Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16344#discussion_r93420653
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/regression/GeneralizedLinearRegression.scala
---
@@ -397,14 +436,19 @@ object GeneralizedLinearRegression extends
DefaultParamsReadable[GeneralizedLine
/** Trim the fitted value so that it will be in valid range. */
def project(mu: Double): Double = mu
+
+ /** Constant added to y = 0 for initialization or deviance to avoid
numerical issues. */
+ val delta: Double = 0.1
--- End diff --
This should be defined in an `object`; it's a static constant. The comment
isn't quite accurate; it's not added, but it's a minimum.
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