code: def fill_infer_targets(x):
      x["infer_targets"] = tf.identity(x["targets"])
      return x
  
file_path: tensor2tensor/tensor2tensor/models/video/nfg_test_utils.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tempfile
  import numpy
  from tensor2tensor.data_generators import video_generated
  from tensor2tensor.models.video import next_frame_glow
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 2 for calling a global function with example usage: fill_infer_targets(x) and returns: x