A simple code to visualize net structure(SimpleNN/DagNN) for matconvnet homepage.
DOT (https://en.wikipedia.org/wiki/DOT_(graph_description_language))
Linux/Ubuntu users can install it by "apt-get install graphviz". Windows/Mac can download it from http://www.graphviz.org
The following picture is a 2stream inception net in test_net.m. You can run demo.m for more reference.