Which recommendation algorithm technique revolutionized Netflix's content suggestion system in 2006, leading to their famous $1 million Netflix Prize competition?

The film and television industry has undergone massive transformation with the rise of streaming services. These platforms use sophisticated recommendation systems to keep viewers engaged and increase watch time. Test your knowledge about how these systems work behind the scenes to shape viewing habits and content creation strategies in Hollywood.

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Collaborative filtering based on matrix factorization
Content-based filtering using metadata tags
Contextual bandits with reinforcement learning
Deep neural networks with attention mechanisms