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

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

Yanbo Liang created SPARK-10750:
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             Summary: 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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