Github user feynmanliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/10743#discussion_r49946338
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/classification/LogisticRegressionSuite.scala
---
@@ -883,6 +884,22 @@ class LogisticRegressionSuite
assert(model1a0.intercept ~== model1b.intercept absTol 1E-3)
}
+ test("logistic regression with all labels the same") {
+ val lr = new LogisticRegression()
+ .setFitIntercept(true)
+ .setMaxIter(3)
+ val sameLabels = dataset
+ .withColumn("zeroLabel", lit(0.0))
+ .withColumn("oneLabel", lit(1.0))
+
+ val model = lr
+ .setLabelCol("oneLabel")
+ .fit(sameLabels)
+
+ assert(model.coefficients ~== Vectors.dense(0.0) absTol 1E-3)
+ assert(model.intercept === Double.PositiveInfinity)
--- End diff --
Thanks for pointing that out!
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