# Matrix factorization

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The approximation of a matrix by several lower-rank matrices is called **matrix factorization**. Matrix factorization methods are popular collaborative filtering methods, often with good scalability properties and predictive accuracy.

## Literature

- Yehuda Koren, Robert Bell, Chris Volinsky:
*Matrix Factorization Techniques for Recommender Systems.*IEEE Computer, 2009 - Rainer Gemulla, Peter Haas, Erik Nijkamp, Yannis Sismanis:
*Large-Scale Matrix Factorization with Distributed Stochastic Gradient Descent*, KDD 2011