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import torch
import torch.nn as nn
architecture_config = [
(7, 64, 2, 3),
"M",
(3, 192, 1, 1),
"M",
(1, 128, 1, 0),
(3, 256, 1, 1),
(1, 256, 1, 0),
(3, 512, 1, 1),
"M",
[(1, 256, 1, 0), (3, 512, 1, 1), 4],
(1, 512, 1, 0),
(3, 1024, 1, 1),
"M",
[(1, 512, 1, 0), (3, 1024, 1, 1), 2],
(3, 1024, 1, 1),
(3, 1024, 2, 1),
(3, 1024, 1, 1),
(3, 1024, 1, 1),
]
class CNNBlock(nn.Module):
def __init__(self, in_channels, out_channels, **kwargs):
super(CNNBlock, self).__init__()
self.conv = nn.Conv2d(in_channels, out_channels, bias=False, **kwargs)
self.batchnorm = nn.BatchNorm2d(out_channels)
self.leakyrelu = nn.LeakyReLU(0.1)
def forward(self, x):
return self.leakyrelu(self.batchnorm(self.conv(x)))
class Yolo_V1(nn.Module):
def __init__(self, in_channels=3, **kwargs):
super(Yolo_V1, self).__init__()
self.architecture = architecture_config
self.in_channels = in_channels
self.darknet = self._create_conv_layers(self.architecture)
self.fcs = self._create_fcs(**kwargs)
def forward(self, x):
x = self.darknet(x)
return self.fcs(torch.flatten(x, start_dim=1))
def _create_conv_layers(self, architecture):
layers = []
in_channels = self.in_channels
for x in architecture:
if type(x) == tuple:
layers += [
CNNBlock(
in_channels, x[1], kernel_size=x[0], stride=x[2], padding=x[3],
)
]
in_channels = x[1]
elif type(x) == str:
layers += [nn.MaxPool2d(kernel_size=(2, 2), stride=(2, 2))]
elif type(x) == list:
conv1 = x[0]
conv2 = x[1]
num_repeats = x[2]
for _ in range(num_repeats):
layers += [
CNNBlock(
in_channels,
conv1[1],
kernel_size=conv1[0],
stride=conv1[2],
padding=conv1[3],
)
]
layers += [
CNNBlock(
conv1[1],
conv2[1],
kernel_size=conv2[0],
stride=conv2[2],
padding=conv2[3],
)
]
in_channels = conv2[1]
return nn.Sequential(*layers)
def _create_fcs(self, split_size, num_boxes, num_classes):
S, B, C = split_size, num_boxes, num_classes
return nn.Sequential(
nn.Flatten(),
nn.Linear(1024 * S * S, 496),
nn.Dropout(0.0),
nn.LeakyReLU(0.1),
nn.Linear(496, S * S * (C + B * 5)),
) |