Github user feynmanliang commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8498#discussion_r38232345
  
    --- Diff: docs/ml-guide.md ---
    @@ -21,19 +21,10 @@ title: Spark ML Programming Guide
     \]`
     
     
    -Spark 1.2 introduced a new package called `spark.ml`, which aims to 
provide a uniform set of
    -high-level APIs that help users create and tune practical machine learning 
pipelines.
    -
    -*Graduated from Alpha!*  The Pipelines API is no longer an alpha 
component, although many elements of it are still `Experimental` or 
`DeveloperApi`.
    -
    -Note that we will keep supporting and adding features to `spark.mllib` 
along with the
    -development of `spark.ml`.
    -Users should be comfortable using `spark.mllib` features and expect more 
features coming.
    -Developers should contribute new algorithms to `spark.mllib` and can 
optionally contribute
    -to `spark.ml`.
    -
    -See the [Algorithm Guides section](#algorithm-guides) below for guides on 
sub-packages of `spark.ml`, including feature transformers unique to the 
Pipelines API, ensembles, and more.
    -
    +The `spark.ml` package aims to provide a uniform set of high-level APIs 
that help users create and
    +tune practical machine learning pipelines.
    --- End diff --
    
    Should we mention Dataframes here in `ml-guide` as well as in `mllib-guide`?


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