Github user wangmiao1981 commented on a diff in the pull request:
https://github.com/apache/spark/pull/16767#discussion_r98968984
--- Diff: R/pkg/vignettes/sparkr-vignettes.Rmd ---
@@ -84,7 +84,7 @@ class(carsGP)
SparkR supports a number of commonly used machine learning algorithms.
Under the hood, SparkR uses MLlib to train the model. Users can call `summary`
to print a summary of the fitted model, `predict` to make predictions on new
data, and `write.ml`/`read.ml` to save/load fitted models.
-SparkR supports a subset of R formula operators for model fitting,
including â~â, â.â, â:â, â+â, and â-â. We use linear
regression as an example.
+SparkR supports a subset of R formula operators for model fitting,
including ???~???, ???.???, ???:???, ???+???, and ???-???. We use linear
regression as an example.
--- End diff --
why ???
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