GitHub user mpjlu opened a pull request:
https://github.com/apache/spark/pull/18899
[SPARK-21680][ML][MLLIB]optimzie Vector coompress
## What changes were proposed in this pull request?
When use Vector.compressed to change a Vector to SparseVector, the
performance is very low comparing with Vector.toSparse.
This is because you have to scan the value three times using
Vector.compressed, but you just need two times when use Vector.toSparse.
When the length of the vector is large, there is significant performance
difference between this two method.
## How was this patch tested?
The existing UT
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mpjlu/spark optVectorCompress
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18899.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 #18899
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commit 5dc5c89242a0c2a5ac6a693c3703eef8ee160616
Author: Peng Meng <peng.m...@intel.com>
Date: 2017-08-10T01:59:17Z
optimzie Vector coompress
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