Ajay Saini created SPARK-21542:
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             Summary: Helper functions for custom Python Persistence
                 Key: SPARK-21542
                 URL: https://issues.apache.org/jira/browse/SPARK-21542
             Project: Spark
          Issue Type: New Feature
          Components: ML, PySpark
    Affects Versions: 2.2.0
            Reporter: Ajay Saini


Currnetly, there is no way to easily persist Json-serializable parameters in 
Python only. All parameters in Python are persisted by converting them to Java 
objects and using the Java persistence implementation. In order to facilitate 
the creation of custom Python-only pipeline stages, it would be good to have a 
Python-only persistence framework so that these stages do not need to be 
implemented in Scala for persistence. 

This task involves:
- Adding implementations for DefaultParamsReadable, DefaultParamsWriteable, 
DefaultParamsReader, and DefaultParamsWriter in pyspark.



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