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java.lang.AssertionError: -1.0009719E38<NaN n=62	at hex.gbm.DTree$Split.split(DTree.java:224)	at hex.gbm.DTree$DecidedNode.(DTree.java:401)	at hex.drf.DRF$DRFDecidedNode.(DRF.java:595)	at hex.drf.DRF.makeDecided(DRF.java:588)	at hex.gbm.SharedTreeModelBuilder$ScoreBuildOneTree.onCompletion(SharedTreeModelBuilder.java:677)	at jsr166y.CountedCompleter.tryComplete(CountedCompleter.java:386)	at water.RPC$2.compute2(RPC.java:571)	at water.H2O$H2OCountedCompleter.compute(H2O.java:634)	at jsr166y.CountedCompleter.exec(CountedCompleter.java:429)	at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)	at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974)	at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)	at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)