From 495ffc4777522e40941753e3b1b79c02f84b25b4 Mon Sep 17 00:00:00 2001
From: Grafting Rayman <156515434+GraftingRayman@users.noreply.github.com>
Date: Fri, 17 Jan 2025 11:00:30 +0000
Subject: Add files via upload

---
 r_basicsr/archs/dfdnet_util.py | 162 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 r_basicsr/archs/dfdnet_util.py

(limited to 'r_basicsr/archs/dfdnet_util.py')

diff --git a/r_basicsr/archs/dfdnet_util.py b/r_basicsr/archs/dfdnet_util.py
new file mode 100644
index 0000000..411e683
--- /dev/null
+++ b/r_basicsr/archs/dfdnet_util.py
@@ -0,0 +1,162 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from torch.autograd import Function
+from torch.nn.utils.spectral_norm import spectral_norm
+
+
+class BlurFunctionBackward(Function):
+
+    @staticmethod
+    def forward(ctx, grad_output, kernel, kernel_flip):
+        ctx.save_for_backward(kernel, kernel_flip)
+        grad_input = F.conv2d(grad_output, kernel_flip, padding=1, groups=grad_output.shape[1])
+        return grad_input
+
+    @staticmethod
+    def backward(ctx, gradgrad_output):
+        kernel, _ = ctx.saved_tensors
+        grad_input = F.conv2d(gradgrad_output, kernel, padding=1, groups=gradgrad_output.shape[1])
+        return grad_input, None, None
+
+
+class BlurFunction(Function):
+
+    @staticmethod
+    def forward(ctx, x, kernel, kernel_flip):
+        ctx.save_for_backward(kernel, kernel_flip)
+        output = F.conv2d(x, kernel, padding=1, groups=x.shape[1])
+        return output
+
+    @staticmethod
+    def backward(ctx, grad_output):
+        kernel, kernel_flip = ctx.saved_tensors
+        grad_input = BlurFunctionBackward.apply(grad_output, kernel, kernel_flip)
+        return grad_input, None, None
+
+
+blur = BlurFunction.apply
+
+
+class Blur(nn.Module):
+
+    def __init__(self, channel):
+        super().__init__()
+        kernel = torch.tensor([[1, 2, 1], [2, 4, 2], [1, 2, 1]], dtype=torch.float32)
+        kernel = kernel.view(1, 1, 3, 3)
+        kernel = kernel / kernel.sum()
+        kernel_flip = torch.flip(kernel, [2, 3])
+
+        self.kernel = kernel.repeat(channel, 1, 1, 1)
+        self.kernel_flip = kernel_flip.repeat(channel, 1, 1, 1)
+
+    def forward(self, x):
+        return blur(x, self.kernel.type_as(x), self.kernel_flip.type_as(x))
+
+
+def calc_mean_std(feat, eps=1e-5):
+    """Calculate mean and std for adaptive_instance_normalization.
+
+    Args:
+        feat (Tensor): 4D tensor.
+        eps (float): A small value added to the variance to avoid
+            divide-by-zero. Default: 1e-5.
+    """
+    size = feat.size()
+    assert len(size) == 4, 'The input feature should be 4D tensor.'
+    n, c = size[:2]
+    feat_var = feat.view(n, c, -1).var(dim=2) + eps
+    feat_std = feat_var.sqrt().view(n, c, 1, 1)
+    feat_mean = feat.view(n, c, -1).mean(dim=2).view(n, c, 1, 1)
+    return feat_mean, feat_std
+
+
+def adaptive_instance_normalization(content_feat, style_feat):
+    """Adaptive instance normalization.
+
+    Adjust the reference features to have the similar color and illuminations
+    as those in the degradate features.
+
+    Args:
+        content_feat (Tensor): The reference feature.
+        style_feat (Tensor): The degradate features.
+    """
+    size = content_feat.size()
+    style_mean, style_std = calc_mean_std(style_feat)
+    content_mean, content_std = calc_mean_std(content_feat)
+    normalized_feat = (content_feat - content_mean.expand(size)) / content_std.expand(size)
+    return normalized_feat * style_std.expand(size) + style_mean.expand(size)
+
+
+def AttentionBlock(in_channel):
+    return nn.Sequential(
+        spectral_norm(nn.Conv2d(in_channel, in_channel, 3, 1, 1)), nn.LeakyReLU(0.2, True),
+        spectral_norm(nn.Conv2d(in_channel, in_channel, 3, 1, 1)))
+
+
+def conv_block(in_channels, out_channels, kernel_size=3, stride=1, dilation=1, bias=True):
+    """Conv block used in MSDilationBlock."""
+
+    return nn.Sequential(
+        spectral_norm(
+            nn.Conv2d(
+                in_channels,
+                out_channels,
+                kernel_size=kernel_size,
+                stride=stride,
+                dilation=dilation,
+                padding=((kernel_size - 1) // 2) * dilation,
+                bias=bias)),
+        nn.LeakyReLU(0.2),
+        spectral_norm(
+            nn.Conv2d(
+                out_channels,
+                out_channels,
+                kernel_size=kernel_size,
+                stride=stride,
+                dilation=dilation,
+                padding=((kernel_size - 1) // 2) * dilation,
+                bias=bias)),
+    )
+
+
+class MSDilationBlock(nn.Module):
+    """Multi-scale dilation block."""
+
+    def __init__(self, in_channels, kernel_size=3, dilation=(1, 1, 1, 1), bias=True):
+        super(MSDilationBlock, self).__init__()
+
+        self.conv_blocks = nn.ModuleList()
+        for i in range(4):
+            self.conv_blocks.append(conv_block(in_channels, in_channels, kernel_size, dilation=dilation[i], bias=bias))
+        self.conv_fusion = spectral_norm(
+            nn.Conv2d(
+                in_channels * 4,
+                in_channels,
+                kernel_size=kernel_size,
+                stride=1,
+                padding=(kernel_size - 1) // 2,
+                bias=bias))
+
+    def forward(self, x):
+        out = []
+        for i in range(4):
+            out.append(self.conv_blocks[i](x))
+        out = torch.cat(out, 1)
+        out = self.conv_fusion(out) + x
+        return out
+
+
+class UpResBlock(nn.Module):
+
+    def __init__(self, in_channel):
+        super(UpResBlock, self).__init__()
+        self.body = nn.Sequential(
+            nn.Conv2d(in_channel, in_channel, 3, 1, 1),
+            nn.LeakyReLU(0.2, True),
+            nn.Conv2d(in_channel, in_channel, 3, 1, 1),
+        )
+
+    def forward(self, x):
+        out = x + self.body(x)
+        return out
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