[1]王威 陈梅.基于位集合的Apriori算法的改进[J].计算机技术与发展,2011,(12):70-72.
 WANG Wei,CHEN Mei.Improvement of Apriori Algorithm Based on BitSet[J].,2011,(12):70-72.
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基于位集合的Apriori算法的改进()
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《计算机技术与发展》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2011年12期
页码:
70-72
栏目:
智能、算法、系统工程
出版日期:
1900-01-01

文章信息/Info

Title:
Improvement of Apriori Algorithm Based on BitSet
文章编号:
1673-629X(2011)12-0070-03
作者:
王威 陈梅
贵州大学计算机科学与信息学院
Author(s):
WANG Wei CHEN Mei
College of Computer Science and Information, Guizhou University
关键词:
数据挖掘关联规则频繁项集位集合Apriori算法
Keywords:
data mining association rule frequent itemsets BitSet Apriori algorithm
分类号:
TP311.13
文献标志码:
A
摘要:
针对经典Apriori算法运行效率瓶颈问题,结合位集合占用内存空间少、逻辑运算快的特点,提出一种基于位集合的改进算法ABS。该算法通过一次数据库扫描,构建事务集位集合;采用位集合逻辑“与”运算和位统计操作确定频繁项集;改进连接和剪枝策略,采用位集合的逻辑“或”运算,统计运算结果重复出现次数,生成候选项集。挖掘实例数据库Noahwind的频繁项集,对比Apriori算法,改进算法运行时间明显减少。该算法避免了数据库的重复扫描和繁琐的连接减枝操作,进一步提高了Apriori算法的运行效率
Abstract:
It puts forward an improved Apriori algorithm based on BitSet which avoids the bottleneck problem in the efficiency of the classic Apriori algorithm and combines with the BitSet characteristics of taking up less memory space and faster logical operation. This algorithm constitutes transactional BitSet by scanning database one time,using logical "and" operation of BitSet and bit-count operation to determine the frequent itemsets. Improving the strategies of connecting and pruning,it uses logical "or" operation of BitSet and counts the repeated number of operation result for generating candidate itemsets. By mining frequent itemsets of Northwind sample database, compared with Apriori algorithm, the running time of improved algorithm decreases sharply. The algorithm avoids repeated database scanning and complicated operations of connecting and pruning,and furthermore,increases the efficiency of Apriori algorithm

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备注/Memo

备注/Memo:
贵州省科技计划工业攻关基金项目(黔科合GY字[2008]3035)王威(1987-),女,辽宁彰武人,硕士研究生,研究方向为数据库技术;陈梅,教授,硕士生导师,研究方向为数据库技术
更新日期/Last Update: 1900-01-01