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java.lang.AssertionError: 	at hex.ModelMetricsClustering$MetricBuilderClustering.perRow(ModelMetricsClustering.java:66)	at hex.Model$BigScore.map(Model.java:517)	at water.MRTask.compute2(MRTask.java:430)	at water.H2O$H2OCountedCompleter.compute(H2O.java:682)	at jsr166y.CountedCompleter.exec(CountedCompleter.java:429)	at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)	at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974)	at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)	at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)