huaxingao opened a new pull request #27094: [SPARK-30419][ML][PySpark] Make IsotonicRegression extend Regressor URL: https://github.com/apache/spark/pull/27094 ### What changes were proposed in this pull request? Make IsotonicRegression extend Regressor ### Why are the changes needed? Regressor should be the super class for all the regression algorithms ### Does this PR introduce any user-facing change? No ### How was this patch tested? Existing tests
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