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https://issues.apache.org/jira/browse/SPARK-30452?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean R. Owen resolved SPARK-30452.
----------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

Issue resolved by pull request 27122
[https://github.com/apache/spark/pull/27122]

> Add predict and numFeatures in Python IsotonicRegressionModel
> -------------------------------------------------------------
>
>                 Key: SPARK-30452
>                 URL: https://issues.apache.org/jira/browse/SPARK-30452
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML, PySpark
>    Affects Versions: 3.0.0
>            Reporter: Huaxin Gao
>            Assignee: Huaxin Gao
>            Priority: Trivial
>             Fix For: 3.0.0
>
>
> Since IsotonicRegressionModel doesn't extend JavaPredictionModel, predict and 
> numFeatures need to be added explicitly. 



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