特征提取网络（分类）

以下网络可通过torchvision.models导入

import torchvision.models as models

resnet18 = models.resnet18(pretrained=True)
vgg16 = models.vgg16(pretrained=True)
alexnet = models.alexnet(pretrained=True)
squeezenet = models.squeezenet1_0(pretrained=True)

1. AlexNet

2. vgg

3. googlenet

https://my.oschina.net/u/876354/blog/1637819

4. resnet

5. squeezenet