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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2017/05/29 21:53:04 UTC
[jira] [Created] (SYSTEMML-1644) Incorrect results on
multi-threaded dense-dense matrix multiply w/ wide rhs
Matthias Boehm created SYSTEMML-1644:
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Summary: Incorrect results on multi-threaded dense-dense matrix multiply w/ wide rhs
Key: SYSTEMML-1644
URL: https://issues.apache.org/jira/browse/SYSTEMML-1644
Project: SystemML
Issue Type: Bug
Reporter: Matthias Boehm
The following matrix multiply expression yields incorrect results compared to R when run with multi-threaded operations but correct results with single-threaded operations.
{code}
# X is dense 2023 x 1987 matrix
# t(U) is dense 10 x 2023 matrix
R = t(U) %*% X;
{code}
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