GitHub user yanboliang opened a pull request:
https://github.com/apache/spark/pull/15851
[SPARK-18412][SPARKR][ML] Fix exception for some SparkR ML algorithms
training on libsvm data
## What changes were proposed in this pull request?
* Fix the following exceptions which throws when
```spark.randomForest```(classification), ```spark.gbt```(classification),
```spark.naiveBayes``` and ```spark.glm```(binomial family) were fitted on
libsvm data.
```
java.lang.IllegalArgumentException: requirement failed: If label column
already exists, forceIndexLabel can not be set with true.
```
See [SPARK-18412](https://issues.apache.org/jira/browse/SPARK-18412) for
more detail about how to reproduce this bug.
* Refactor out ```getFeaturesAndLabels``` to RWrapperUtils, since lots of
ML algorithm wrappers use this function.
* Drop some unwanted columns when making prediction.
## How was this patch tested?
Add unit test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yanboliang/spark spark-18412
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15851.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 #15851
----
commit 4752fe2c1e0e211ae2e27a0a7807f141c91430a2
Author: Yanbo Liang <yblia...@gmail.com>
Date: 2016-11-11T10:29:27Z
Handle the case label column already exists and forceIndexLabel = true.
commit 6262178be4b2a085fb48ad0be8b1bf61c7812689
Author: Yanbo Liang <yblia...@gmail.com>
Date: 2016-11-11T10:42:17Z
Add unit tests.
commit 26eb40aaca3b8e4de4d2f1922a83dc2198754c6a
Author: Yanbo Liang <yblia...@gmail.com>
Date: 2016-11-11T11:16:12Z
Set correct label column for classification algorithms.
commit d0d7c28b05bbba51266a9a1364b7fe9e4c452ed9
Author: Yanbo Liang <yblia...@gmail.com>
Date: 2016-11-11T11:47:57Z
Divide spark.gbt test into two parts: classification and regression.
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