Lucy (Skillet song) Lucy (Skillet song) "Lucy" is the fifth single of the 2009 album "Awake" by the Christian rock band Skillet, and is the twelfth and final track on the album. John Cooper initially refrained from discussing the song's full meaning, stating that it has "a gist of regret where you wish you had done things differently" and "even though there's a specific story, it has a lot of interpretations that have kind of meant a lot to a lot of people already." In November 2010, at a concert at the Target Center in Minneapolis, Cooper revealed it is about a young
Item-item collaborative filtering Item-item collaborative filtering Item-item collaborative filtering, or item-based, or item-to-item, is a form of collaborative filtering for recommender systems based on the similarity between items calculated using people's ratings of those items. Item-item collaborative filtering was invented and used by Amazon.com in 1998. It was first published in an academic conference in 2001. The authors of that paper, Badrul Sarwar, George Karypis, Joseph Konstan, and John Riedl, won the 2016 "Test of Time Award" for their paper "Item-based collaborative filtering recommendation algorithms". The International World Wide Web Conference committee stated that "this outstanding paper has had a considerable real-world impact".