GitHub user jkbradley opened a pull request:

    https://github.com/apache/spark/pull/9674

    [SPARK-11612] [ML] Pipeline and PipelineModel persistence

    Pipeline and PipelineModel extend Readable and Writable.  Persistence 
succeeds only when all stages are Writable.
    
    Note: This PR reinstates tests for other read/write functionality.  It 
should probably not get merged until 
[https://issues.apache.org/jira/browse/SPARK-11672] gets fixed.
    
    CC: @mengxr 

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/jkbradley/spark pipeline-io

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/9674.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #9674
    
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commit f3c633fa87d9bb58b3836397b6dc3e6d94fc9104
Author: Joseph K. Bradley <jos...@databricks.com>
Date:   2015-11-10T21:16:40Z

    added save/load to logreg in spark.ml

commit 375086b7040b8d1723cbd88d44173b87eb93c9d7
Author: Joseph K. Bradley <jos...@databricks.com>
Date:   2015-11-10T21:53:42Z

    fixed read, write for logreg

commit bc4c838506ebaed123df38124c76d38c4fb501a4
Author: Joseph K. Bradley <jos...@databricks.com>
Date:   2015-11-11T18:56:44Z

    added Pipeline save, load but not PipelineModel

commit bf3506f338f62b140874c692b126803884f87324
Author: Joseph K. Bradley <jos...@databricks.com>
Date:   2015-11-12T20:03:22Z

    added PipelineModel save/load

commit 3700091c33005422a36e20f35019422b7aaaf813
Author: Joseph K. Bradley <jos...@databricks.com>
Date:   2015-11-12T20:08:16Z

    reorder for Pipeline.scala classes

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