weka.apriori中的java堆空间错误

问题描述：

我在我的数据上实现了Aprioiri算法。数据近700条记录，近81个属性。我想为这些数据生成关联规则。这是我的程序代码：weka.apriori中的java堆空间错误

public class Aprioritest { 

/** 
* @param args the command line arguments 
*/ 
public static void main(String[] args) throws Exception { 
String dataset = "C:/Users/pc-4/Desktop/CasebaseWithDiseasenamesCSV_1.arff"; 
DataSource source = new DataSource(dataset); 
Instances newData = source.getDataSet(); 

NumericToNominal filter = new NumericToNominal(); 
    filter.setInputFormat(newData); 
    newData = Filter.useFilter(newData, filter); 

     for(int i=0; i<5; i=i+1) 
    { 
     System.out.println("Nominal? "+newData .attribute(i).isNominal()); 
    } 

    Apriori model = new Apriori(); 

model.buildAssociations(newData); 
System.out.println(model); 
} 

}

但十五分钟后运行它提供了以下错误：

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space 
    at java.util.Arrays.copyOf(Arrays.java:3181) 
    at java.util.ArrayList.grow(ArrayList.java:261) 
    at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235) 
    at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227) 
    at java.util.ArrayList.add(ArrayList.java:458) 
    at weka.associations.AprioriItemSet.mergeAllItemSets(AprioriItemSet.java:587) 
    at weka.associations.Apriori.findLargeItemSets(Apriori.java:1677) 
    at weka.associations.Apriori.buildAssociations(Apriori.java:518) 
    at aprioritest.Aprioritest.main(Aprioritest.java:43) 
C:\Users\pc-4\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53:   
Java returned: 1 
BUILD FAILED (total time: 15 minutes 27 seconds)

的数据是在.arff格式，并且每个属性具有1或0 。只有最后一个属性代表最终的类。以下是来自数据的5个示例：

0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,A 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,A 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,A 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,A 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,A

您能否找出问题所在？

答

而不是0，使用undefined表示不存在。另外，您需要增加内存限制，而应该考虑更高效的算法，如FPGrowth和比Weka更高效的内存工具。

weka.apriori中的java堆空间错误

相关推荐