GitHub user yanboliang opened a pull request:
https://github.com/apache/spark/pull/8863
[SPARK-10750] [ML] ML Param validate should print better error information
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.
Take ```VectorSlicer.setNames``` as an example:
```scala
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.
```
We should distinguish the value of array type from primitive type at
Param.validate(value: T), and we will get better error information.
```
vectorSlicer_3b744ea277b2 parameter names given invalid value [f1,f4,f1].
java.lang.IllegalArgumentException: vectorSlicer_3b744ea277b2 parameter
names given invalid value [f1,f4,f1].
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yanboliang/spark spark-10750
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8863.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #8863
----
commit e007688888db7b5bf6bc9ddd9a0e5db278f538ba
Author: Yanbo Liang <[email protected]>
Date: 2015-09-22T06:27:47Z
ML Param validate should print better error information
commit d937e87299c76b5c58599cfc85f56c016a32ea1e
Author: Yanbo Liang <[email protected]>
Date: 2015-09-22T06:33:12Z
fix typos
----
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