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https://issues.apache.org/jira/browse/SYSTEMML-1655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1655.
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> Wrong cost-based decisions of selecting fusion plans
> ----------------------------------------------------
>
> Key: SYSTEMML-1655
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1655
> Project: SystemML
> Issue Type: Bug
> Affects Versions: SystemML 0.14
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Fix For: SystemML 1.0
>
>
> There are a number of patterns, where the codegen, default cost-based plan
> selector chooses suboptimal plans. This includes:
> 1) Overlapping row aggregates
> {code}
> R1 = t(X) %*% (X %*% v);
> R2 = t(X) %*% (w * (X %*% v));
> {code}
> 2) Outer product plans
> {code}
> R1 = X * (7 + (U %*% t(V) + 3));
> R2 = (X * (7 + (U %*% t(V) + 3))) %*% V;
> R3 = t(U) %*% (X * (7 + (U %*% t(V) + 3)));
> R = as.matrix(sum(R1 * (7 + (R2 %*% R3 + 3))/1e6));
> {code}
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