GitHub user dbtsai opened a pull request:
https://github.com/apache/spark/pull/3915
[SPARK-5101] Add common ML math functions
When `x` is positive and large, computing `math.log(1 + math.exp(x))` will
lead to arithmetic
overflow. This will happen when `x > 709.78` which is not a very large
number.
It can be addressed by rewriting the formula into `x +
math.log1p(math.exp(-x))` when `x > 0`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/AlpineNow/spark mathutil
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3915.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 #3915
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commit 6b3ca728261bb1fd6273dacec57ecfd1ddedc116
Author: DB Tsai <[email protected]>
Date: 2015-01-06T20:57:25Z
first commit
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