[jira] [Commented] (MAHOUT-1572) blockify() to detect (naively) the data sparsity in the loaded data

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

    [ https://issues.apache.org/jira/browse/MAHOUT-1572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018266#comment-14018266 ] 

ASF GitHub Bot commented on MAHOUT-1572:
----------------------------------------

GitHub user dlyubimov opened a pull request:

    https://github.com/apache/mahout/pull/10

    MAHOUT-1572 blockify() to detect (naively) the data sparsity in the loaded data

    naive initial  fix (?)

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

    $ git pull https://github.com/dlyubimov/mahout MAHOUT-1572

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

    https://github.com/apache/mahout/pull/10.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 #10
    
----
commit 162c5ca36e00af91a9599075332c577d9b1a13c4
Author: Dmitriy Lyubimov <dl...@apache.org>
Date:   2014-06-04T22:10:11Z

    initial fix (?)

----


> blockify() to detect (naively) the data sparsity in the loaded data 
> --------------------------------------------------------------------
>
>                 Key: MAHOUT-1572
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1572
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Dmitriy Lyubimov
>             Fix For: 1.0
>
>
> per [~ssc]:
> .bq a dense matrix is converted into a SparseRowMatrix with dense row vectors by blockify(), after serialization this becomes a dense matrix in sparse format (triggering OOMs)! 
> i guess we can look at first row vector and go on to either DenseMatrix or SparseRowMatrix



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