GitHub user actuaryzhang opened a pull request:
https://github.com/apache/spark/pull/16740
[SPARK-19400] Allow GLM to handle intercept only model
## What changes were proposed in this pull request?
Intercept-only GLM is failing for non-Gaussian family because of reducing
an empty array in IWLS. The following code `val maxTolOfCoefficients =
oldCoefficients.toArray.reduce { (x, y) => math.max(math.abs(x), math.abs(y))`
fails in the intercept-only model because `oldCoefficients` is empty. This PR
fixes this issue.
@yanboliang @srowen @imatiach-msft @zhengruifeng
## How was this patch tested?
New test for intercept only model.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/actuaryzhang/spark interceptOnly
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16740.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 #16740
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commit 69d96319abaa7f4aa98c04ce32556a2cb2c065d2
Author: actuaryzhang <[email protected]>
Date: 2017-01-30T07:59:11Z
fix error in reducing empty array
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