Which mathematical technique formed the foundation of Amazon's groundbreaking recommendation system that transformed retail analytics in the early 2000s?

In the world of retail data analytics, mathematics plays a crucial role in developing algorithms that transform how businesses understand customer behavior. This poll tests your knowledge about a famous mathematical breakthrough that revolutionized retail recommendation systems and continues to influence how products are suggested to customers today.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Item-to-Item Collaborative Filtering using sparse matrices
Bayesian Networks with stochastic gradient descent
Markov Decision Processes with reinforcement learning
Neural Network Deep Learning with convolutional layers