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And the Winner of the Netflix Prize is …

BellKor’s Pragmatic Chaos!  While The Ensemble nipped BPC at the wire for the public test sets, the BellKor team did better on the hidden test set.  From the announcement:

Team BellKor’s Pragmatic Chaos edged out team The Ensemble with the winning submission coming just 24 minutes before the conclusion of the nearly three-year-long contest.  Historically the Leaderboard has only reported team scores on the quiz subset. The Prize is awarded based on teams’ test subset score. Now that the contest is closed we will be updating the Leaderboard to report team scores on both the test and quiz subsets.

Great work by all of the teams:  I think we really do understand a bit more about this data and about data mining in general due to this contest.

Looks like this was successful enough for Netflix to plan a second contest.