[GitHub] spark pull request #20446: [SPARK-23254][ML] Add user guide entry for DataFr...

[WeichenXu123]

GitHub user WeichenXu123 opened a pull request:

    https://github.com/apache/spark/pull/20446

    [SPARK-23254][ML] Add user guide entry for DataFrame multivariate summary

    ## What changes were proposed in this pull request?
    
    Add user guide and scala/java examples for `ml.stat.Summarizer`
    
    ## How was this patch tested?
    
    Doc generated snapshot:
    
    
![image](https://user-images.githubusercontent.com/19235986/35600897-2bb9c102-05e5-11e8-849f-e327f5555125.png)
    
![image](https://user-images.githubusercontent.com/19235986/35600910-3b022f28-05e5-11e8-823e-ae61009317a0.png)
    
![image](https://user-images.githubusercontent.com/19235986/35600918-43c24f3a-05e5-11e8-847d-446452838e05.png)


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/WeichenXu123/spark summ_guide

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/20446.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #20446
    
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commit 307f75f4990049f78978364af4541cd20e4d5bd7
Author: WeichenXu <weichen.xu@...>
Date:   2018-01-31T01:41:48Z

    init pr

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