It has smaller orders of magnitude than the set of all frequent itemsets.

它所包含的模式数量比频繁集所包含的模式数量小若干数量级。

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The iWidget framework provides the ability to manage and persist name-value pairs called itemSets.

iWidget 框架提供管理和持久化称为 ItemSet 的名-值对的能力。

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The existing association rules mining algorithms are chiefly based on frequent itemsets, and the record about infrequent itemsets is very rare.

现有关联规则挖掘算法都是在频繁项集基础上进行挖掘，关于非频繁项集的资料很少。

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