Huaxin Gao 08335b651a [SPARK-31659][ML][DOCS] Add VarianceThresholdSelector examples and doc ... ### 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 Closes #28478 from huaxingao/variance_doc. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: zhengruifeng <ruifengz@foxmail.com>		2020-05-08 10:57:35 +08:00
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src/main	[SPARK-31659][ML][DOCS] Add VarianceThresholdSelector examples and doc	2020-05-08 10:57:35 +08:00
pom.xml	[SPARK-30950][BUILD] Setting version to 3.1.0-SNAPSHOT	2020-02-25 19:44:31 -08:00