Wayne Zhang created SPARK-18166:
-----------------------------------
Summary: GeneralizedLinearRegression Wrong Value Range for Poisson
Distribution
Key: SPARK-18166
URL: https://issues.apache.org/jira/browse/SPARK-18166
Project: Spark
Issue Type: Bug
Components: ML
Affects Versions: 2.0.0
Reporter: Wayne Zhang
The current implementation of Poisson GLM seems to allow only positive values
(See below). This is not correct since the support of Poisson includes the
origin.
override def initialize(y: Double, weight: Double): Double = {
require(y {color:red} > {color} 0.0, "The response variable of Poisson
family " +
s"should be positive, but got $y")
y
}
The fix is easy, just change it to
require(y {color:red} >= {color} 0.0, "The response variable of Poisson family
" +
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