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Posted to dev@mahout.apache.org by "Dmitriy Lyubimov (JIRA)" <ji...@apache.org> on 2014/06/05 00:15:02 UTC

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

     [ https://issues.apache.org/jira/browse/MAHOUT-1572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy Lyubimov updated MAHOUT-1572:
-------------------------------------

    Status: Patch Available  (was: Open)

> 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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