GitHub user dbtsai opened a pull request:
https://github.com/apache/spark/pull/3462
Implement the efficient vector norm
The vector norm in breeze is implemented by `activeIterator` which is known
to be very slow.
In this PR, an efficient vector norm is implemented, and with this API,
`Normalizer` has huge
performance gain.
Here is the benchmark against mnist8m dataset.
Before
DenseVector: 68.25secs
SparseVector: 17.01secs
With this PR
DenseVector: 12.71secs
SparseVector: 2.73secs
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/AlpineNow/spark norm
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3462.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 #3462
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commit c1a877c1ce13cd797f7cbf122acf603e6f82ecf6
Author: DB Tsai <dbt...@alpinenow.com>
Date: 2014-11-26T00:50:51Z
first commit
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