By Robert M. Bell, Yehuda Koren, and Chris Volinsky

When the Netflix Prize was announced in October of 2006, we initially approached it as a fun diversion from our ‘day jobs’ at AT&T. Our group had worked for many years on building profiles of customer patterns for fraud detection, and we were comfortable with large data sets, so this seemed right up our alley. Plus, it was about movies, and who doesn’t love movies? We thought it would be a fun project for a few weeks.

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