GitHub user hqzizania opened a pull request:
https://github.com/apache/spark/pull/13891
[SPARK-6685][MLLIB]Use DSYRK to compute AtA in ALS
## What changes were proposed in this pull request?
jira: https://issues.apache.org/jira/browse/SPARK-6685
This is to swtich DSPR to DSYRK to use native BLAS to accelerate the
computation of AtA in ALS. A buffer is allocated to stack vectors to do Level 3
BLAS routine
## How was this patch tested?
java and scala ut
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hqzizania/spark ALSdsyrk
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13891.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13891
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commit 8fb4a82be98588795454127f4281363d105146f0
Author: hqzizania <[email protected]>
Date: 2016-06-24T06:26:31Z
add dsyrk to ALS
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