public class SolrDataSetIterator
A DataSetIterator which uses a Solr to search for data that is used
as a training dataset
This class will run a search against a solr instance (in myrobotlab) and
provide a dataset iterator on the results. It's expected that the solr index
has a field called "label" that contains the label for the document in
addition, it is also expected that the documents have a field called "bytes"
that contains a binary image.