class_docstr: Abstract class for cifar readers
class_docstr_tok: ["Abstract","class","for","cifar","readers"]
docstr: Return url for downloaded data depends on cifar class
docstr_tok: ["Return","url","for","downloaded","data","depends","on","cifar","class"]
code: def data_url(self):
      """Return url for downloaded data depends on cifar class"""
      data_url = (
          "http://www.cs.toronto.edu/"
          "~kriz/cifar-%d-python.tar.gz" % self.n_classes
      )
      return data_url
  
imports: import tempfile
  import os
  import pickle
  import random
  import numpy
  from data_providers.base_provider import ImagesDataSet, DataProvider
  from data_providers.downloader import download_data_url
label_desc: Use image node_id 3 for calling the CifarDataProvider obj's underlying member method code with example usage: obj.data_url() and returns: data_url