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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (SYSTEMML-1591) Improve efficiency sparse-unsafe cellwise operations
Date Mon, 08 May 2017 05:33:04 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm closed SYSTEMML-1591.
------------------------------------

> Improve efficiency sparse-unsafe cellwise operations
> ----------------------------------------------------
>
>                 Key: SYSTEMML-1591
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1591
>             Project: SystemML
>          Issue Type: Sub-task
>          Components: Compiler, Runtime
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> For sparse-unsafe cellwise operations, we currently iterate over all cells and use binary
search to access the individual values. This is unnecessarily inefficient to should be reworked
in favor of a sequential scan with gap handling, which would also allow us to consolidate
the different code paths for sparse-safe and -unsafe operations.



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