GitHub user mengxr opened a pull request:
https://github.com/apache/spark/pull/161
[SPARK-1260]: faster construction of features with intercept
The current implementation uses `Array(1.0, features: _*)` to construct a
new array with intercept. This is not efficient for big arrays because
`Array.apply` uses a for loop that iterates over the arguments. `Array.+:` is a
better choice here.
Also, I don't see a reason to set initial weights to ones. So I set them to
zeros.
JIRA: https://spark-project.atlassian.net/browse/SPARK-1260
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mengxr/spark sgd
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/161.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 #161
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commit a1439c219167eb697ed6b938873c208d75df5677
Author: Xiangrui Meng <[email protected]>
Date: 2014-03-17T17:23:06Z
faster construction of features with intercept
commit b5cfc530143c71ed4ef6c1b761379e73a5416563
Author: Xiangrui Meng <[email protected]>
Date: 2014-03-17T18:13:01Z
set default weights to zeros
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