[jira] [Commented] (MAHOUT-1971) Aggregate Transpose Bug

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-1971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15980072#comment-15980072 ] 

ASF GitHub Bot commented on MAHOUT-1971:
----------------------------------------

GitHub user rawkintrevo opened a pull request:

    https://github.com/apache/mahout/pull/307

    MAHOUT-1971 Aggregate Transpose Bug

    Fixes in Spark and Flink bindings- adds test coverage to both.


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

    $ git pull https://github.com/rawkintrevo/mahout mahout-1971

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

    https://github.com/apache/mahout/pull/307.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 #307
    
----
commit 371dfc26a411768b2eae5111edb269b9c9301d2e
Author: rawkintrevo <tr...@gmail.com>
Date:   2017-04-22T18:38:05Z

    MAHOUT-1971 Aggregate Transpose Bug

----


> Aggregate Transpose Bug
> -----------------------
>
>                 Key: MAHOUT-1971
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1971
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Trevor Grant
>            Assignee: Trevor Grant
>             Fix For: 0.13.1
>
>
> In the At operation of Flink and spark there is a line that looks like:
> case (row, blockRow) => colV(row) = blockA(blockRow, blockCol)
> that ought to be 
> case (row, blockRow) => colV(row) += blockA(blockRow, blockCol)
> Since it isnt'- the 'aggregate transpose' does not operate as expected. 
> This needs to be updated in the Spark and Flink bindings (same one char fix). 
> Test coverage should be updated to catch this.



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