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[SPARK-15767][ML][SPARKR] Decision Tree wrapper in SparkR
## What changes were proposed in this pull request? support decision tree in R ## How was this patch tested? added tests Author: Zheng RuiFeng <ruifengz@foxmail.com> Closes #17981 from zhengruifeng/dt_r.
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- R/pkg/NAMESPACE 5 additions, 0 deletionsR/pkg/NAMESPACE
- R/pkg/R/generics.R 5 additions, 0 deletionsR/pkg/R/generics.R
- R/pkg/R/mllib_tree.R 240 additions, 0 deletionsR/pkg/R/mllib_tree.R
- R/pkg/R/mllib_utils.R 10 additions, 4 deletionsR/pkg/R/mllib_utils.R
- R/pkg/inst/tests/testthat/test_mllib_tree.R 86 additions, 0 deletionsR/pkg/inst/tests/testthat/test_mllib_tree.R
- mllib/src/main/scala/org/apache/spark/ml/r/DecisionTreeClassificationWrapper.scala 152 additions, 0 deletions...apache/spark/ml/r/DecisionTreeClassificationWrapper.scala
- mllib/src/main/scala/org/apache/spark/ml/r/DecisionTreeRegressionWrapper.scala 137 additions, 0 deletions...org/apache/spark/ml/r/DecisionTreeRegressionWrapper.scala
- mllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala 4 additions, 0 deletionsmllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala
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