FUP2算法---解决数据库更新后的关联规则挖掘

代码说明：

  香港大学的David W.Cheung写的“A General Incremental Technique for Maintaining Discovered Association Rules”中提到的FUP2算法，用来解决数据库更新后的关联规则挖掘(University of Hong Kong, David W. Cheung wrote "A General Incremental Technique for Maintaining Discovered Association Rules" FUP2 mentioned in the algorithm used to solve the database updated Mining Association Rules)