class_docstr: OCR test problem.
class_docstr_tok: ["OCR","test","problem","."]
code: def train_shards(self):
      return 1
  
file_path: tensor2tensor/tensor2tensor/data_generators/ocr.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import struct
  from tensor2tensor.data_generators import image_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 4 for calling the OcrTest obj's underlying member method code with example usage: obj.train_shards() and returns: int