GitHub user mengxr opened a pull request:
https://github.com/apache/spark/pull/5697
[SPARK-7140][MLLIB] only scan the first 16 nonzeros in Vector.hashCode
The Python SerDe calls `Object.hashCode`, which is very expensive for
Vectors. It is not necessary to scan the whole vector, especially for large
ones. In this PR, we only scan the first 16 nonzeros. @srowen
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mengxr/spark SPARK-7140
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/5697.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 #5697
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commit 1ebad606e5aebd9490384e049a18aadc3b98a970
Author: Xiangrui Meng <[email protected]>
Date: 2015-04-25T05:30:59Z
only scan the first 16 nonzeros in Vector.hashCode
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