Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/17715#discussion_r113652694
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/classification/LogisticRegressionSuite.scala
---
@@ -1149,6 +1300,49 @@ class LogisticRegressionSuite
assert(model2.interceptVector.toArray.sum ~== 0.0 absTol eps)
}
+ test("multinomial logistic regression with intercept without
regularization with bound") {
+ val lowerBoundOfCoefficients = Matrices.dense(3, 4,
Array.fill(12)(1.0))
+ val lowerBoundOfIntercept = Vectors.dense(Array.fill(3)(1.0))
+
+ val trainer1 = new LogisticRegression()
+ .setLowerBoundOfCoefficients(lowerBoundOfCoefficients)
+ .setLowerBoundOfIntercept(lowerBoundOfIntercept)
+ .setFitIntercept(true)
+ .setStandardization(true)
+ .setWeightCol("weight")
+ val trainer2 = new LogisticRegression()
+ .setLowerBoundOfCoefficients(lowerBoundOfCoefficients)
+ .setLowerBoundOfIntercept(lowerBoundOfIntercept)
+ .setFitIntercept(true)
+ .setStandardization(false)
+ .setWeightCol("weight")
+
+ val model1 = trainer1.fit(multinomialDataset)
+ val model2 = trainer2.fit(multinomialDataset)
+
+ // The solution is generated by
https://github.com/yanboliang/bound-optimization.
+ val coefficientsExpected = new DenseMatrix(3, 4, Array(
+ 2.52076464, 2.73596057, 1.87984904, 2.73264492,
+ 1.93302281, 3.71363303, 1.50681746, 1.93398782,
+ 2.37839917, 1.93601818, 1.81924758, 2.45191255), isTransposed = true)
--- End diff --
We can't hit the lower bound condition even I make the lower bounds as 2.0,
or even 5.0 for this dataset. But I added a test have both lower and upper
bounds ([1.0, 2.0]), the solution hit both bounds.
```val coefficientsExpected3 = new DenseMatrix(3, 4, Array(
1.61967097, 1.16027835, 1.45131448, 1.97390431,
1.30529317, 2.0, 1.12985473, 1.26652854,
1.61647195, 1.0, 1.40642959, 1.72985589), isTransposed = true)
val interceptsExpected3 = Vectors.dense(1.0, 2.0, 2.0)
```
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