For what it’s worth I’ve got a few blogs posts and some screen casts on the internals and theory behind cooccurrence recommenders. http://occamsmachete.com/ml/2013/05/10/recommender-as-a-shopping-assistant-part-1/
There are four in this series with the same number of screencasts. All the screencasts are here: http://occamsmachete.com/ml/2014/04/07/recommenders-part-5-the-movie/ Future posts will cover an implementation of a scalable cooccurrence recommender based on Mahout & Solr something along the lines of Ted’s book but with sample code from a running demo site.
