Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/1862#discussion_r16022431
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/classification/LogisticRegression.scala
---
@@ -188,3 +188,98 @@ object LogisticRegressionWithSGD {
train(input, numIterations, 1.0, 1.0)
}
}
+
+/**
+ * Train a classification model for Logistic Regression using
Limited-memory BFGS.
+ * NOTE: Labels used in Logistic Regression should be {0, 1}
+ */
+class LogisticRegressionWithLBFGS private (
+ private var convergenceTol: Double,
+ private var maxNumIterations: Int,
+ private var regParam: Double)
+ extends GeneralizedLinearAlgorithm[LogisticRegressionModel] with
Serializable {
+
+ private val gradient = new LogisticGradient()
+ private val updater = new SimpleUpdater()
+ override val optimizer = new LBFGS(gradient, updater)
+ .setNumCorrections(10)
+ .setConvergenceTol(convergenceTol)
+ .setMaxNumIterations(maxNumIterations)
+ .setRegParam(regParam)
+
+ override protected val validators =
List(DataValidators.binaryLabelValidator)
+
+ /**
+ * Construct a LogisticRegression object with default parameters
+ */
+ def this() = this(1E-4, 100, 0.0)
+
+ override protected def createModel(weights: Vector, intercept: Double) =
{
+ new LogisticRegressionModel(weights, intercept)
+ }
+}
+
+/**
+ * Top-level methods for calling Logistic Regression using Limited-memory
BFGS.
+ * NOTE: Labels used in Logistic Regression should be {0, 1}
+ */
+object LogisticRegressionWithLBFGS {
--- End diff --
I don't mind about this. However, it will cause inconsistent api compared
with LogisticRegressionWithSGD
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
