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| An Algorithm for Mining Closed Frequent Patterns Based on Projection Sum Tree |
| YANG ChuanYao1, ZHANG ChengHong2, HU YunFa1 |
1.Department of Computing and Information Technology, Fudan University, Shanghai 2004332.
Department of Information Management and Information System, Fudan University, Shanghai 200433 |
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Abstract In this paper, a new algorithm for mining closed frequent patterns is presented based on a projection sum frequent items tree. This algorithm projects the transaction base into a projection sum frequent items tree and stores the patterns compactly with the help of tiers. When mining, it can make full use of the existing computational result which has been done without repeat computation. It traverses the projection tree only once and does not need to generate the conditional FP trees dynamically and recursively and it avoids much timeconsuming I/O. The experiment shows that it has a high efficiency on dense datasets.
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Received: 15 January 2007
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2008, Vol. 21 
