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[SPARK-14313][ML][SPARKR] AFTSurvivalRegression model persistence in SparkR
## What changes were proposed in this pull request? ```AFTSurvivalRegressionModel``` supports ```save/load``` in SparkR. ## How was this patch tested? Unit tests. Author: Yanbo Liang <ybliang8@gmail.com> Closes #12685 from yanboliang/spark-14313.
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- R/pkg/R/mllib.R 27 additions, 0 deletionsR/pkg/R/mllib.R
- R/pkg/inst/tests/testthat/test_mllib.R 13 additions, 0 deletionsR/pkg/inst/tests/testthat/test_mllib.R
- mllib/src/main/scala/org/apache/spark/ml/r/AFTSurvivalRegressionWrapper.scala 49 additions, 3 deletions.../org/apache/spark/ml/r/AFTSurvivalRegressionWrapper.scala
- mllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala 2 additions, 0 deletionsmllib/src/main/scala/org/apache/spark/ml/r/RWrappers.scala
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