weka.apriori中的java堆空间错误

Question

我正在对我的数据实现Aprioiri算法。这些数据有将近700条记录，几乎有81个属性。我想为这些数据生成关联规则。这是我的程序的代码：

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);
}

}

但是，在运行15分钟后，它会出现以下错误：

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)

数据采用.arff格式，每个属性都有1或0。只有最后一个属性表示结果类。以下是数据中的5个例子：

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

你能帮我找出问题吗？

Answer 1

使用未定义的值来表示缺勤，而不是0。

此外，您还需要增加内存限制，并且应该考虑更高效的算法(如FPGrowth )，以及比Weka更高效的内存工具。