| import functools
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| import torch
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| import torch.nn as nn
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| import torch.nn.functional as F
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|
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|
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| def make_layer(block, n_layers):
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| layers = []
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| for _ in range(n_layers):
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| layers.append(block())
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| return nn.Sequential(*layers)
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|
|
|
|
| class ResidualDenseBlock_5C(nn.Module):
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| def __init__(self, nf=64, gc=32, bias=True):
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| super(ResidualDenseBlock_5C, self).__init__()
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|
|
| self.conv1 = nn.Conv2d(nf, gc, 3, 1, 1, bias=bias)
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| self.conv2 = nn.Conv2d(nf + gc, gc, 3, 1, 1, bias=bias)
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| self.conv3 = nn.Conv2d(nf + 2 * gc, gc, 3, 1, 1, bias=bias)
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| self.conv4 = nn.Conv2d(nf + 3 * gc, gc, 3, 1, 1, bias=bias)
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| self.conv5 = nn.Conv2d(nf + 4 * gc, nf, 3, 1, 1, bias=bias)
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| self.lrelu = nn.LeakyReLU(negative_slope=0.2, inplace=True)
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|
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| def forward(self, x):
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| x1 = self.lrelu(self.conv1(x))
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| x2 = self.lrelu(self.conv2(torch.cat((x, x1), 1)))
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| x3 = self.lrelu(self.conv3(torch.cat((x, x1, x2), 1)))
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| x4 = self.lrelu(self.conv4(torch.cat((x, x1, x2, x3), 1)))
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| x5 = self.conv5(torch.cat((x, x1, x2, x3, x4), 1))
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| return x5 * 0.2 + x
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|
|
|
|
| class RRDB(nn.Module):
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| '''Residual in Residual Dense Block'''
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|
|
| def __init__(self, nf, gc=32):
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| super(RRDB, self).__init__()
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| self.RDB1 = ResidualDenseBlock_5C(nf, gc)
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| self.RDB2 = ResidualDenseBlock_5C(nf, gc)
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| self.RDB3 = ResidualDenseBlock_5C(nf, gc)
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|
|
| def forward(self, x):
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| out = self.RDB1(x)
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| out = self.RDB2(out)
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| out = self.RDB3(out)
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| return out * 0.2 + x
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|
|
|
|
| class RRDBNet(nn.Module):
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| def __init__(self, in_nc, out_nc, nf, nb, gc=32):
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| super(RRDBNet, self).__init__()
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| RRDB_block_f = functools.partial(RRDB, nf=nf, gc=gc)
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|
|
| self.conv_first = nn.Conv2d(in_nc, nf, 3, 1, 1, bias=True)
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| self.RRDB_trunk = make_layer(RRDB_block_f, nb)
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| self.trunk_conv = nn.Conv2d(nf, nf, 3, 1, 1, bias=True)
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|
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| self.upconv1 = nn.Conv2d(nf, nf, 3, 1, 1, bias=True)
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| self.upconv2 = nn.Conv2d(nf, nf, 3, 1, 1, bias=True)
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| self.HRconv = nn.Conv2d(nf, nf, 3, 1, 1, bias=True)
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| self.conv_last = nn.Conv2d(nf, out_nc, 3, 1, 1, bias=True)
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|
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| self.lrelu = nn.LeakyReLU(negative_slope=0.2, inplace=True)
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|
|
| def forward(self, x):
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| fea = self.conv_first(x)
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| trunk = self.trunk_conv(self.RRDB_trunk(fea))
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| fea = fea + trunk
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|
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| fea = self.lrelu(self.upconv1(F.interpolate(fea, scale_factor=2, mode='nearest')))
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| fea = self.lrelu(self.upconv2(F.interpolate(fea, scale_factor=2, mode='nearest')))
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| out = self.conv_last(self.lrelu(self.HRconv(fea)))
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|
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| return out
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|
|
