class_docstr: Test problem.
class_docstr_tok: ["Test","problem","."]
code: def __init__(self, input_vocab_size, target_vocab_size):
      super(TestProblem, self).__init__(False, False)
      self.input_vocab_size = input_vocab_size
      self.target_vocab_size = target_vocab_size
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 1 to create a new TestProblem object from inherited base classes: problem with example: obj = TestProblem(input_vocab_size, target_vocab_size)