from math import pi
import torch
from torch import nn
from radionets.architecture.activation import GeneralReLU
from radionets.architecture.blocks import SRBlock
__all__ = [
"SRResNet",
"SRResNet18",
"SRResNet34",
"SRResNet34_unc",
"SRResNet34_unc_no_grad",
]
[docs]
class SRResNet(nn.Module):
def __init__(self):
super().__init__()
self.channels = 64
self.preBlock = nn.Sequential(
nn.Conv2d(
in_channels=2,
out_channels=self.channels,
kernel_size=9,
stride=1,
padding=4,
groups=2,
),
nn.PReLU(),
)
self.postBlock = nn.Sequential(
nn.Conv2d(
in_channels=self.channels,
out_channels=self.channels,
kernel_size=3,
stride=1,
padding=1,
bias=False,
),
nn.BatchNorm2d(self.channels),
)
self.final = nn.Sequential(
nn.Conv2d(
in_channels=self.channels,
out_channels=2,
kernel_size=9,
stride=1,
padding=4,
groups=2,
),
)
self.hardtanh = nn.Hardtanh(-pi, pi)
self.relu = nn.ReLU()
def _create_blocks(self, n_blocks):
blocks = []
for _ in range(n_blocks):
blocks.append(SRBlock(64, 64))
self.blocks = nn.Sequential(*blocks)
[docs]
def forward(self, x):
x = self.preBlock(x)
x = x + self.postBlock(self.blocks(x))
x = self.final(x)
x0 = self.relu(x[:, 0].unsqueeze(1))
x1 = self.hardtanh(x[:, 1].unsqueeze(1))
return torch.cat([x0, x1], dim=1)
[docs]
class SRResNet18(SRResNet):
def __init__(self):
super().__init__()
# Create 8 ResBlocks to build a SRResNet18
self._create_blocks(8)
[docs]
class SRResNet34(SRResNet):
def __init__(self):
super().__init__()
# Create 16 ResBlocks to build a SRResNet34
self._create_blocks(16)
self.postBlock = nn.Sequential(
nn.Conv2d(
in_channels=self.channels,
out_channels=self.channels,
kernel_size=3,
stride=1,
padding=1,
bias=False,
),
nn.InstanceNorm2d(self.channels),
)
[docs]
class SRResNet34_unc(SRResNet):
def __init__(self):
super().__init__()
self._create_blocks(16)
self.postBlock = nn.Sequential(
nn.Conv2d(
in_channels=self.channels,
out_channels=self.channels,
kernel_size=3,
stride=1,
padding=1,
bias=False,
),
nn.InstanceNorm2d(self.channels),
)
self.elu = GeneralReLU(sub=-1e-10)
[docs]
def forward(self, x):
s = x.shape[-1]
x = self.preBlock(x)
x = x + self.postBlock(self.blocks(x))
x = self.final(x)
x0 = x[:, 0].reshape(-1, 1, s // 2 + 1, s)
x1 = x[:, 1].reshape(-1, 1, s // 2 + 1, s)
x3 = x[:, 2].reshape(-1, 1, s // 2 + 1, s)
x3 = self.elu(x3)
x4 = x[:, 3].reshape(-1, 1, s // 2 + 1, s)
x4 = self.elu(x4)
return torch.cat([x0, x3, x1, x4], dim=1)
[docs]
class SRResNet34_unc_no_grad(SRResNet34_unc):
def __init__(self):
super().__init__()
[docs]
def forward(self, x):
s = x.shape[-1]
x = self.preBlock(x)
x = x + self.postBlock(self.blocks(x))
x = self.final(x)
x0 = x[:, 0].reshape(-1, 1, s // 2 + 1, s)
x1 = x[:, 1].reshape(-1, 1, s // 2 + 1, s)
x3 = x[:, 2].reshape(-1, 1, s // 2 + 1, s)
with torch.no_grad():
x3 = self.elu(x3)
x4 = x[:, 3].reshape(-1, 1, s // 2 + 1, s)
with torch.no_grad():
x4 = self.elu(x4)
return torch.cat([x0, x3, x1, x4], dim=1)
