未设置类属性！在weka.core.Capabilities.test(未知源)

Question

我有这个代码

import weka.core.Instances;
import weka.classifiers.bayes.NaiveBayes;
import weka.classifiers.trees.J48;
import weka.classifiers.Evaluation;
import weka.filters.Filter;
import weka.filters.supervised.instance.Resample;

import java.util.Random;
import java.io.BufferedReader;
import java.io.FileReader ;

import weka.filters.unsupervised.attribute.NumericToNominal;
public class LoadModelWeka
{
   public static void main(String[] args) throws Exception {
   // training
      BufferedReader reader = null;
      reader=new BufferedReader(new FileReader("D:\\aaaaaaaaaaaaaaaaaaaaaa\\Licenta\\partXML\\TestTask1_partXML.arff"));
      Instances train =new Instances (reader);
      Instances classBalancerInstances=homogenizeTrainingData(train);
     // classBalancerInstances.setClassIndex(classBalancerInstances.numAttributes() - 1);
      classBalancerInstances.setClassIndex(0);     
      reader.close();

      NaiveBayes nb = new NaiveBayes();
      nb.buildClassifier(classBalancerInstances);
      Evaluation eval = new Evaluation(classBalancerInstances);
      eval.crossValidateModel(nb, classBalancerInstances, 10 , new Random(1));

      System.out.println(eval.toSummaryString("\n Results \n=====\n",true));
      System.out.println(eval.fMeasure(1)+" "+eval.precision(1)+" "+eval.recall(1)+" ");           
   }   

   public static Instances homogenizeTrainingData(Instances data) throws Exception
   {
    final Resample filter = new Resample();
    Instances filteredIns = null;
    filter.setBiasToUniformClass(1.0);
    Instances newData=convertToNominal(data);
    try {
        data.setClassIndex(data.numAttributes() - 1);
        filter.setInputFormat(newData);
        filter.setNoReplacement(false);
        filter.setSampleSizePercent(100);
        filteredIns = Filter.useFilter(newData, filter);
    } catch (Exception e) {
        System.out.println("Error when resampling input data!");
        e.printStackTrace();
    }
    return filteredIns;

   }


public static Instances convertToNominal(Instances originalTrain) throws Exception{

    NumericToNominal convert= new NumericToNominal();
    String[] options= new String[2];
    options[0]="-R";
    options[1]="1-9";  //range of variables to make numeric

    convert.setOptions(options);
    convert.setInputFormat(originalTrain);

    Instances newData=Filter.useFilter(originalTrain, convert);

    System.out.println("Before");
    for(int i=0; i<2; i=i+1)
    {
        System.out.println("Nominal? "+originalTrain.attribute(i).isNominal());
    }

    System.out.println("After");
    for(int i=0; i<2; i=i+1)
    {
        System.out.println("Nominal? "+newData.attribute(i).isNominal());
    }
    return newData;

}
}

在这里，我想用类平衡器过滤我的数据集，但出现了一个错误，并指出属性必须是名义的。我试图转换为名义的，但发生了这个错误：

weka.core.UnassignedClassException: weka.filters.supervised.instance.Resample: Class attribute not set!
    at weka.core.Capabilities.test(Unknown Source)
    at weka.core.Capabilities.test(Unknown Source)
    at weka.core.Capabilities.testWithFail(Unknown Source)
    at weka.filters.Filter.testInputFormat(Unknown Source)
    at weka.filters.Filter.setInputFormat(Unknown Source)
    at weka.filters.supervised.instance.Resample.setInputFormat(Unknown Source)
    at licenta1.LoadModelWeka.homogenizeTrainingData(LoadModelWeka.java:44)
    at licenta1.LoadModelWeka.main(LoadModelWeka.java:22)
Exception in thread "main" java.lang.NullPointerException
    at licenta1.LoadModelWeka.main(LoadModelWeka.java:24)

我试图解决这个问题来设置类索引，但我不是很好地理解它是如何工作的，所以我不知道如何设置实例才能正常工作。我的文件是一个具有9个属性的arff，并且分类是用属性编号9进行的，所以我认为，我必须将1到9的所有列转换为1到9，但我不确定我是否很好地理解了过滤器和从数值到名义工程的转换。

有谁能帮我吗？

我的.arff文件看起来像下面的代码：

@attribute Word {Induction,of,during,monocyte,differentiation,by,HIV,type,1.0,infection,Electrophoretic,mobility,experiments,were,usedare,the,mostmayat,me,to,detect,located,in,long,terminal,repeat,PMA,treatment,acts,probablyin,inducing,expression,nuclei,In,nuclear,extracts,from,monocytes,or,macrophages,induction,occurred,only,if,cells,previously,infected,with,When,U937,no,factor,was,detected,whereas,high,level,progeny,virions,produced,suggesting,that,this,not,required,These,results,indicate,monocytic,cell,lineage,could,mimic,some,stimuli,allowing,Positive,and,negative,regulation,immunoglobulinis,most,suggesthere,gene,a,novel,enhancer,element,A,new,specific,Tandem,copies,fragment,transcription,B,but,Jurkat,T,HeLa,Footprinting,analysis,revealed,Hex,Gel,addition,ubiquitous,band,found,also,agreement,gel,may,Furthermorein,vivo,activity,striking,contrast,mouse,sequence,very,its,own,Interestingly,suppress,promoter,Moreover,simian,virus,40.0,blocked,Thus,identified,study,is,probably,target,site,for,both,positive,factors,The,production,human,immunodeficiency,purified}
@attribute w-2 {'null  ','Induction  ','of  ','during  ','monocyte  ','differentiation  ','by  ','HIV  ','type  ',1.0,'infection  ','Electrophoretic  ','mobility  ','experiments  ','were  ','usedare  ','the  ','mostmayat  ','me  ','to  ','detect  ','located  ','in  ','long  ','terminal  ','repeat  ','PMA  ','treatment  ','acts  ','probablyin  ','inducing  ','expression  ','nuclei  ','In  ','nuclear  ','extracts  ','from ','monocytes  ','or  ','macrophages  ','induction  ','occurred  ','only  ','if  ','cells  ','previously  ','infected  ','with  ','When  ','U937  ','no  ','factor  ','was  ','detected  ','whereas  ','high  ','level  ','progeny  ','virions  ','was ','produced  ','suggesting  ','that  ','this  ','not  ','required  ','These  ','results  ','indicate  ','monocytic  ','cell ','lineage  ','could  ','mimic  ','some  ','stimuli  ','allowing  ','Positive  ','and  ','negative  ','regulation  ','immunoglobulinis  ','most  ','suggesthere  ','gene  ','a  ','novel  ','enhancer  ','element  ','A  ','new  ','specific  ','Tandem  ','copies  ','fragment  ','transcription  ','B  ','but  ','Jurkat  ','T ','HeLa  ','Footprinting  ','analysis  ','revealed  ','from  ','Hex  ','Gel  ','addition  ','ubiquitous  ','band  ','found  ','also  ','T  ','agreement  ','gel  ','in ','may  ','Furthermorein  ','vivo  ','activity  ','striking  ','contrast  ','mouse  ','sequence  ','very  ','its  ','own  ','Interestingly  ','the ','suppress  ','promoter  ','Moreover  ','simian  ','virus  ',40.0,'blocked  ','Thus  ','identified  ','study ','is  ','probably  ','target  ','site  ','for  ','both  ','positive  ','factors  ','The  ','production  ','human  ','immunodeficiency  ','purified  ','human ','monocytes '}
@attribute w-1 {' null  ',' Induction ',' of ',' during ',' monocyte ',' differentiation ',' by ',' HIV ',' type ',1.0,' infection ',' Electrophoretic ',' mobility ',' experiments ',' were ',' usedare ',' the ',' mostmayat ',' me ',' to ',' detect ',' located ',' in ',' long ',' terminal ',' repeat ',' PMA ',' treatment ',' acts ',' probablyin ',' inducing ',' expression ',' nuclei ',' In ',' nuclear ',' extracts ',' from ','  monocytes ',' or ',' macrophages ',' induction ',' occurred ',' only ',' if ',' cells ',' previously ',' infected ',' with ',' When ',' U937 ',' no ',' factor ',' was ',' detected ',' whereas ',' high ',' level ',' progeny ',' virions ','  produced ',' suggesting ',' that ',' this ',' not ',' required ',' These ',' results ',' indicate ',' monocytic ',' cell ','  lineage ',' could ',' mimic ',' some ',' stimuli ',' allowing ',' Positive ',' and ',' negative ',' regulation ',' immunoglobulinis ',' most ',' suggesthere ',' gene ',' a ',' novel ',' enhancer ',' element ',' A ',' new ',' specific ',' Tandem ',' copies ',' fragment ',' transcription ',' B ',' but ',' Jurkat ',' T ','  cells ',' HeLa ',' Footprinting ',' analysis ',' revealed ',' Hex ',' Gel ',' addition ',' ubiquitous ',' band ',' found ',' also ',' agreement ',' gel ','  Jurkat ',' may ',' Furthermorein ',' vivo ',' activity ',' striking ',' contrast ',' mouse ',' sequence ',' very ',' its ',' own ',' Interestingly ','  fragment ',' suppress ',' promoter ',' Moreover ',' simian ',' virus ',40.0,' blocked ',' Thus ',' identified ',' study ','  is ',' probably ',' target ',' site ',' for ',' both ',' positive ',' factors ',' The ',' production ',' human ',' immunodeficiency ',' purified ','  and '}
@attribute w {' Induction ','  of ','  during ','  monocyte ','  differentiation ','  by ','  HIV ','  type ',1.0,'  infection ','  Electrophoretic ','  mobility ','  experiments ','  were ','  usedare ','  the ','  mostmayat ','  me ','  to ','  detect ','  located ','  in ','  long ','  terminal ','  repeat ','  PMA ','  treatment ','  acts ','  probablyin ','  inducing ','  expression ','  nuclei ','  In ','  nuclear ','  extracts ','  from ','  monocytes ','  or  ','  macrophages ','  induction ','  occurred ','  only ','  if ','  cells ','  previously ','  infected ','  with ','  When ','  U937 ','  no ','  factor ','  was ','  detected ','  whereas ','  high ','  level ','  progeny ','  virions ','  produced ','  suggesting  ','  that ','  this ','  not ','  required ','  These ','  results ','  indicate ','  monocytic ','  cell ','  lineage ','  could  ','  mimic ','  some ','  stimuli ','  allowing ','  Positive ','  and ','  negative ','  regulation ','  immunoglobulinis ','  most ','  suggesthere ','  gene ','  a ','  novel ','  enhancer ','  element ','  A ','  new ','  specific ','  Tandem ','  copies ','  fragment ','  transcription ','  B ','  but ','  Jurkat ','  T ','  HeLa ','  Footprinting ','  analysis ','  revealed ','  Hex ','  Gel ','  addition ','  ubiquitous ','  band ','  found ','  also ','  agreement ','  gel ','  may  ','  Furthermorein ','  vivo ','  activity ','  striking ','  contrast ','  mouse ','  sequence ','  very ','  its ','  own ','  Interestingly ','  suppress ','  promoter ','  Moreover ','  simian ','  virus ',40.0,'  blocked ','  Thus ','  identified ','  study ','  is ','  probably  ','  target ','  site ','  for ','  both ','  positive ','  factors ','  The ','  production ','  human ','  immunodeficiency ','  purified ','  macrophages  '}
@attribute w+1 {'  of ','  during  ','  monocyte  ','  differentiation  ','  by  ','  HIV  ','  type  ',1.0,'  infection  ','  Electrophoretic  ','  mobility  ','  experiments  ','  were  ','  usedare  ','  the  ','  mostmayat  ','  me  ','  to  ','  detect  ','  located  ','  in  ','  long  ','  terminal  ','  repeat  ','  PMA  ','  treatment  ','  acts  ','  probablyin  ','  inducing  ','  expression  ','  nuclei  ','  In  ','  nuclear  ','  extracts  ','  from  ','  monocytes  ','  or  ',' macrophages ','  induction  ','  of  ','  occurred  ','  only  ','  if  ','  cells  ','  previously  ','  infected  ','  with  ','  When  ','  U937  ','  no  ','  factor  ','  was  ','  detected  ','  whereas  ','  high  ','  level  ','  progeny  ','  virions  ','  produced  ','  suggesting  ',' that ','  this  ','  not  ','  required  ','  These  ','  results  ','  indicate  ','  that  ','  monocytic  ','  cell  ','  lineage  ','  could  ',' mimic ','  some  ','  stimuli  ','  allowing  ','  Positive  ','  and  ','  negative  ','  regulation  ','  immunoglobulinis  ','  most  ','  suggesthere  ','  gene  ','  a  ','  novel  ','  enhancer  ','  element  ','  A  ','  new  ','  specific  ','  Tandem  ','  copies  ','  fragment  ','  transcription  ','  B  ','  but  ','  Jurkat  ','  T  ',' HeLa ','  Footprinting  ','  analysis  ','  revealed  ',' Hex ','  Gel  ','  addition  ','  ubiquitous  ','  band  ','  found  ','  also  ','  HeLa  ','  agreement  ','  gel  ','  may  ','  Furthermorein  ','  vivo  ','  activity  ','  striking  ','  contrast  ','  mouse  ','  sequence  ','  very  ','  its  ','  own  ','  Interestingly  ',' suppress ','  promoter  ','  Moreover  ','  simian  ','  virus  ',40.0,'  blocked  ','  Thus  ','  identified  ','  study  ','  is  ','  probably  ',' a ','  target  ','  site  ','  for  ','  both  ','  positive  ','  factors  ','  The  ','  production  ','  human  ','  immunodeficiency  ','  purified  ','  macrophages  ',' null '}
@attribute w+2 {'  during  ',' monocyte ',' differentiation ',' by ',' HIV ',' type ',1.0,' infection ',' Electrophoretic ',' mobility ',' experiments ',' were ',' usedare ',' the ',' mostmayat ',' me ',' to ',' detect ',' located ',' in ',' long ',' terminal ',' repeat ',' PMA ',' treatment ',' acts ',' probablyin ',' inducing ',' expression ',' nuclei ',' In ',' nuclear ',' extracts ',' from ',' monocytes ',' or ',' macrophages ','  induction ',' of ',' occurred ',' only ',' if ',' cells ',' previously ',' infected ',' with ',' When ',' U937 ',' no ',' induction ',' factor ',' was ',' detected ',' whereas ',' high ',' level ',' progeny ',' virions ',' produced ',' suggesting ',' that ','  this ',' not ',' required ',' These ',' results ',' indicate ',' monocytic ',' cell ',' lineage ',' could ',' mimic ','  some ',' stimuli ',' allowing ',' Positive ',' and ',' negative ',' regulation ',' immunoglobulinis ',' most ',' suggesthere ',' gene ',' a ',' novel ',' enhancer ',' element ',' A ',' new ',' specific ',' Tandem ',' copies ',' this ',' fragment ',' transcription ',' B ',' but ',' Jurkat ',' T ',' HeLa ','  cells ',' Footprinting ',' analysis ',' revealed ',' Hex ',' Gel ',' addition ',' ubiquitous ',' band ',' found ',' also ',' agreement ',' gel ',' may ',' Furthermorein ',' vivo ',' activity ',' striking ',' contrast ',' mouse ',' sequence ',' very ',' its ',' own ',' Interestingly ',' suppress ','  promoter ',' Moreover ',' simian ',' virus ',40.0,' blocked ',' Thus ',' identified ',' study ',' is ',' probably ','  target ',' site ',' for ',' both ',' positive ',' factors ',' The ',' production ',' human ',' immunodeficiency ',' purified ',' null ','  null '}
@attribute Lemma {induction,of,during,monocyte,differentiation,by,hiv,type,1.0,infection,electrophoretic,mobility,experiment,be,usedare,the,mostmayat,I,to,detect,located,in,long,terminal,repeat,pma,treatment,act,probablyin,induce,expression,nucleus,nuclear,extract,from,or,macrophage,occur,only,if,cell,previously,infected,with,when,u937,no,factor,whereas,high,level,progeny,virion,produce,suggest,that,this,not,require,these,result,indicate,monocytic,lineage,could,mimic,some,stimulus,allow,positive,and,negative,regulation,immunoglobulinis,most,suggesthere,gene,a,novel,enhancer,element,new,specific,Tandem,copy,fragment,transcription,b,but,jurkat,t,hela,footprinting,analysis,reveal,hex,gel,addition,ubiquitous,band,find,also,agreement,may,furthermorein,vivo,activity,striking,contrast,mouse,sequence,very,its,own,interestingly,suppress,promoter,moreover,simian,virus,40.0,block,thus,identify,study,probably,target,site,for,both,production,human,immunodeficiency,purify}
@attribute POS {NNP,IN,NN,CD,RB,NNS,VBD,DT,PRP,TO,VB,VBN,UH,WRB,JJ,VBG,MD,JJS,SYM,VBZ}
@attribute IsCue {'  F','  T'}

@data
Induction,'null  ',' null  ',' Induction ','  of ','  during  ',induction,NNP,'  F'
of,'null  ',' Induction ','  of ','  during  ',' monocyte ',of,IN,'  F'
during,'Induction  ',' of ','  during ','  monocyte  ',' differentiation ',during,IN,'  F'
monocyte,'of  ',' during ','  monocyte ','  differentiation  ',' by ',monocyte,NN,'  F'
differentiation,'during  ',' monocyte ','  differentiation ','  by  ',' HIV ',differentiation,NN,'  F'
by,'monocyte  ',' differentiation ','  by ','  HIV  ',' type ',by,IN,'  F'
HIV,'differentiation  ',' by ','  HIV ','  type  ',1.0,hiv,NNP,'  F'
type,'by  ',' HIV ','  type ',1.0,' infection ',type,NN,'  F'
1.0,'HIV  ',' type ',1.0,'  infection  ',' Electrophoretic ',1.0,CD,'  F'
infection,'type  ',1.0,'  infection ','  Electrophoretic  ',' mobility ',infection,NN,'  F'

分类必须在IsCue函数中，如果当前单词(我指的是行中的第一个单词)是确定的，则attribute.IsCue为true，否则为false。

Answer 1

我找到了这个问题的答案，并发布了it.Ithink可以帮助他人。ClassIndex是我想要在分类中使用的类的索引，我想通过使用属性IsCue对我的示例进行分类，所以我需要在方法中添加下一行numericTonNominal.It必须是我方法中的第一行，如下所示：

    public static Instances convertToNominal(Instances originalTrain) throws Exception{
            originalTrain.setClassIndex(8);
//your code here
}

我将索引设置为8，因为我的属性是数字9，但它从0开始，因此在分类过程中它将成为数字8