systemml-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Berthold Reinwald (JIRA)" <>
Subject [jira] [Updated] (SYSTEMML-1570) Remove fused sel+ operator
Date Thu, 21 Dec 2017 06:05:03 GMT


Berthold Reinwald updated SYSTEMML-1570:
    Fix Version/s:     (was: SystemML 1.0)
                   SystemML 1.1

> Remove fused sel+ operator
> --------------------------
>                 Key: SYSTEMML-1570
>                 URL:
>             Project: SystemML
>          Issue Type: Task
>            Reporter: Matthias Boehm
>             Fix For: SystemML 1.1
> The fused operator sel+ (select positive values) is applied for patterns like (X>0)*X
and max(X,0) in order to eliminate unnecessary intermediates. It stems from a time when max
was sparse-unsafe and hence inefficient over sparse data. However, meanwhile we mark scalar
operators as conditionally sparse-safe depending on the given scalar constant c, which applies
for max if c<=0. Hence, this sel+ operator is meanwhile completely useless and should be
> Furthermore, we should also generalize the rewrites to rewrite the selection of negative
values (X<0)*X to min(X,0)

This message was sent by Atlassian JIRA

View raw message