GitHub user srowen opened a pull request:

    https://github.com/apache/spark/pull/15177

    [SPARK-11918] [ML] Better error from WLS for cases like singular input

    ## What changes were proposed in this pull request?
    
    Update error handling for Cholesky decomposition to provide a little more 
info when input is singular.
    
    
    ## How was this patch tested?
    
    New test case; jenkins tests.

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

    $ git pull https://github.com/srowen/spark SPARK-11918

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

    https://github.com/apache/spark/pull/15177.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 #15177
    
----
commit e76886592f928644b2c0787dd8987aaedc2fb1fc
Author: Sean Owen <so...@cloudera.com>
Date:   2016-09-21T08:36:15Z

    Update error handling for Cholesky decomposition to provide a little more 
info when input is singular

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