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From Himanshu Mohan <>
Subject RE: [jira] [Updated] (SYSTEMML-1591) Improve efficiency sparse-unsafe cellwise operations
Date Sat, 09 Sep 2017 01:15:12 GMT
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-----Original Message-----
From: Glenn Weidner (JIRA) [] 
Sent: Saturday, September 09, 2017 6:43 AM
Subject: [jira] [Updated] (SYSTEMML-1591) Improve efficiency sparse-unsafe cellwise operations


Glenn Weidner updated SYSTEMML-1591:
    Fix Version/s:     (was: SystemML 1.0)
                   SystemML 0.15

> Improve efficiency sparse-unsafe cellwise operations
> ----------------------------------------------------
>                 Key: SYSTEMML-1591
>                 URL:
>             Project: SystemML
>          Issue Type: Sub-task
>          Components: Compiler, Runtime
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 0.15
> 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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