How does Netflix recommend movies? In this presentation we go over a very common technique for recommendations called matrix factorization to predict what rating a user will give a movie. It sounds like a complicated mathematical concept, but all it consists of is finding a set of intermediate features such as action, comedy, etc., and using them to help us determine the ratings.
39. Matrix
Factorization
2000 x 1000
2M entries
100 x 1000
100K entries
2000 x 100
200K entries
2000 Users
1000
Movies
100 Features
100
Features
2000 Users
1000
Movies
40.
41.
42. Quiz: How many parameters (arrows)?
20 parameters 18 parameters