Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16344#discussion_r93420832
--- 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
}
private[regression] object Family {
/**
* Gets the [[Family]] object from its name.
+ * This does not work for the tweedie family as it depends on the
variance power
+ * that is set by the user.
*
- * @param name family name: "gaussian", "binomial", "poisson" or
"gamma".
+ * @param name family name: "gaussian", "binomial", "poisson" and
"gamma".
--- End diff --
Nite: revert this, because it's really an "or"
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