Is there any best practice for including user preferences for certain items as a Recommender input, but ensuring that those items are never included in actual recommendations?
For example, suppose that Amazon wanted to produce book recommendations for you. They might still want to include your non-book purchases as inputs to the Recommender (as your taste in DVDs might be quite relevant, for example). But they would never want those non-book items to show up as recommendation outputs (for this particular scenario). Is there some elegant way to accomplish this with Mahout? Or would you just need to implement your own post-processing logic to remove the non-book items? Or is this all a bad idea in general? Thanks, Jamey
