Which machine learning technique did Netflix famously use in its $1 million Netflix Prize competition to improve its recommendation algorithm?

Netflix revolutionized the film and television industry not just with streaming, but with how they use machine learning to understand and predict viewer preferences. Their recommendation engine is estimated to save the company over $1 billion annually by reducing subscriber churn. This poll tests your knowledge about how streaming platforms use data analytics to shape content creation and marketing strategies in the modern entertainment landscape.

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Collaborative filtering
Convolutional neural networks
Random forest classification
Reinforcement learning