class_docstr: MSCOCO data set from http://cs.stanford.edu/people/karpathy/cvpr2015.pdf
code: def gen_iterators(self):
      data_path = self.load_data()
      self._data_dict = {
          "train": ImageCaption(
              path=data_path, max_images=self.max_images
          )
      }
      self._data_dict["test"] = ImageCaptionTest(path=data_path)
      return self._data_dict
  
imports: from collections import Counter
  import numpy
  import os
  from neon import logger
  from neon.data.dataiterator import NervanaDataIterator
  from neon.data.datasets import Dataset
  from neon.util.compat import xrange
label_desc: Use image node_id 3 for calling the Coco obj's underlying member method code with example usage: obj.gen_iterators() and returns: self