huaxingao opened a new pull request #26154: [SPARK-29232][ML] Update the parameter maps of the DecisionTreeRegression/Classification Models URL: https://github.com/apache/spark/pull/26154 ### What changes were proposed in this pull request? The trees (Array[```DecisionTreeRegressionModel```]) in ```RandomForestRegressionModel``` only contains the default parameter value. Need to update the parameter maps for these trees. Same issues in ```RandomForestClassifier```, ```GBTClassifier``` and ```GBTRegressor``` ### Why are the changes needed? User wants to access each individual tree and build the trees back up for the random forest estimator. This doesn't work because trees don't have the correct parameter values ### Does this PR introduce any user-facing change? Yes. Now the trees in ```RandomForestRegressionModel```, ```RandomForestClassifier```, ```GBTClassifier``` and ```GBTRegressor``` have the correct parameter values. ### How was this patch tested? Add tests
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