GitHub user dardelet opened a pull request:
https://github.com/apache/spark/pull/18491
[SPARK-21268][MLLIB] Move center calculations to a distributed map in KMeans
## What changes were proposed in this pull request?
The scal() and creation of newCenter vector is done in the driver, after a
collectAsMap operation while it could be done in the distributed RDD.
This PR moves this code before the collectAsMap for more efficiency
## How was this patch tested?
This was tested manually by running the KMeansExample and verifying that
the new code ran without error and gave same output as before.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dardelet/spark
move-center-calculation-to-distributed-map-kmean
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18491.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 #18491
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commit 59d611295e877654d6fc61e9b28e26aec6e65450
Author: dardelet <guillaumeg...@gmail.com>
Date: 2017-06-30T15:38:12Z
Move center of cluster's calculation to a distributed map
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