https://www.youtube.com/watch?v=lh9CNRDqKBk
https://www.youtube.com/watch?v=OYze4BQtn-U&list=PLc2rvfiptPSQgsORc7iuv7UxhbRJox-pW&index=8
https://netflixtechblog.com/system-architectures-for-personalization-and-recommendation-e081aa94b5d8