GitHub user Syrux opened a pull request:
https://github.com/apache/spark/pull/17575
[SPARK-20265][MLlib] Improve Prefix'span pre-processing efficiency
## What changes were proposed in this pull request?
Improve PrefixSpan pre-processing efficency by preventing sequences of zero
in the cleaned database.
The efficiency gain is reflected in the following graph :
https://postimg.org/image/9x6ireuvn/
## How was this patch tested?
Using MLlib's PrefixSpan existing tests and tests of my own on the 8
datasets shown in the graph. All
result obtained were stricly the same as the original implementation
(without this change).
dev/run-tests was also runned, no error were found.
Author : Cyril de Vogelaere <cyril.devogela...@gmail.com>
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/Syrux/spark SPARK-20265
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17575.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 #17575
----
commit 7af4945fbfb309f7a7784cba2b1fc4cb4945fba0
Author: Syrux <pokcy...@hotmail.com>
Date: 2017-04-08T10:17:04Z
[SPARK-20265][MLlib] Improve Prefix'span pre-processing efficiency
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