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:



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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