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建设网站加盟,手机网站预约表单,做网站项目,html5视频播放器例子预训练 ResNet18 模型注入方法在预训练的 ResNet18 模型中注入自定义模块或修改现有结构时#xff0c;需确保不破坏原有特征提取能力。以下是常见注入方法#xff1a;修改特定层结构 通过替换或扩展特定层#xff08;如卷积层、全连接层#xff09;实现功能注入。例如…预训练 ResNet18 模型注入方法在预训练的 ResNet18 模型中注入自定义模块或修改现有结构时需确保不破坏原有特征提取能力。以下是常见注入方法修改特定层结构通过替换或扩展特定层如卷积层、全连接层实现功能注入。例如在最后一层前插入自定义模块import torch.nn as nn from torchvision.models import resnet18 model resnet18(pretrainedTrue) model.fc nn.Sequential( nn.Linear(512, 256), nn.ReLU(), nn.Linear(256, 10) # 修改输出维度 )插入注意力机制在中间层注入注意力模块如SEBlockclass SEBlock(nn.Module): def __init__(self, channels, reduction16): super().__init__() self.squeeze nn.AdaptiveAvgPool2d(1) self.excitation nn.Sequential( nn.Linear(channels, channels // reduction), nn.ReLU(), nn.Linear(channels // reduction, channels), nn.Sigmoid() ) model.layer2.add_module(se_block, SEBlock(128))特征融合注入通过跳跃连接将不同层特征融合class FusionModule(nn.Module): def __init__(self, in_channels): super().__init__() self.conv nn.Conv2d(in_channels*2, in_channels, 1) def forward(self, x1, x2): x torch.cat([x1, x2], dim1) return self.conv(x) fusion FusionModule(64) model.layer1.register_forward_hook(lambda m, inp, out: fusion(out, inp[0]))注入后的微调策略分层学习率设置对注入模块使用更高学习率预训练层采用较低学习率optimizer torch.optim.SGD([ {params: model.parameters(), lr: 0.001}, {params: fusion.parameters(), lr: 0.01} ], momentum0.9)渐进式解冻先冻结所有层仅训练注入模块逐步解冻深层for param in model.parameters(): param.requires_grad False fusion.train() # 后续按epoch逐步解冻layer4、layer3等验证注入效果特征可视化使用Grad-CAM等工具比较注入前后特征响应from torchcam.methods import GradCAM cam_extractor GradCAM(model, layer4) activations cam_extractor(input_tensor)性能指标对比记录注入前后的验证集准确率、推理速度等关键指标确保注入不会显著降低模型效率。典型评估流程with torch.no_grad(): for data in val_loader: outputs model(data) # 计算accuracy, 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