class_docstr: load data from a given directory
class_docstr_tok: ["load","data","from","a","given","directory"]
code: def __iter__(self):
      return self
  
file_path: calamari/calamari_ocr/thirdparty/ctcwordbeamsearch/DataLoader.py
imports: from __future__ import division
  from __future__ import print_function
  import codecs
  import os.path
  import numpy
  from LanguageModel import LanguageModel
label_desc: Use image node_id 4 for calling the DataLoader obj's underlying member method code with example usage: obj.__iter__() and returns: self