GitHub user hhbyyh opened a pull request:
https://github.com/apache/spark/pull/10146
[SPARK-12026] [MLlib] ChiSqTest gets slower and slower over time when
number of features is large
jira: https://issues.apache.org/jira/browse/SPARK-12026
The issue is valid as features.toArray.view.zipWithIndex.slice(startCol,
endCol) becomes slower as startCol gets larger.
I tested on local and the change can improve the performance and the
running time was stable.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hhbyyh/spark chiSq
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10146.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 #10146
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commit 1b1a0c6c92fc94bc31b8060e1b1f834db20c9d21
Author: Yuhao Yang <hhb...@gmail.com>
Date: 2015-12-04T14:36:47Z
avoid view
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