Skillet (band) for highest-charting Christian album on the "Billboard" 200 with Underoath's 2006 release "Define the Great Line" and Casting Crowns' 2007 release "The Altar and the Door", as all three albums debuted at No. 2. Skillet was nominated for six Dove Awards for the 41st Annual GMA Dove Awards. "Awake" was certified gold July 2, 2010. Also in 2010, Ardent released "The Early Years", a collection of their songs from 1996 to 2001. On November 12, Skillet released an iTunes sessions EP consisting of songs from "Comatose" and "Awake". "Monster" was certified gold a day later. On February 14, 2011, Skillet
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".