code: def pointer_bottom(x, model_hparams, vocab_size):
      """Like identity_bottom() without converting to float."""
      del model_hparams, vocab_size  # unused arg
      return x
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 2 for calling a global function with example usage: pointer_bottom(x, model_hparams, vocab_size) and returns: x