Csv to MOA arff format

[Andrea Dal Pozzolo]

Hello, 

I've a csv file that I want to convert into a stream.

I've tried to convert it into a arff file using the foreing package in R for weka and then import it to MOA but I get the following error:

java.lang.RuntimeException: ArffFileStream failed to read instance from stream.

at moa.streams.ArffFileStream.readNextInstanceFromFile(ArffFileStream.java:162)

at moa.streams.ArffFileStream.restart(ArffFileStream.java:142)

at moa.streams.ArffFileStream.prepareForUseImpl(ArffFileStream.java:89)

at moa.options.AbstractOptionHandler.prepareForUse(AbstractOptionHandler.java:76)

at moa.options.AbstractOptionHandler.prepareClassOptions(AbstractOptionHandler.java:156)

at moa.tasks.AbstractTask.doTask(AbstractTask.java:52)

at moa.tasks.TaskThread.run(TaskThread.java:76)

Caused by: java.io.IOException: number expected, read Token[FALSE], line 38

at weka.core.converters.ArffLoader$ArffReader.errorMessage(ArffLoader.java:327)

at weka.core.converters.ArffLoader$ArffReader.getInstanceFull(ArffLoader.java:721)

at weka.core.converters.ArffLoader$ArffReader.getInstance(ArffLoader.java:523)

at weka.core.converters.ArffLoader$ArffReader.readInstance(ArffLoader.java:488)

at weka.core.Instances.readInstance(Instances.java:1039)

at moa.streams.ArffFileStream.readNextInstanceFromFile(ArffFileStream.java:150)

... 6 more

What I did was

1) load csv into R

2) use  write.arff(Trx,file="Trx.arff") to write R data.frame as arff file for weka

3) 

java -cp moa.jar -javaagent:sizeofag.jar moa.DoTask \

"EvaluatePeriodicHeldOutTest -l (OzaBag -l trees.HoeffdingTree -s 10)\

 -s (ArffFileStream -f /Users/Andrea/Documents/Education/MOA/data/Trx/Trx.arff)" > htresult.csv

I guess the arff format of weka is different from the arff format in MOA?

thanks

Andrea

[Albert Bifet]

The format of arff file used in moa is very similar to the Weka format
file. You may try to convert the file using weka:

http://weka.wikispaces.com/Converting+CSV+to+ARFF

Cheers, Albert

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[Andrea Dal Pozzolo]

I found the problem, the function write.arff() in R is not able to handle logical classes.

Thanks

Andrea