Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/9229#discussion_r56208130
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/classification/MultilayerPerceptronClassifier.scala
---
@@ -65,7 +66,42 @@ private[ml] trait MultilayerPerceptronParams extends
PredictorParams
/** @group getParam */
final def getBlockSize: Int = $(blockSize)
- setDefault(maxIter -> 100, tol -> 1e-4, layers -> Array(1, 1), blockSize
-> 128)
+ /**
+ * Optimizer setup.
+ * @group expertParam
+ */
+ final val optimizer: Param[String] = new Param[String](this, "optimizer",
+ " Allows setting the optimizer: minibatch gradient descent (GD) or
LBFGS. " +
+ " The latter is recommended one. ",
+ ParamValidators.inArray[String](Array("GD", "LBFGS")))
+
+ /** @group getParam */
+ final def getOptimizer: String = $(optimizer)
+
+ /**
+ * Learning rate.
+ * @group expertParam
+ */
+ final val learningRate: DoubleParam = new DoubleParam(this, "learning
rate",
--- End diff --
* use `stepSize` instead to be consistent with other algorithms under
`spark.ml`
* You can get this from `HasStepSize`
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