[GitHub] [spark] huaxingao opened a new pull request #28478: [SPARK-31659][ML][DOCS] Add VarianceThresholdSelector examples and doc

[GitBox]

huaxingao opened a new pull request #28478:
URL: https://github.com/apache/spark/pull/28478


   ### What changes were proposed in this pull request?
   Add VarianceThresholdSelector examples and doc
   
   
   ### Why are the changes needed?
   VarianceThresholdSelector is a new feature selector in 3.1.0. We need to add 
examples and doc 
   
   
   ### Does this PR introduce _any_ user-facing change?
   Yes.
   add Scala, Python and Java examples for VarianceThresholdSelector. Also add 
doc
   
   <img width="860" alt="Screen Shot 2020-05-07 at 9 20 01 AM" 
src="https://user-images.githubusercontent.com/13592258/81321791-e3f84d80-9047-11ea-837b-e39c193bd437.png";>
   
   <img width="860" alt="Screen Shot 2020-05-07 at 9 20 44 AM" 
src="https://user-images.githubusercontent.com/13592258/81321806-e8246b00-9047-11ea-8f35-206e330a92ab.png";>
   
   <img width="860" alt="Screen Shot 2020-05-07 at 9 21 27 AM" 
src="https://user-images.githubusercontent.com/13592258/81321822-ea86c500-9047-11ea-8743-99adec7f502b.png";>
   
   <img width="860" alt="Screen Shot 2020-05-07 at 9 21 43 AM" 
src="https://user-images.githubusercontent.com/13592258/81321826-ec508880-9047-11ea-9e7a-22ee5e13f495.png";>
   
   
   
   
   ### How was this patch tested?
   Manually checked
   


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