Semantic Hash for newbs

Hi,

So I have some math background but I'm having a bit of trouble understanding what I need to do.

I get the impression that I have a a multi layer neural network with SDAs in the layers.

My goal is to find a semantic hash for documents. Maybe there's a pybrains implementation somewhere I could look at when I want to make my own.

Here are some resources I found. http://deeplearning.net/tutorial/code/SdA.pyhttp://www.cs.toronto.edu/~rsalakhu/papers/semantic_final.pdf