forked from mrq/DL-Art-School
84 lines
3.1 KiB
Python
84 lines
3.1 KiB
Python
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import torch.nn as nn
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import torch.nn.functional as F
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from models.archs.RRDBNet_arch import RRDB
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from models.archs.arch_util import make_layer, default_init_weights, ConvGnSilu, ConvGnLelu
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from utils.util import checkpoint
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class MultiLevelRRDB(nn.Module):
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def __init__(self, nf, gc, levels):
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super().__init__()
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self.levels = levels
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self.level_rrdbs = nn.ModuleList([RRDB(nf, growth_channels=gc) for i in range(levels)])
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# Trunks should be fed in in order HR->LR
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def forward(self, trunk):
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for i in reversed(range(self.levels)):
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lvl_scale = (2**i)
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lvl_res = self.level_rrdbs[i](F.interpolate(trunk, scale_factor=1/lvl_scale, mode="area"), return_residual=True)
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trunk = trunk + F.interpolate(lvl_res, scale_factor=lvl_scale, mode="nearest")
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return trunk
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class MultiResRRDBNet(nn.Module):
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def __init__(self,
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in_channels,
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out_channels,
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mid_channels=64,
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l1_blocks=3,
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l2_blocks=4,
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l3_blocks=6,
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growth_channels=32,
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scale=4,
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):
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super().__init__()
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self.scale = scale
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self.in_channels = in_channels
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self.conv_first = nn.Conv2d(in_channels, mid_channels, 7, stride=1, padding=3)
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self.l3_blocks = nn.ModuleList([MultiLevelRRDB(mid_channels, growth_channels, 3) for _ in range(l1_blocks)])
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self.l2_blocks = nn.ModuleList([MultiLevelRRDB(mid_channels, growth_channels, 2) for _ in range(l2_blocks)])
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self.l1_blocks = nn.ModuleList([MultiLevelRRDB(mid_channels, growth_channels, 1) for _ in range(l3_blocks)])
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self.block_levels = [self.l3_blocks, self.l2_blocks, self.l1_blocks]
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self.conv_body = nn.Conv2d(mid_channels, mid_channels, 3, 1, 1)
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# upsample
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self.conv_up1 = nn.Conv2d(mid_channels, mid_channels, 3, 1, 1)
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self.conv_up2 = nn.Conv2d(mid_channels, mid_channels, 3, 1, 1)
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self.conv_hr = nn.Conv2d(mid_channels, mid_channels, 3, 1, 1)
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self.conv_last = nn.Conv2d(mid_channels, out_channels, 3, 1, 1)
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self.lrelu = nn.LeakyReLU(negative_slope=0.2, inplace=True)
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for m in [
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self.conv_first, self.conv_first, self.conv_body, self.conv_up1,
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self.conv_up2, self.conv_hr, self.conv_last
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]:
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if m is not None:
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default_init_weights(m, 0.1)
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def forward(self, x):
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trunk = self.conv_first(x)
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for block_set in self.block_levels:
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for block in block_set:
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trunk = checkpoint(block, trunk)
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body_feat = self.conv_body(trunk)
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feat = trunk + body_feat
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# upsample
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out = self.lrelu(
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self.conv_up1(F.interpolate(feat, scale_factor=2, mode='nearest')))
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if self.scale == 4:
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out = self.lrelu(
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self.conv_up2(F.interpolate(out, scale_factor=2, mode='nearest')))
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else:
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out = self.lrelu(self.conv_up2(out))
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out = self.conv_last(self.lrelu(self.conv_hr(out)))
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return out
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def visual_dbg(self, step, path):
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pass
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