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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:16:51 UTC
[jira] [Resolved] (SPARK-6685) Use DSYRK to compute AtA in ALS
[ https://issues.apache.org/jira/browse/SPARK-6685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-6685.
---------------------------------
Resolution: Incomplete
> Use DSYRK to compute AtA in ALS
> -------------------------------
>
> Key: SPARK-6685
> URL: https://issues.apache.org/jira/browse/SPARK-6685
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Xiangrui Meng
> Priority: Minor
> Labels: bulk-closed
>
> Now we use DSPR to compute AtA in ALS, which is a Level 2 BLAS routine. We should switch to DSYRK to use native BLAS to accelerate the computation. The factors should remain dense vectors. And we can pre-allocate a buffer to stack vectors and do Level 3. This requires some benchmark to demonstrate the improvement.
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