As you might notice, the intermediate result does not contain any information about the current group.
您也许已经注意到，中间结果中并不包含任何表示当前分组的信息。
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The intermediate result that is returned to DB2 contains the usual counter (needed for the DB2 MAX function) and the actual weighted average that we have so far for the current group.
The new algorithm was based on single population without intermediate population, in which mutation operation, crossover operation and selection operation were used on the current population.