SE模块
论文链接:https://arxiv.org/abs/1709.01507
将SE模块添加到MMYOLO中
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将开源代码SE.py文件复制到mmyolo/models/plugins目录下
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导入MMYOLO用于注册模块的包: from mmyolo.registry import MODELS
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确保 class SEAttention中的输入维度为in_channels(因为MMYOLO会提前传入输入维度参数,所以要保持参数名的一致)
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利用@MODELS.register_module()将“class SEAttention(nn.Module)”注册:
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修改mmyolo/models/plugins/__init__.py文件
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在终端运行:
python setup.py install
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修改对应的配置文件,并且将plugins的参数“type”设置为“SEAttention”,可参考【YOLO改进】主干插入注意力机制模块CBAM(基于MMYOLO)-优快云博客
修改后的SE.py
import torch
from torch import nn
from torch.nn import init
from mmyolo.registry import MODELS
@MODELS.register_module()
class SEAttention(nn.Module):
def __init__(self, in_channels=512,reduction=16):
super().__init__()
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.fc = nn.Sequential(
nn.Linear(in_channels, in_channels // reduction, bias=False),
nn.ReLU(inplace=True),
nn.Linear(in_channels // reduction, in_channels, bias=False),
nn.Sigmoid()
)
def init_weights(self):
for m in self.modules():
if isinstance(m, nn.Conv2d):
init.kaiming_normal_(m.weight, mode='fan_out')
if m.bias is not None:
init.constant_(m.bias, 0)
elif isinstance(m, nn.BatchNorm2d):
init.constant_(m.weight, 1)
init.constant_(m.bias, 0)
elif isinstance(m, nn.Linear):
init.normal_(m.weight, std=0.001)
if m.bias is not None:
init.constant_(m.bias, 0)
def forward(self, x):
b, c, _, _ = x.size()
y = self.avg_pool(x).view(b, c)
y = self.fc(y).view(b, c, 1, 1)
return x * y.expand_as(x)
if __name__ == '__main__':
input=torch.randn(50,512,7,7)
se = SEAttention(channel=512,reduction=8)
output=se(input)
print(output.shape)
修改后的__init__.py
# Copyright (c) OpenMMLab. All rights reserved.
from .cbam import CBAM
from .Biformer import BiLevelRoutingAttention
from .A2Attention import DoubleAttention
from .CoordAttention import CoordAtt
from .CoTAttention