class_docstr: LM1b and IMDb mixed problem class for multitask learning.
code: def __init__(self, was_reversed=False, was_copy=False):
      super(LanguagemodelLm1bSentimentIMDB, self).__init__(
          was_reversed, was_copy
      )
      self.task_list.append(lm1b.LanguagemodelLm1bCharacters())
      self.task_list.append(imdb.SentimentIMDBCharacters())
  
file_path: tensor2tensor/tensor2tensor/data_generators/lm1b_imdb.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensor2tensor.data_generators import imdb
  from tensor2tensor.data_generators import lm1b
  from tensor2tensor.data_generators import multi_problem
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.utils import registry
label_desc: Use image node_id 1 to create a new LanguagemodelLm1bSentimentIMDB object from inherited base classes: multi_problem with example: obj = LanguagemodelLm1bSentimentIMDB(was_reversed, was_copy)