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https://issues.apache.org/jira/browse/SPARK-10751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yanbo Liang closed SPARK-10751.
-------------------------------
Resolution: Duplicate
> ML Param validate should print better error information
> -------------------------------------------------------
>
> Key: SPARK-10751
> URL: https://issues.apache.org/jira/browse/SPARK-10751
> Project: Spark
> Issue Type: Bug
> Components: ML
> Reporter: Yanbo Liang
> Priority: Minor
>
> Currently when you set illegal value for params of array type (such as
> IntArrayParam, DoubleArrayParam, StringArrayParam), it will throw
> IllegalArgumentException but with incomprehensible error information.
> For example:
> val vectorSlicer = new
> VectorSlicer().setInputCol("features").setOutputCol("result")
> vectorSlicer.setIndices(Array.empty).setNames(Array("f1", "f4", "f1"))
> It will throw IllegalArgumentException as:
> vectorSlicer_b3b4d1a10f43 parameter names given invalid value
> [Ljava.lang.String;@798256c5.
> java.lang.IllegalArgumentException: vectorSlicer_b3b4d1a10f43 parameter names
> given invalid value [Ljava.lang.String;@798256c5.
> Users can not understand which params were set incorrectly.
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