Which machine learning technique was first successfully implemented at scale by Amazon in the late 1990s to create their groundbreaking product recommendation system?

The intersection of scientific advancement and retail innovation has transformed how businesses analyze customer behavior and optimize operations. Machine learning algorithms now power recommendation engines, inventory management, and predictive analytics across the retail landscape. Test your knowledge about the evolution and implementation of machine learning technologies that have revolutionized scientific approaches to retail operations.

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Collaborative filtering
Neural networks
Random forest algorithms
Natural language processing