[jira] [Commented] (MAHOUT-1578) Optimizations in matrix serialization

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

    [ https://issues.apache.org/jira/browse/MAHOUT-1578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14027666#comment-14027666 ] 

ASF GitHub Bot commented on MAHOUT-1578:
----------------------------------------

GitHub user sscdotopen opened a pull request:

    https://github.com/apache/mahout/pull/16

    MAHOUT-1578 Optimizations in matrix serialization

    MAHOUT-1578: Optimizations in matrix serialization

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

    $ git pull https://github.com/sscdotopen/mahout MAHOUT-1578

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

    https://github.com/apache/mahout/pull/16.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 #16
    
----
commit 645604c7a81762df19bfe3023fcc474490f4c183
Author: ssc <ss...@apache.org>
Date:   2014-06-11T11:52:11Z

    MAHOUT-1578 Optimizations in matrix serialization

----


> Optimizations in matrix serialization
> -------------------------------------
>
>                 Key: MAHOUT-1578
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1578
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Math
>            Reporter: Sebastian Schelter
>             Fix For: 1.0
>
>
> MatrixWritable contains inefficient code in a few places:
>  
>  * type and size are stored with every vector, although they are the same for every vector
>  * in some places vectors are added to the matrix via assign() in places where we could directly use the instance
>  



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