Exception in thread "main" java.lang.Error: Unresolved compilation problem: Type mismatch: cannot convert from InstanceExample to Instance

[Malak Noor]

Could anyone tell me pleas, why I got the following error , when using this code:



Exception in thread "main" java.lang.Error: Unresolved compilation problem:
    Type mismatch: cannot convert from InstanceExample to Instance

    at moa.tasks.examplecode.main(examplecode.java:40)

package moa.tasks;

import moa.streams.ExampleStream;
import com.yahoo.labs.samoa.instances.Instance;
import com.yahoo.labs.samoa.instances.Instances;
import moa.core.Example;
import moa.learners.Learner;
import com.yahoo.labs.samoa.instances.Instance;
import com.yahoo.labs.samoa.instances.InstanceData;
import com.yahoo.labs.samoa.instances.Prediction;

import moa.classifiers.Classifier;
import moa.classifiers.trees.HoeffdingTree;
import moa.streams.generators.RandomRBFGenerator;
import weka.core.converters.ConverterUtils.DataSource;
public class examplecode  {

     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){
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") ;
     }

}

Note:
when doing cast type (Instance trainInst=     (Instance) stream.nextInstance();)
I got this error:
Exception in thread "main" java.lang.ClassCastException: moa.core.InstanceExample cannot be cast to com.yahoo.labs.samoa.instances.Instance
    at moa.tasks.examplecode.main(examplecode.java:40)

[Albert Bifet]

Take a look at this example:

http://moa.cms.waikato.ac.nz/using-moas-api-with-scala/

Cheers, Albert

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