Which recommendation algorithm technique was famously used by Netflix in their $1 million prize competition to improve their recommendation system by 10%?

Recommendation systems have revolutionized retail by personalizing customer experiences and boosting sales. These sophisticated AI algorithms analyze purchase history, browsing behavior, and other data points to suggest products customers are likely to buy. But how much do you know about the technology powering these systems that influence billions in retail sales annually? Test your knowledge about the algorithms and strategies retailers use to predict what you want before you even know you want it.

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Matrix Factorization
Deep Neural Networks
Association Rule Mining
K-Nearest Neighbors