Function to score examples individually, where each example is associated with a particular key
Note that scoring is batched for computational efficiency.
This is the Spark implementation of t he MultiLayerNetwork.scoreExamples(DataSet, boolean) method Note: The DataSet objects passed in must have exactly one example in them (otherwise: can't have a 1:1 association
between keys and data sets to score)
public ScoreExamplesWithKeyFunction(org.apache.spark.broadcast.Broadcast<INDArray> params,