Question

我使用Weka lib和Random Forest实现了一个小的java应用程序。我已经训练了一些带有样本数据的分类器，并获得了大约85％的精确度。但是，当我使用快速随机森林（https://code.google.com/p/fast-random-forest/）时，它开始抛出错误。

我已经实现了快速随机森林并使用当前的jar文件构建它。但是，当我们在Training Data上评估分类器时，它会不断出现以下错误：

 "The method evaluateModel(Classifier, Instances, Object...) 
  in the type Evaluation is not applicable for the arguments 
  (FastRandomForest, Instances) "

对于这个当前代码：

    FastRandomForest rTree = new FastRandomForest();        
    rTree.buildClassifier(trainingData);

    showTree(rTree);

    System.out.println("records: " + trainingData.attribute(classIndex));
    System.out.println("number of instances: " + trainingData.numInstances());
    System.out.println(trainingData.instance(1));
    System.out.println("target: " + trainingData.classAttribute());
    //System.out.println(rTree.classifyInstance(trainingData.instance(1)));


    /* Evaluate the classifier on Training data */
    Evaluation eTest = new Evaluation(trainingData);
    eTest.evaluateModel(rTree, trainingData); 
    String strSummary = eTest.toSummaryString(); 
    System.out.println(strSummary);

帮助赞赏!!

Answer 1

问题是FastRandomForest无法分配给Classifier。您可以创建adapter以使FastRandomForest行为像Classifier。

public class FastRandomForestAdapter : Classifier {
  private FastRandomForest frf;
  public FastRandomForestAdpter(FastRandomForest frf) {
    this.frf = frf;
  }

  @override
  public void MethodA() {
    frf.Method1();
  }

  @override
  public ReturnType MethodB(object arg) {
    return frf.Method2(Transform(arg));
  }

  private Transform(object a) {
    ...
  }
}

快速随机森林算法实现

1 个答案: