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https://issues.apache.org/jira/browse/MAHOUT-1907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884927#comment-15884927
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Andrew Palumbo commented on MAHOUT-1907:
----------------------------------------
Seeing some small Numerical differences here when operations are on GPU vs
OMP/CPU or JVM/CPU.
"fixed" by relaxing the epsilon to 1e-10 from 1e-16; though this may affect
highly iterative algorithms.:
{code}
+ ViennaCL/cpu/OpenMP Sparse multiplication time: 1577 ms.
- VCL Dense Matrix %*% Dense vector *** FAILED ***
1.5059797815742444E-16 was not less than 1.0E-16 (ViennaCLSuiteVCL.scala:349)
{code}
> Correctly implement VCL vector %*% matrix multiplication.
> ---------------------------------------------------------
>
> Key: MAHOUT-1907
> URL: https://issues.apache.org/jira/browse/MAHOUT-1907
> Project: Mahout
> Issue Type: Task
> Affects Versions: 0.12.2
> Reporter: Andrew Palumbo
> Assignee: Andrew Palumbo
> Priority: Blocker
> Fix For: 0.13.0
>
>
> Vector/Matrix Multiplication is currently commented out in the VCL PR. after
> much discussion have found the Bug, will implement it after VCL is pushed.
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