] += 1
+    def post_hook(mod, _inputs, outputs):
+        nesting[0] -= 1
+        if nesting[0] <= max_nesting:
+            outputs = list(outputs) if isinstance(outputs, (tuple, list)) else [outputs]
+            outputs = [t for t in outputs if isinstance(t, torch.Tensor)]
+            entries.append(dnnlib.EasyDict(mod=mod, outputs=outputs))
+    hooks = [mod.register_forward_pre_hook(pre_hook) for mod in module.modules()]
+    hooks += [mod.register_forward_hook(post_hook) for mod in module.modules()]
+
+    # Run module.
+    outputs = module(*inputs)
+    for hook in hooks:
+        hook.remove()
+
+    # Identify unique outputs, parameters, and buffers.
+    tensors_seen = set()
+    for e in entries:
+        e.unique_params = [t for t in e.mod.parameters() if id(t) not in tensors_seen]
+        e.unique_buffers = [t for t in e.mod.buffers() if id(t) not in tensors_seen]
+        e.unique_outputs = [t for t in e.outputs if id(t) not in tensors_seen]
+        tensors_seen |= {id(t) for t in e.unique_params + e.unique_buffers + e.unique_outputs}
+
+    # Filter out redundant entries.
+    if skip_redundant:
+        entries = [e for e in entries if len(e.unique_params) or len(e.unique_buffers) or len(e.unique_outputs)]
+
+    # Construct table.
+    rows = [[type(module).__name__, 'Parameters', 'Buffers', 'Output shape', 'Datatype']]
+    rows += [['---'] * len(rows[0])]
+    param_total = 0
+    buffer_total = 0
+    submodule_names = {mod: name for name, mod in module.named_modules()}
+    for e in entries:
+        name = '<top-level>' if e.mod is module else submodule_names[e.mod]
+        param_size = sum(t.numel() for t in e.unique_params)
+        buffer_size = sum(t.numel() for t in e.unique_buffers)
+        output_shapes = [str(list(t.shape)) for t in e.outputs]
+        output_dtypes = [str(t.dtype).split('.')[-1] for t in e.outputs]
+        rows += [[
+            name + (':0' if len(e.outputs) >= 2 else ''),
+            str(param_size) if param_size else '-',
+            str(buffer_size) if buffer_size else '-',
+            (output_shapes + ['-'])[0],
+            (output_dtypes + ['-'])[0],
+        ]]
+        for idx in range(1, len(e.outputs)):
+            rows += [[name + f':{idx}', '-', '-', output_shapes[idx], output_dtypes[idx]]]
+        param_total += param_size
+        buffer_total += buffer_size
+    rows += [['---'] * len(rows[0])]
+    rows += [['Total', str(param_total), str(buffer_total), '-', '-']]
+
+    # Print table.
+    widths = [max(len(cell) for cell in column) for column in zip(*rows)]
+    print()
+    for row in rows:
+        print('  '.join(cell + ' ' * (width - len(cell)) for cell, width in zip(row, widths)))
+    print()
+    return outputs
+
+#----------------------------------------------------------------------------

torch_utils/ops/__init__.py

+# 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.
+
+# empty