一种适应大型数据库的多支持度关联规则算法

关联规则挖掘一直是数据挖掘中的重要组成部分。提出一个新算法DPCFP-growth算法。DPCFP-growth算法是基于MSApirori算法，采用了CFP-growth分而治之的思想，并弥补了CFP-growth算法的不足。CFP-growth算法运行时要把整个数据库中的数据压缩到一个MIS-tree中然后进行频繁模式挖掘。在大型数据库中CFP-growth算法会建立一个深度很深宽度很宽的CFP-tree，以至于内存往往不能满足其要求，被迫使用大量的辅存，致使算法的运行效率急剧下降。DPCFP-growth算法根据CFP-tree的特征，有效地把大数据库分为若干个内存可以满足其要求的子数据库，然后在每个子数据库中进行局部频繁模式挖掘，最终汇总这些频繁模式生成全局频繁模式。实验表明该算法是正确的，并且在大型数据挖掘中，比CFP-growth算法有一定的优越性。

New algorithm for mining association rules with multiple supports in large databases

Mining association rules from a large database have been described as an important problem of database mining.In this paper，a novel algorithm DPCFP-growth is proposes.The algorithm based upon the MSApirori takes advantage of the advantage and offsets the disadvantage of CFP-growth that CFP-growth always needs so much EMS memory in large database that the computer can’t meet it.In DPCFP-growth algorithm，according to characters of MIS-tree，firstly partition a large database into some smaller databases which EMS memory of computer can meet them.Secondly the algorithm takes in the thinking of the CFP-growth to mining local frequent patterns.Finally，the algorithm parses the set of all the local frequent patterns to get final frequent patterns.The experiments show that the DPCFP-growth algorithm has more superiority to previous algorithm.