class_docstr: Yelp dataset, character level.
code: def global_task_id(self):
      return problem.TaskID.EN_CHR_SENT
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tarfile
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 2 for calling the SentimentYelpPolarityCharacters obj's underlying member method code with example usage: obj.global_task_id() and returns: problem