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import torch
import torch.nn as nn
import torch.nn.functional as F
class ConvBNAct(nn.Module):
def __init__(self,
in_channels,
out_channels,
kernel_size,
stride,
groups=1,
use_act=True):
super().__init__()
self.use_act = use_act
self.conv = nn.Conv2d(
in_channels,
out_channels,
kernel_size,
stride,
padding=(kernel_size - 1) // 2,
groups=groups,
bias=False,
)
self.bn = nn.BatchNorm2d(out_channels)
if self.use_act:
self.act = nn.ReLU()
def forward(self, x):
x = self.conv(x)
x = self.bn(x)
if self.use_act:
x = self.act(x)
return x
class ESEModule(nn.Module):
def __init__(self, channels):
super().__init__()
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.conv = nn.Conv2d(
in_channels=channels,
out_channels=channels,
kernel_size=1,
stride=1,
padding=0,
)
self.sigmoid = nn.Sigmoid()
def forward(self, x):
identity = x
x = self.avg_pool(x)
x = self.conv(x)
x = self.sigmoid(x)
return x * identity
class HG_Block(nn.Module):
def __init__(
self,
in_channels,
mid_channels,
out_channels,
layer_num,
identity=False,
):
super().__init__()
self.identity = identity
self.layers = nn.ModuleList()
self.layers.append(
ConvBNAct(
in_channels=in_channels,
out_channels=mid_channels,
kernel_size=3,
stride=1,
))
for _ in range(layer_num - 1):
self.layers.append(
ConvBNAct(
in_channels=mid_channels,
out_channels=mid_channels,
kernel_size=3,
stride=1,
))
# feature aggregation
total_channels = in_channels + layer_num * mid_channels
self.aggregation_conv = ConvBNAct(
in_channels=total_channels,
out_channels=out_channels,
kernel_size=1,
stride=1,
)
self.att = ESEModule(out_channels)
def forward(self, x):
identity = x
output = []
output.append(x)
for layer in self.layers:
x = layer(x)
output.append(x)
x = torch.cat(output, dim=1)
x = self.aggregation_conv(x)
x = self.att(x)
if self.identity:
x += identity
return x
class HG_Stage(nn.Module):
def __init__(
self,
in_channels,
mid_channels,
out_channels,
block_num,
layer_num,
downsample=True,
stride=[2, 1],
):
super().__init__()
self.downsample = downsample
if downsample:
self.downsample = ConvBNAct(
in_channels=in_channels,
out_channels=in_channels,
kernel_size=3,
stride=stride,
groups=in_channels,
use_act=False,
)
blocks_list = []
blocks_list.append(
HG_Block(in_channels,
mid_channels,
out_channels,
layer_num,
identity=False))
for _ in range(block_num - 1):
blocks_list.append(
HG_Block(out_channels,
mid_channels,
out_channels,
layer_num,
identity=True))
self.blocks = nn.Sequential(*blocks_list)
def forward(self, x):
if self.downsample:
x = self.downsample(x)
x = self.blocks(x)
return x
class PPHGNet(nn.Module):
"""
PPHGNet
Args:
stem_channels: list. Stem channel list of PPHGNet.
stage_config: dict. The configuration of each stage of PPHGNet. such as the number of channels, stride, etc.
layer_num: int. Number of layers of HG_Block.
use_last_conv: boolean. Whether to use a 1x1 convolutional layer before the classification layer.
class_expand: int=2048. Number of channels for the last 1x1 convolutional layer.
dropout_prob: float. Parameters of dropout, 0.0 means dropout is not used.
class_num: int=1000. The number of classes.
Returns:
model: nn.Layer. Specific PPHGNet model depends on args.
"""
def __init__(
self,
stem_channels,
stage_config,
layer_num,
in_channels=3,
det=False,
out_indices=None,
):
super().__init__()
self.det = det
self.out_indices = out_indices if out_indices is not None else [
0, 1, 2, 3
]
# stem
stem_channels.insert(0, in_channels)
self.stem = nn.Sequential(*[
ConvBNAct(
in_channels=stem_channels[i],
out_channels=stem_channels[i + 1],
kernel_size=3,
stride=2 if i == 0 else 1,
) for i in range(len(stem_channels) - 1)
])
if self.det:
self.pool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1)
# stages
self.stages = nn.ModuleList()
self.out_channels = []
for block_id, k in enumerate(stage_config):
(
in_channels,
mid_channels,
out_channels,
block_num,
downsample,
stride,
) = stage_config[k]
self.stages.append(
HG_Stage(
in_channels,
mid_channels,
out_channels,
block_num,
layer_num,
downsample,
stride,
))
if block_id in self.out_indices:
self.out_channels.append(out_channels)
if not self.det:
self.out_channels = stage_config['stage4'][2]
self._init_weights()
def _init_weights(self):
for m in self.modules():
if isinstance(m, nn.Conv2d):
nn.init.kaiming_normal_(m.weight)
elif isinstance(m, nn.BatchNorm2d):
nn.init.ones_(m.weight)
nn.init.zeros_(m.bias)
elif isinstance(m, nn.Linear):
nn.init.zeros_(m.bias)
def forward(self, x):
x = self.stem(x)
if self.det:
x = self.pool(x)
out = []
for i, stage in enumerate(self.stages):
x = stage(x)
if self.det and i in self.out_indices:
out.append(x)
if self.det:
return out
if self.training:
x = F.adaptive_avg_pool2d(x, [1, 40])
else:
x = F.avg_pool2d(x, [3, 2])
return x
def PPHGNet_tiny(pretrained=False, use_ssld=False, **kwargs):
"""
PPHGNet_tiny
Args:
pretrained: bool=False or str. If `True` load pretrained parameters, `False` otherwise.
If str, means the path of the pretrained model.
use_ssld: bool=False. Whether using distillation pretrained model when pretrained=True.
Returns:
model: nn.Layer. Specific `PPHGNet_tiny` model depends on args.
"""
stage_config = {
# in_channels, mid_channels, out_channels, blocks, downsample
'stage1': [96, 96, 224, 1, False, [2, 1]],
'stage2': [224, 128, 448, 1, True, [1, 2]],
'stage3': [448, 160, 512, 2, True, [2, 1]],
'stage4': [512, 192, 768, 1, True, [2, 1]],
}
model = PPHGNet(stem_channels=[48, 48, 96],
stage_config=stage_config,
layer_num=5,
**kwargs)
return model
def PPHGNet_small(pretrained=False, use_ssld=False, det=False, **kwargs):
"""
PPHGNet_small
Args:
pretrained: bool=False or str. If `True` load pretrained parameters, `False` otherwise.
If str, means the path of the pretrained model.
use_ssld: bool=False. Whether using distillation pretrained model when pretrained=True.
Returns:
model: nn.Layer. Specific `PPHGNet_small` model depends on args.
"""
stage_config_det = {
# in_channels, mid_channels, out_channels, blocks, downsample
'stage1': [128, 128, 256, 1, False, 2],
'stage2': [256, 160, 512, 1, True, 2],
'stage3': [512, 192, 768, 2, True, 2],
'stage4': [768, 224, 1024, 1, True, 2],
}
stage_config_rec = {
# in_channels, mid_channels, out_channels, blocks, downsample
'stage1': [128, 128, 256, 1, True, [2, 1]],
'stage2': [256, 160, 512, 1, True, [1, 2]],
'stage3': [512, 192, 768, 2, True, [2, 1]],
'stage4': [768, 224, 1024, 1, True, [2, 1]],
}
model = PPHGNet(stem_channels=[64, 64, 128],
stage_config=stage_config_det if det else stage_config_rec,
layer_num=6,
det=det,
**kwargs)
return model
def PPHGNet_base(pretrained=False, use_ssld=True, **kwargs):
"""
PPHGNet_base
Args:
pretrained: bool=False or str. If `True` load pretrained parameters, `False` otherwise.
If str, means the path of the pretrained model.
use_ssld: bool=False. Whether using distillation pretrained model when pretrained=True.
Returns:
model: nn.Layer. Specific `PPHGNet_base` model depends on args.
"""
stage_config = {
# in_channels, mid_channels, out_channels, blocks, downsample
'stage1': [160, 192, 320, 1, False, [2, 1]],
'stage2': [320, 224, 640, 2, True, [1, 2]],
'stage3': [640, 256, 960, 3, True, [2, 1]],
'stage4': [960, 288, 1280, 2, True, [2, 1]],
}
model = PPHGNet(stem_channels=[96, 96, 160],
stage_config=stage_config,
layer_num=7,
**kwargs)
return model
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