Netflix Million Dollar Competition Enters Final Stage

In connection with ambitious plans, I spent the last couple of days studying various algorithms of collective recommendations. Naturally, searching for information led me to the Netflix website, which promised $ 1,000,000 to someone who could exceed the accuracy of their own Cinematch recommendation algorithm by at least 10%. The competition began on October 2, 2006, and now, a few days ago, on June 26, the BellKor's Pragmatic Chaos team was able to achieve an accuracy improvement of 10.05%. Their algorithm predicts users to evaluate on a five-point system with an average error not exceeding 0.8558. Now the competition has entered the final stage, the other participants have 30 days to offer the best algorithm, if during this time no one surpasses the result of BellKor's Pragmatic Chaos, then they will receive $ 1,000,000. The website will contain a description of the winners algorithm, but not source.