Github user dbtsai commented on a diff in the pull request: https://github.com/apache/spark/pull/10743#discussion_r49652270 --- 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 -- BTW, this bug should not happen when all the labels are one since the histogram should be still size of two.
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