Hero (Skillet song) Hero (Skillet song) "Hero" is the first single of the 2009 album "Awake" by the American Christian rock band Skillet and is the first track on the album. The song talks about mankind's need for a hero with the hero being Jesus Christ. It is the fourth single by Skillet to be released to physical media. The single sold 12,000 copies in its first week. It was used in a promo on NBC for the 2009 NFL Kickoff game between the Pittsburgh Steelers and the Tennessee Titans, as well as the Week 17 Sunday Night Football game between the Cincinnati
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".