这个图会跨线程按照出现的次数对表达式的值进行分组。

A graph that groups the value of an expression with the number of occurrences across threads.

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根据睡眠中苏醒和呼吸暂停的次数来判断病情严重程度，然后据此分组。

Those diagnosed with sleep apnea were divided into groups according to the severity of their condition, as defined by the average number of breathing pauses and sleep disruptions during sleep.

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该算法通过分组及时舍弃挖掘过程中生成的非频繁项目集，有效降低主存压力，减少对数据库的扫描次数，能够对时变数据库进行高效地关联规则挖掘。

The stress of main memory is abated, the times of scan of database are cut down, and the algorithm executes more efficient mining of association rules in time-variant database.

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