Which machine learning technique did Netflix famously use to improve its recommendation algorithm through a public competition in 2009?

The film and television industry has been transformed by streaming platforms that leverage sophisticated customer analytics to shape content creation and marketing strategies. These platforms analyze viewing patterns, demographic data, and engagement metrics to make data-driven decisions about what shows to produce, how to market them, and which talent to develop. How well do you understand the analytics behind your favorite streaming services?

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Collaborative filtering through matrix factorization
Convolutional neural networks for visual content analysis
Natural language processing for sentiment analysis
Reinforcement learning for user interface optimization