31. The computer program product of claim 30 , wherein the statistic associated with the first class is generated based on one or more workers that receives examples associated with the first class and wherein the statistic associated with the second class is generated based on one or more workers that receives examples associated with the second class.
30. The computer program product of claim 25 , wherein the operations further comprise generating an updated weight based on an original weight and a weight function, wherein the weight function contains inputs selected from the group consisting of a statistic associated with the first class and a statistic associated with the second class.