Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10743#discussion_r49955604
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/classification/LogisticRegressionSuite.scala
---
@@ -883,6 +884,27 @@ class LogisticRegressionSuite
assert(model1a0.intercept ~== model1b.intercept absTol 1E-3)
}
+ test("logistic regression with fitIntercept=true and 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 allZeroModel = lr
+ .setLabelCol("zeroLabel")
+ .fit(sameLabels)
+ assert(allZeroModel.coefficients ~== Vectors.dense(0.0) absTol 1E-3)
+ assert(allZeroModel.intercept === Double.NegativeInfinity)
+
+ val allOneModel = lr
+ .setLabelCol("oneLabel")
+ .fit(sameLabels)
+ assert(allOneModel.coefficients ~== Vectors.dense(0.0) absTol 1E-3)
+ assert(allOneModel.intercept === Double.PositiveInfinity)
+ }
+
--- End diff --
Can you add one test which is all labels the same but `fitIntercept=false`
here to avoid the issue in LiR? Thanks.
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