GitHub user mpjlu opened a pull request:
https://github.com/apache/spark/pull/15444
[SPARK-17870][MLLIB][ML]Change statistic to pValue for SelectKBest and
SelectPercentile because of DoF difference
## What changes were proposed in this pull request?
For feature selection method ChiSquareSelector, it is based on the
ChiSquareTestResult.statistic (ChiSqure value) to select the features. It
select the features with the largest ChiSqure value. But the Degree of Freedom
(df) of ChiSqure value is different in Statistics.chiSqTest(RDD), and for
different df, you cannot base on ChiSqure value to select features.
So we change statistic to pValue for SelectKBest and SelectPercentile
## How was this patch tested?
change existing test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mpjlu/spark chisqure-bug
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15444.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 #15444
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commit 59ee17df3b46996bcf62f427c21d0f89b6ced204
Author: Peng <[email protected]>
Date: 2016-10-12T01:10:39Z
Change statistic to pValue for SelectKBest and SelectPercentile
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