Ask HN: Semantic Hash for dummies?

Hi,

I'm a dummy. I'm trying to learn more about these. Is there a library I could start with?

I'm very interested in how these can be used for a collaborative filter strategy I have in mind.

AFAIK, I have to take some DBNs and stack them in a certain way but I'm having some issue with how they come together just right.

Any help? :)