Invincible (Skillet album) Invincible (Skillet album) Invincible is the third studio album by American Christian rock band Skillet. It was released in 2000 from ForeFront Records and Ardent Records. This album continues the electronic rock that was heard on their previous release but marks the exit of original guitarist, Ken Steorts, and the entrance of his replacement, Kevin Haaland on guitar, as well as John Cooper's wife Korey on keyboards, loops, sampling and programming. All songs written by John L. Cooper, except where noted. There was a music video made for the song "Best Kept Secret". It was the first video by the
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".