[jira] [Commented] (SPARK-10750) ML Param validate should print better error information

["Yanbo Liang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-10750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902029#comment-14902029 ] 

Yanbo Liang commented on SPARK-10750:
-------------------------------------

This is because Param.validate(value: T) use value.toString at error information which did not distinguish value of array type or not.

> ML Param validate should print better error information
> -------------------------------------------------------
>
>                 Key: SPARK-10750
>                 URL: https://issues.apache.org/jira/browse/SPARK-10750
>             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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