1、Hebei University关联分类算法的研究赵东垒符号学习研究组Hebei Universityn课题研究目的n国际研究现状n主要研究内容和创新点n研究过程可能遇到的困难及解决方案n总结n参考文献Hebei Universityn分类问题是通过分析给定的一个带有类别标识的训练数据集，建立一个分类器，然后预测那些未知类别的数据对象n关联分类算法n数据集中属性的取值是符号型的n课题研究目的就是改进、优化关联分类算法q提高关联分类算法的分类精度q提高关联分类算法的效率q提高关联分类算法的可理解性课题研究目的Hebei University国际研究现状n1998年Liu等提出了基于类关联规则的分
2、类算法CBA。n1999年Dong等提出显露模式分类法CAEP。n2000年Wang等结合关联规则分类和决策树分类提出关联决策树。n2001年Li等提出基于多条关联规则的分类算法CMAR。n2003年Yin等提出预测型关联规则的分类算法CPAR。CPAR采用贪婪方法从数据集中挖掘出较小规则集。n2004年Antonie提出正负关联规则的分类算法。n2005年Wang提出HARMONY，它直接挖掘覆盖样例置信度最高的规则。n2006年Adriano Veloso等提出的lazy关联分类。n2006，2007年Arunasalam提出了适用与类不平衡数据上的关联分类。Hebei Universit
3、y基本概念n关联规则：A=BnIf A then Cn定义1 规则的支持度q数据集中匹配规则前件A, 并且满足类别属性取值为C的样例的个数. n定义2 规则的置信度 q规则的支持度与数据集中匹配规则前件A的样例的个数的比值. &ACAHebei University主要研究内容和创新点n关联分类算法的优点q分类精度高q适应性强n关联分类算法存在的问题q算法的执行效率更高效的挖掘方法q剪枝的质量和效率新的规则序关系q分类器的可理解性交叠现象对分类起的影响Hebei University已完成的工作n算法的执行效率q在构造带类别标识的FP-tree时，在每个节点注册相应类别信息。q扩展TD-FP-
4、Growth算法，使它能直接挖掘满足最小支持度和最小置信度的类关联规则。q优点：两次扫描数据库，不用重复建立条件FP-tree。减少了内存消耗，提高了运行效率。Hebei University带类别标识FP-tree的构造Hebei Universityn剪枝的质量和效率q关联分类中最敏感的问题n如何评价类关联规则的质量n如何从大量的关联规则中选择有效的规则构造分类器Hebei University如何评价类关联规则的质量n经典关联分类规则序关系的定义n给定规则Ri，Rj。 Ri优于Rj，当且仅当满足以下条件之一: qRi具有比Rj更高的置信度qRi和Rj具有相同的置信度， Ri具有比Rj更高
5、的支持度qRi和Rj具有相同的置信度和支持度， Ri具有比Rj更少的规则项Hebei Universityn经典关联分类规则序关系的缺点q其本质是采用置信度，支持度，规则项数目评价顺序。过分强调了置信度，这样在最后构造的分类器中，使得有些规则置信度很高而支持度不高，造成过度拟合。n综合考虑置信度和支持度。&( )ACPredAcc RAHebei UniversitynR1: sup(R1) = 100, conf(R1) = 98%nR2: sup(R2) = 10, conf(R2) = 100%n经典序关系 R1 R2nR1有较好的泛化能力，R2可能过度拟合数据。Hebei Univer
6、sity15个UCI数据库测试结果Hebei University医疗图像数据库测试结果Hebei University以后要完成的工作n完善规则评价函数q引入规则的项数q考虑类别不平衡情况n分类器中规则交叠对分类精度的影响Hebei University分类器的可理解性n关联分类构造分类器的方法q挖掘满足置信度和支持度阈值要求的类关联规则q将规则按定义的序关系排序，基于数据覆盖来选择规则n分类器的特点q数据集中每条记录都被一条评价值最高的规则覆盖q分类器中的规则在训练集中存在相互交叠的现象q规则的数目较多Hebei University交叠现象怎样产生的1.10.20.30.40R1:20,
7、 100%R4:20, 85%R2:20, 95%R3:20, 90%Hebei University交叠问题解决方法n每选择一条规则后，更新剩余规则的置信度，支持度。n难度q更新的计算量大q采用更新，是否比以前的方法有效Hebei University研究过程可能遇到的困难及解决方案n规则评价函数的确定q不同数据库的影响n交叠现象对分类精度的影响q选择规则后，更新置信度和支持度q比较不同交叠情况的分类精度Hebei University总结n针对关联分类算法存在的问题q算法的执行效率q剪枝的质量和效率q分类器的可理解性Hebei University参考文献1 B. Liu, W. Hsu
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