GitHub user MLnick opened a pull request:
https://github.com/apache/spark/pull/17845
[SPARK-20587][ML] Improve performance of ML ALS recommendForAll
This PR is a `DataFrame` version of #17742 for
[SPARK-11968](https://issues.apache.org/jira/browse/SPARK-11968), for improving
the performance of `recommendAll` methods.
## How was this patch tested?
Existing unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/MLnick/spark ml-als-perf
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17845.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 #17845
----
commit 4fd11b9eb5c21939adf1d104ea2d80de25af1542
Author: Nick Pentreath <[email protected]>
Date: 2017-05-03T09:36:28Z
First cut
commit 29d67774c88dd5c86ff8c5669b0328faa842239a
Author: Nick Pentreath <[email protected]>
Date: 2017-05-03T10:17:00Z
Fix increment error
commit baeadd0403434a12d3868c75c1496b562f560d59
Author: Nick Pentreath <[email protected]>
Date: 2017-05-03T19:05:25Z
Move PQ outside of foreach and update comments
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