GitHub user WeichenXu123 opened a pull request:

    [SPARK-20114][ML] parity for sequential pattern mining - PrefixSpan

    ## What changes were proposed in this pull request?
    PrefixSpan API for
    Note: Currently there's no sequential rule mining support in 
`mllib.PrefixSpan` so we cannot implement `PrefixSpanModel.transform`. In this 
PR, the transform do nothing. Or we can throw out unsupport-operation 
exception. I am open to both of them.
    ## How was this patch tested?
    Testsuite added.

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

    $ git pull prefix_span

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

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

    This closes #20810
commit 6751e70a0e38f203009caa4a7f1899fa203041fe
Author: WeichenXu <weichen.xu@...>
Date:   2018-03-13T13:07:36Z

    init pr

commit c1c5338c5698bb4fa87151fd8ba5cc986e1e1466
Author: WeichenXu <weichen.xu@...>
Date:   2018-03-13T13:19:57Z

    fix style



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