[model_name] object has no attribute 'output'

I downloaded a couple of models from Zoo, such as ‘resnet18_v1b’ or 'ResNet50_v1d ’ via get_model(model_name, pretrained=True) and unfortunately their objects do not have the attribute ‘output’. This leads to the error:

AttributeError: ‘ResNetV1b’ object has no attribute ‘output’

And the ability to define own output layer is lost at least via the method shown in your tutorials:

with finetune_net.name_scope():
finetune_net.output = nn.Dense(classes)

Is it something normal? What would be the advice on how to deal with this?