GitHub user srowen opened a pull request:
https://github.com/apache/spark/pull/14948
[SPARK-17389] [MLLIB] Significant KMeans speedup with better choice of init
steps, optimizing to remove 'runs'
## What changes were proposed in this pull request?
- Deprecate KMeans 'runs' param which was a no-op since 2.0
- optimize/simplify code now that runs = 1 always
- most significantly, choose initializationSteps = 2 as default for default
k-means|| init because the paper implies that's as optimal and is much faster.
## How was this patch tested?
Jenkins
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/srowen/spark SPARK-17389
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14948.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 #14948
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commit dbed7d77927e4b5181d475d3f8afd1dac31021cf
Author: Sean Owen <so...@cloudera.com>
Date: 2016-09-03T08:23:45Z
Deprecate KMeans 'runs' param which was a no-op since 2.0;
optimize/simplify code now that runs = 1 always; most significantly, choose
initializationSteps = 2 as default for default k-means|| init because the paper
implies that's as optimal and is much faster.
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