GitHub user mengxr opened a pull request:

    https://github.com/apache/spark/pull/4564

    [SPARK-5769] Set params in constructors and in setParams in Python ML 
pipelines

    This PR allow Python users to set params in constructors and in setParams, 
where we use decorator `keyword_only` to force keyword arguments. The trade-off 
is discussed in the design doc of SPARK-4586.
    
    Generated doc:
    ![screen shot 2015-02-12 at 3 06 58 
am](https://cloud.githubusercontent.com/assets/829644/6166491/9cfcd06a-b265-11e4-99ea-473d866634fc.png)
    
    CC: @davies @rxin

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

    $ git pull https://github.com/mengxr/spark py-pipeline-kw

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

    https://github.com/apache/spark/pull/4564.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 #4564
    
----
commit 8e59180431f4db045160401da4f785f8a34be923
Author: Xiangrui Meng <[email protected]>
Date:   2015-02-12T10:34:56Z

    add setParams and make constructors take params, where we force keyword args

commit c9384b88bbdd87b3f57f84f46e08cfba5f661739
Author: Xiangrui Meng <[email protected]>
Date:   2015-02-12T11:07:20Z

    fix sphinx doc

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