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java.lang.OutOfMemoryError: Java heap space	at scala.collection.mutable.ArrayBuilder$ofDouble.mkArray(ArrayBuilder.scala:518)	at scala.collection.mutable.ArrayBuilder$ofDouble.resize(ArrayBuilder.scala:524)	at scala.collection.mutable.ArrayBuilder$ofDouble.ensureSize(ArrayBuilder.scala:536)	at scala.collection.mutable.ArrayBuilder$ofDouble.$plus$plus$eq(ArrayBuilder.scala:549)	at scala.collection.mutable.ArrayBuilder$ofDouble.$plus$plus$eq(ArrayBuilder.scala:511)	at scala.collection.mutable.ArrayOps$$anonfun$flatten$2.apply(ArrayOps.scala:83)	at scala.collection.mutable.ArrayOps$$anonfun$flatten$2.apply(ArrayOps.scala:82)	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)	at scala.collection.mutable.ArrayOps$class.flatten(ArrayOps.scala:82)	at scala.collection.mutable.ArrayOps$ofRef.flatten(ArrayOps.scala:186)	at org.apache.spark.mllib.classification.NaiveBayesModel.(NaiveBayes.scala:56)	at org.apache.spark.mllib.classification.NaiveBayes.run(NaiveBayes.scala:433)	at org.apache.spark.mllib.classification.NaiveBayes$.train(NaiveBayes.scala:507)	at org.apache.spark.ml.classification.NaiveBayes.train(NaiveBayes.scala:106)	at org.apache.spark.ml.classification.NaiveBayes.train(NaiveBayes.scala:76)	at org.apache.spark.ml.Predictor.fit(Predictor.scala:90)	at org.apache.spark.ml.Predictor.fit(Predictor.scala:71)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:237)	at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)	at py4j.Gateway.invoke(Gateway.java:280)	at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:128)	at py4j.commands.CallCommand.execute(CallCommand.java:79)	at py4j.GatewayConnection.run(GatewayConnection.java:211)	at java.lang.Thread.run(Thread.java:745)