Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2231#discussion_r17033162
--- Diff:
mllib/src/test/scala/org/apache/spark/mllib/classification/LogisticRegressionSuite.scala
---
@@ -125,4 +125,39 @@ class LogisticRegressionSuite extends FunSuite with
LocalSparkContext with Shoul
// Test prediction on Array.
validatePrediction(validationData.map(row =>
model.predict(row.features)), validationData)
}
+
+ test("logistic regression with initial weights and non-default
regularizer") {
+ val nPoints = 10000
+ val A = 2.0
+ val B = -1.5
+
+ val testData = LogisticRegressionSuite.generateLogisticInput(A, B,
nPoints, 42)
+
+ val initialB = -1.0
+ val initialWeights = Vectors.dense(initialB)
+
+ val testRDD = sc.parallelize(testData, 2)
+ testRDD.cache()
+
+ // Use half as many iterations as the previous test.
+ val lr = new LogisticRegressionWithSGD().setIntercept(true)
+ lr.optimizer.
+ setStepSize(10.0).
+ setNumIterations(10).
+ setRegParam(1.0)
+
+ val model = lr.run(testRDD, initialWeights)
+
+ val weight0 = model.weights(0)
+ assert(weight0 >= -450000.0 && weight0 <= -40000.0, weight0 + " not in
[-450000.0, -40000.0]")
+ assert(model.intercept >= 350000.0 && model.intercept <= 400000.0,
model.intercept + " not in [350000.0, 400000.0]")
--- End diff --
This line is too wide. We limit line width to 100 in Spark.
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