Maciej Grzenda created SAMOA-73:
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Summary: Exception in VHT method terminates stream processing
Key: SAMOA-73
URL: https://issues.apache.org/jira/browse/SAMOA-73
Project: SAMOA
Issue Type: Bug
Components: SAMOA-API
Reporter: Maciej Grzenda
Priority: Minor
Attachments: vht_error_stderr.txt
VHT method when executed on some data streams throws
java.lang.NullPointerException. This happens after processing some instances,
which seems to be related to problems with creating a split. The problem can
be observed on airlines.arff from MOA.
Sample command to replicate the problem:
java -cp target/SAMOA-Local-0.5.0-incubating-SNAPSHOT.jar
org.apache.samoa.LocalDoTask "org.apache.samoa.tasks.PrequentialEvaluation -l
org.apache.samoa.learners.classifiers.trees.VerticalHoeffdingTree -s
(ArffFileStream -f airlines.arff) -f 10"
Under such settings ca. 400 instances are processed correctly. The last output
of evaluator is:
classified instances = 390
classifications correct (percent) = 77,436
Kappa Statistic (percent) = 13,07
Kappa Temporal Statistic (percent) = 29,6
Next the exception is thrown, which terminates the processing (see attached
stack trace)
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