序列模式的概念最早是由Agrawal和Srikant 提出的 序列模式定义：给定一个由不同序列组成的集合，其中，每个序列由不同的元素按顺序有序排列，每个元素由不同项目组成，同时给定一个用户指定的最小支持度阈值，序列模式挖掘就是找出所有的频繁子序列，即该子序列在序列集中的出现频率不低于用户指定的最小支持度阈值-sequential pattern is the earliest concept of Agrawal and Srikant from the sequential pattern

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