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### What changes were proposed in this pull request? Add a generic ClassificationSummary trait ### Why are the changes needed? Add a generic ClassificationSummary trait so all the classification models can use it to implement summary. Currently in classification, we only have summary implemented in ```LogisticRegression```. There are requests to implement summary for ```LinearSVCModel``` in https://issues.apache.org/jira/browse/SPARK-20249 and to implement summary for ```RandomForestClassificationModel``` in https://issues.apache.org/jira/browse/SPARK-23631. If we add a generic ClassificationSummary trait and put all the common code there, we can easily add summary to ```LinearSVCModel``` and ```RandomForestClassificationModel```, and also add summary to all the other classification models. We can use the same approach to add a generic RegressionSummary trait to regression package and implement summary for all the regression models. ### Does this PR introduce _any_ user-facing change? ### How was this patch tested? existing tests Closes #28710 from huaxingao/summary_trait. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Sean Owen <srowen@gmail.com> |
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