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java.lang.ArrayIndexOutOfBoundsException: 5 at ciir.umass.edu.learning.tree.FeatureHistogram.findBestSplit(Unknown Source) at ciir.umass.edu.learning.tree.FeatureHistogram$Worker.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)