[alexhawdon]

https://www.coursera.org/course/recsys will provide you with a good introduction to the topic

[contingencies]

Thanks. For others who are interested, that course apparently uses a different piece of software called LensKit http://lenskit.grouplens.org/

Could anyone summarize the difference between Pig and LensKit when applied to recommendation systems?

[rjurney]

The mortar recommendation system is written in Pig, and can scale to any data size, even petabytes. The lenskit tool cannot.