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https://issues.apache.org/jira/browse/SYSTEMML-1545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1545.
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> Incorrect leftindexing memory estimate w/ empty input in loops
> --------------------------------------------------------------
>
> Key: SYSTEMML-1545
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1545
> Project: SystemML
> Issue Type: Bug
> Reporter: Matthias Boehm
> Assignee: Matthias Boehm
> Priority: Blocker
> Fix For: SystemML 0.14
>
>
> The current memory estimate of leftindexing operations is incorrect (in terms
> of a dangerous underestimation that leads to OOMs) for empty input matrices
> in loops. For example, consider the following script
> {code}
> R = matrix(0, N, r^2);
> parfor(i in 1:nrow(X)) {
> Xi = X[i,]
> R[i,] = matrix(t(Xi)%*%Xi, 1, ncol(X)^2)
> }
> {code}
> In this scenario, the memory estimate of R[i,] is mistakenly set to a single
> row, which is only valid during dynamic recompilation with constant indexing
> range quantifiers.
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