class_docstr: holds matrix, ground truth and filenames of a sample
class_docstr_tok: ["holds","matrix",",","ground","truth","and","filenames","of","a","sample"]
code: def __init__(self):
      self.gt = ""
      self.mat = None
      self.fn = ""
  
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 1 to create a new Data object  with example: obj = Data()