crossValidate  Cross validate prtAction using prtDataSet and cross validation keys.
 
   OUTPUTDATASET = OBJ.crossValidate(DATASET, KEYS) cross-
   validates the prtAction object OBJ using the prtDataSet
   DATASET and the KEYS. DATASET must be a labeled prtDataSet.
   KEYS must be a vector of integers with the same number of
   elements as DATASET has observations.
 
   The KEYS are are used to parition the input DATASET into
   test and training data sets. For each unique key, a test set
   will be created out of the corresponding observations of the
   prtDataSet. The remaining observations will be used as
   training data.
 
   [OUTPUTDATASET, TRAINEDACTIONS] = OBJ.crossValidate(DATASET,
   KEYS) outputs the trained prtAction objects TRAINEDACTIONS.
   TRAINEDACTIONS will have a length equal to the number of
   unique KEYS.

Help for prtClassMap/crossValidate is inherited from superclass prtAction