Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16131#discussion_r90944278
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/regression/GeneralizedLinearRegression.scala
---
@@ -505,7 +505,7 @@ object GeneralizedLinearRegression extends
DefaultParamsReadable[GeneralizedLine
override def initialize(y: Double, weight: Double): Double = {
require(y >= 0.0, "The response variable of Poisson family " +
s"should be non-negative, but got $y")
- y
+ y + 0.1
--- End diff --
OK that makes some sense but I'm not seeing why 0.1 is added in all cases.
Why isn't the solution to make this the minimum or something? I understand
"that's how R does it" but wondering why that makes sense.
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