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https://issues.apache.org/jira/browse/SPARK-15573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15491974#comment-15491974
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yuhao yang commented on SPARK-15573:
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This sounds feasible. Two primary work items as I see:
1. Find a scandalized way to save models for different versions.
2. How to ensure model loading correctness for all the versions. (there might
be parameter values change across versions).
> Backwards-compatible persistence for spark.ml
> ---------------------------------------------
>
> Key: SPARK-15573
> URL: https://issues.apache.org/jira/browse/SPARK-15573
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Joseph K. Bradley
>
> This JIRA is for imposing backwards-compatible persistence for the
> DataFrames-based API for MLlib. I.e., we want to be able to load models
> saved in previous versions of Spark. We will not require loading models
> saved in later versions of Spark.
> This requires:
> * Putting unit tests in place to check loading models from previous versions
> * Notifying all committers active on MLlib to be aware of this requirement in
> the future
> The unit tests could be written as in spark.mllib, where we essentially
> copied and pasted the save() code every time it changed. This happens
> rarely, so it should be acceptable, though other designs are fine.
> Subtasks of this JIRA should cover checking and adding tests for existing
> cases, such as KMeansModel (whose format changed between 1.6 and 2.0).
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