Xgboost4j.java.Booster.evalSet throw java.lang.NumberFormatException when set count:poisson objective

[huaxz1986]

When set objective = reg:linear , traning is ok. However, when set objective = count:poisson, training throw error in spark 0.81:

20/04/22 19:13:40 WARN TaskSetManager: Lost task 4.0 in stage 16.0 (TID 20, 100.76.14.183, executor 2): java.lang.NumberFormatException: For input string: "inf"
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
	at sun.misc.FloatingDecimal.parseFloat(FloatingDecimal.java:122)
	at java.lang.Float.parseFloat(Float.java:451)
	at java.lang.Float.valueOf(Float.java:416)
	at ml.dmlc.xgboost4j.java.Booster.evalSet(Booster.java:189)
	at ml.dmlc.xgboost4j.java.XGBoost.train(XGBoost.java:194)
	at ml.dmlc.xgboost4j.scala.XGBoost$.train(XGBoost.scala:64)
	at ml.dmlc.xgboost4j.scala.spark.XGBoost$$anonfun$buildDistributedBoosters$1.apply(XGBoost.scala:139)
	at ml.dmlc.xgboost4j.scala.spark.XGBoost$$anonfun$buildDistributedBoosters$1.apply(XGBoost.scala:116)
	at org.apache.spark.rdd.ZippedPartitionsRDD2.compute(ZippedPartitionsRDD.scala:89)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:324)
	at org.apache.spark.rdd.RDD$$anonfun$7.apply(RDD.scala:337)
	at org.apache.spark.rdd.RDD$$anonfun$7.apply(RDD.scala:335)
	at org.apache.spark.storage.BlockManager$$anonfun$doPutIterator$1.apply(BlockManager.scala:1165)
	at org.apache.spark.storage.BlockManager$$anonfun$doPutIterator$1.apply(BlockManager.scala:1156)
	at org.apache.spark.storage.BlockManager.doPut(BlockManager.scala:1091)
	at org.apache.spark.storage.BlockManager.doPutIterator(BlockManager.scala:1156)
	at org.apache.spark.storage.BlockManager.getOrElseUpdate(BlockManager.scala:882)
	at org.apache.spark.rdd.RDD.getOrCompute(RDD.scala:335)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:286)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:90)
	at org.apache.spark.scheduler.Task.run(Task.scala:123)
	at org.apache.spark.executor.Executor$TaskRunner$$anonfun$10.apply(Executor.scala:408)
	at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:1374)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:414)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

[hcho3]

Fixed in #5546. Please upgrade to version 1.1.0.