class_docstr: Dataset scheduling for multiple problems.
class_docstr_tok: ["Dataset","scheduling","for","multiple","problems","."]
docstr: Preprocesses examples from different problems before mixing.
docstr_tok: ["Preprocesses","examples","from","different","problems","before","mixing","."]
code: def normalize_example(self, example, hparams):
      """Preprocesses examples from different problems before mixing."""
      del hparams  # Unused.
      return example
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import functools
  import os
  import numpy
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_problems
  import tensorflow.compat.v1
label_desc: Use image node_id 5 for calling the MultiProblemV2 obj's underlying member method code with example usage: obj.normalize_example(example, hparams) and returns: example