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From njoshi <nikhil.jo...@teamaol.com>
Subject Classification model <init> method not found
Date Tue, 22 Dec 2015 21:04:42 GMT
Hi,

I have a custom extended LogisticRegression model which I want to test
against a parameter grid search. I am running as follows:

/
   val exLR = new ExtendedLR()
      .setMaxIter(100)
      .setFitIntercept(true)

    /*
     * Cross Validator parameter grid
     */
    val paramGrid = new ParamGridBuilder()
      .addGrid(exLR.regParam, Array(1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 2e-3,
1e-2, 1e-1, 0.001341682))
      .addGrid(exLR.elasticNetParam, Array(0.95))
      .build()


    /*
     * Perform cross validation over the parameters
     */
    val cv = new CrossValidator()
      .setEstimator(exLR)
      .setEvaluator(new BinaryClassificationEvaluator)
      .setEstimatorParamMaps(paramGrid)
      .setNumFolds(10)

    /*
     * Run the grid search and pick up the best model
     */
    val bestModel = cv.fit(trainingData)
     .bestModel.asInstanceOf[ExtendedLRModel]
/

While run individually  (exLR.fit(trainingData) way)  it works fine, the
crossValidation code produces the following error. 

/
java.lang.NoSuchMethodException:
org.apache.spark.ml.classification.ExtendedLR.<init>(java.lang.String)
        at java.lang.Class.getConstructor0(Class.java:3082)
        at java.lang.Class.getConstructor(Class.java:1825)
        at
org.apache.spark.ml.param.Params$class.defaultCopy(params.scala:529)
        at org.apache.spark.ml.PipelineStage.defaultCopy(Pipeline.scala:37)
        at
org.apache.spark.ml.classification.ExtendedLR.copy(FactorizationMachine.scala:434)
        at
org.apache.spark.ml.classification.ExtendedLR.copy(FactorizationMachine.scala:156)
        at org.apache.spark.ml.Estimator.fit(Estimator.scala:59)
        at
org.apache.spark.ml.Estimator$$anonfun$fit$1.apply(Estimator.scala:78)
        at
org.apache.spark.ml.Estimator$$anonfun$fit$1.apply(Estimator.scala:78)
        at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
        at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
        at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
        at
scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
        at
scala.collection.TraversableLike$class.map(TraversableLike.scala:245)
        at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:186)
        at org.apache.spark.ml.Estimator.fit(Estimator.scala:78)
        at
org.apache.spark.ml.tuning.CrossValidator$$anonfun$fit$1.apply(CrossValidator.scala:89)
        at
org.apache.spark.ml.tuning.CrossValidator$$anonfun$fit$1.apply(CrossValidator.scala:84)
        at
scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
        at
scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
        at
org.apache.spark.ml.tuning.CrossValidator.fit(CrossValidator.scala:84)
        at com.aol.advertising.ml.Driver$.main(Driver.scala:244)
        at com.aol.advertising.ml.Driver.main(Driver.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
/

Is there anything, such as implicits, I need to add someplace?
Note, *ExtendedLR* has exact same inheritance tree. 

Thanks in advance,
Nikhil



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