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[SPARK-15030][ML][SPARKR] Support formula in spark.kmeans in SparkR
## What changes were proposed in this pull request? * ```RFormula``` supports empty response variable like ```~ x + y```. * Support formula in ```spark.kmeans``` in SparkR. * Fix some outdated docs for SparkR. ## How was this patch tested? Unit tests. Author: Yanbo Liang <ybliang8@gmail.com> Closes #12813 from yanboliang/spark-15030.
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- R/pkg/R/generics.R 1 addition, 1 deletionR/pkg/R/generics.R
- R/pkg/R/mllib.R 30 additions, 23 deletionsR/pkg/R/mllib.R
- R/pkg/inst/tests/testthat/test_mllib.R 6 additions, 6 deletionsR/pkg/inst/tests/testthat/test_mllib.R
- mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala 2 additions, 2 deletions...src/main/scala/org/apache/spark/ml/feature/RFormula.scala
- mllib/src/main/scala/org/apache/spark/ml/feature/RFormulaParser.scala 8 additions, 1 deletion...in/scala/org/apache/spark/ml/feature/RFormulaParser.scala
- mllib/src/main/scala/org/apache/spark/ml/r/KMeansWrapper.scala 18 additions, 14 deletions.../src/main/scala/org/apache/spark/ml/r/KMeansWrapper.scala
- mllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala 2 additions, 2 deletionsmllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala
- mllib/src/test/java/org/apache/spark/mllib/stat/JavaStatisticsSuite.java 1 addition, 1 deletion...java/org/apache/spark/mllib/stat/JavaStatisticsSuite.java
- mllib/src/test/scala/org/apache/spark/ml/feature/RFormulaSuite.scala 19 additions, 0 deletions...est/scala/org/apache/spark/ml/feature/RFormulaSuite.scala
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