[jira] Commented: (HAMA-79) MappedMatrix Input/output formatter

["Samuel Guo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HAMA-79?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638962#action_12638962 ] 

Samuel Guo commented on HAMA-79:
--------------------------------

why we map a 2D matrix onto a 1D map? Is there any advantage of this kind of format? I am confusing about it.

> MappedMatrix Input/output formatter
> -----------------------------------
>
>                 Key: HAMA-79
>                 URL: https://issues.apache.org/jira/browse/HAMA-79
>             Project: Hama
>          Issue Type: New Feature
>          Components: mapred 
>            Reporter: Edward J. Yoon
>             Fix For: 0.1.0
>
>
> MappedMatrixInput/Output formmatter is implementation of an row by column matrix as a one-dimensional map.
> A 2D matrix can be mapped onto a 1D map, like so: 
>  [a b c]
>  [d e f] 
> <<row0,column0>, a>
> <<row0,column1>, b>
> ...

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