Reusing intermediate work? I don't think this is a good intuition. Using several levels of abstraction is more like it. For example, in face recognition, firs

Reusing intermediate work? I don't think this is a good intuition. Using several levels of abstraction is more like it. For example, in face recognition, first level - could be pixels. Second level - edges and corners: http://www.cs.nyu.edu/~yann/research/deep/images/ff1.gif http://www.cs.nyu.edu/~yann/research/deep/images/ff1.gif Third - parts of the face: http://people.cs.umass.edu/~elm/images/face_feature.jpg http://people.cs.umass.edu/~elm/images/face_feature.jpg