huaxingao opened a new pull request #28913:
URL: https://github.com/apache/spark/pull/28913


   ### What changes were proposed in this pull request?
   Add summary to RandomForestClassificationModel...
   
   ### Why are the changes needed?
   so user can get a summary of this classification model, and retrieve common 
metrics such as accuracy, weightedTruePositiveRate, roc (for binary), pr curves 
(for binary), etc.
   
   
   ### Does this PR introduce _any_ user-facing change?
   Yes
   ```
   RandomForestClassificationModel.summary
   RandomForestClassificationModel.evaluate
   ```
   
   ### How was this patch tested?
   Add new tests
   


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