Re: BVDecompose Error

> On Jul 20, 2021, at 2:04 PM, Peter Reutemann <[email protected]> wrote:
> 
> The setClassIndex method of BVDecompose uaes a 1-based index, not 0-based:
> 
> https://weka.sourceforge.io/doc.dev/weka/classifiers/BVDecompose.html#setClassIndex-int- <https://weka.sourceforge.io/doc.dev/weka/classifiers/BVDecompose.html#setClassIndex-int->
> 
> Cheers, Peter
> 
> 
>         data.setClassIndex(data.numAttributes() - 1);
> 
>         RandomForest rf = new RandomForest();
>         rf.setNumIterations(100);
>         rf.setMaxDepth(0);
>         rf.buildClassifier(data);
> 
> 
>         bv.setClassIndex(data.numAttributes() - 1);
>         bv.setClassifier(rf);

I think you could probably get rid of the bv.setClassIndex(). The error changed for me anyhow. I think it was this one. 

/usr/libexec/java_home -v 1.8 --exec java -cp .:/Applications/weka-3-9-5/weka.jar RF Truthiness.arff
NaN
1.0
0
Exception in thread "main" java.lang.IllegalArgumentException: Illegal Capacity: -2147483648
	at java.util.Vector.<init>(Vector.java:136)
	at java.util.Vector.<init>(Vector.java:151)
	at weka.classifiers.BVDecomposeSegCVSub.decompose(BVDecomposeSegCVSub.java:758)
	at RF.<init>(RF.java:40)
	at RF.main(RF.java:46)


The setClassIndex was already done for the RandomForest classifier that you in turn included in the BVDecomposeSetCVSub?
I assume maybe my error is due to some parameter you included CLI that the code doesn’t or that the quick arff data I threw together wasn’t good enough. It did show the class attribute as Nominal in Explorer.

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