MOA Tutorial 2 Listing 1

[关洪涛]

I am trying to run Listing1 in eclipse. I meet some trouble

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 

Type mismatch: cannot convert from InstanceExample to Instance

at test.Exercise2_1.main(Exercise2_1.java:24)

package test;

import com.yahoo.labs.samoa.instances.Instance;

import moa.classifiers.Classifier;

import moa.classifiers.trees.HoeffdingTree;

import moa.core.InstanceExample;

import moa.streams.generators.RandomRBFGenerator;

public class Exercise2_1 {

public static void main(String[] args) {

int numInstances =10000;

Classifier learner=new HoeffdingTree();                                               

RandomRBFGenerator stream=new RandomRBFGenerator();                                   

stream.prepareForUse();                                                             

                                                                                   

learner.setModelContext(stream.getHeader());                                        

learner.prepareForUse();                                                            

                                                                                   

int numberSamplesCorrect=0;                                                          

int numberSamples=0;                                                                 

boolean isTesting=true;                                                              

while(stream.hasMoreInstances()&&numberSamples<numInstances){

24: Instance trainInst=stream.nextInstance();                                            

   if(isTesting){                                                                      

if(learner.correctlyClassifies(trainInst)){                                        

numberSamplesCorrect++; 

}

   }

numberSamples++;                                                                    

learner.trainOnInstance(trainInst);                                                 

}

double accuracy=100.0*(double)numberSamplesCorrect/(double)numberSamples;            

System.out.println(numberSamples+" instances processed with"+accuracy+"% accuracy");

}

}

[Albert Bifet]

With the new version of MOA that uses the new instances, there are two ways:

- change line 24 to

Instance trainInst=stream.nextInstance().getData();

-  or change line 24 to

InstanceExample trainInst=stream.nextInstance();   

and also

if(learner.correctlyClassifies(trainInst.getData())){   

Cheers, Albert

  

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[Maxbest]

thank you very much ^_^

在 2015年12月24日星期四 UTC+8上午4:29:08，Albert Bifet写道：