huaxingao opened a new pull request #29153:
URL: https://github.com/apache/spark/pull/29153


   
   
   ### What changes were proposed in this pull request?
   set params default values in trait Params for feature and tuning in both 
Scala and Python. 
   
   
   ### Why are the changes needed?
   Make ML has the same default param values between estimator and its 
corresponding transformer, and also between Scala and Python.
   
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   
   ### How was this patch tested?
   Existing and modified tests
   


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