update torchvision model urls

Author: Lyken17

training/net224x224/__init__.py

@@ -1,8 +1,3 @@
-from .alexnet import *
 from .resnet import *
-from .vgg import *
-from .squeezenet import *
-from .inception import *
-from .densenet import *
 from .mobilenetv2 import *
 from .proxyless_nas.model_zoo import proxyless_cpu, proxyless_gpu, proxyless_mobile, proxyless_mobile_14