How to extract features of an image from a trained model

Hi all, I try examples/imagenet of pytorch. It is awesome and easy to train, but I wonder how can I forward an image and get the feature extraction result? After I train with examples/imagenet/main.py, I get model as, model_best.pth.tar And I load this file with model = torch.load('model_best.pth.tar') which gives me a dict. How can I use forward method to get a feature (like fc7 layer’s output of