GitHub user srowen opened a pull request:
https://github.com/apache/spark/pull/12779
[SPARK-14533] [MLLIB] RowMatrix.computeCovariance inaccurate when values
are very large (partial fix)
## What changes were proposed in this pull request?
Fix for part of SPARK-14533: trivial simplification and more accurate
computation of column means. See also
https://github.com/apache/spark/pull/12299 which contained a complete fix that
was very slow. This PR does _not_ resolve SPARK-14533 entirely.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/srowen/spark SPARK-14533.2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12779.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 #12779
----
commit b154d4e0c33e70e35ff6ca996dd879bf3f2e36ea
Author: Sean Owen <[email protected]>
Date: 2016-04-29T15:06:16Z
Fix for part of SPARK-14533: trivial simplification and more accurate
computation of column means
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