[SPARK-31659] Add VarianceThresholdSelector examples and doc

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.1.0
• Component/s: Documentation, ML
• Assignee: Huaxin Gao
• Reporter: Huaxin Gao
• Created: 07/May/20 16:43
• Updated: 08/May/20 02:58
• Resolved: 08/May/20 02:58

Description

Add VarianceThresholdSelector examples and doc

Issue Links

• links to: [Github] Pull Request #28478 (huaxingao)
• links to: [Github] Pull Request #28478 (huaxingao)