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https://issues.apache.org/jira/browse/SPARK-16000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15342679#comment-15342679
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yuhao yang commented on SPARK-16000:
------------------------------------

Hi [~mengxr], I'm expecting a lot of work needs to be done to support this. 
Currently a lot of algorithms in package classfication, regression, feature, 
recommendation and LDA in clustering need some fix as they have used vector and 
matrix to save/load some information. 
We probably also need convertMatrixColumnsToML/convertMatrixColumnsFromML.

My most optimistic estimation for the task is two weeks. If we do want this in 
2.0, I'll start create sub-tasks.

cc [~josephkb]

> Make model loading backward compatible with saved models using old vector 
> columns
> ---------------------------------------------------------------------------------
>
>                 Key: SPARK-16000
>                 URL: https://issues.apache.org/jira/browse/SPARK-16000
>             Project: Spark
>          Issue Type: Sub-task
>          Components: ML, MLlib
>            Reporter: Xiangrui Meng
>            Assignee: yuhao yang
>
> To help users migrate from Spark 1.6. to 2.0, we should make model loading 
> backward compatible with models saved in 1.6. The main incompatibility is the 
> vector column type change.



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