[SPARK-10750] ML Param validate should print better error information

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.6.0
• Component/s: ML
• Target Version/s: 1.6.0
• Assignee: Yanbo Liang
• Reporter: Yanbo Liang
• Shepherd: Joseph K. Bradley
• Created: 22/Sep/15 09:18
• Updated: 22/Sep/15 21:00
• Resolved: 22/Sep/15 21:00

Description

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.

Issue Links

• is duplicated by: SPARK-10751 ML Param validate should print better error information
• links to: [Github] Pull Request #8863 (yanboliang)