Database Reference
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is achievable by relatively simple approaches, whereas it takes a very
sophisticated approach to get from 80 percent of optimal to 90 percent of
optimal. For example, the famous Netflix prize offered $1 million to the
team that could produce a 10 percent improvement in its recommendation
engine.Althoughateamaccomplishedthisfeat,thefullalgorithmwasnever
implementedbecausethecostofimplementationoutweighedthegainsfrom
further improvement of the algorithm.