"Netflix and Ch– Vectors"

Apparently, Netflix uses vectors to build a specific and unique recommendation list for each user. It’s like Netflix creates a user vector where it stores all of the rating records for all the shows/movies that a user watches there.

here’s a good blog article where you can learn more about Netflix’s usage of vectors for recommendation 😀
https://nikhilwins.wordpress.com/2015/09/18/movie-recommendations-how-does-netflix-do-it-a-9-step-coding-intuitive-guide-into-collaborative-filtering/

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