for tensor_info in signature_def.inputs.values():
      try:
        exported_graph.get_tensor_by_name(tensor_info.name)
      except KeyError as exc:
        try:
          prefixed_name = signature_key + '_' + tensor_info.name
          exported_graph.get_tensor_by_name(prefixed_name)
          tensor_info.name = prefixed_name
        except KeyError:
          raise ValueError(

      input_tensor_name = signature_def.inputs['input_vocabs'].name
      input_tensor = sess.graph.get_tensor_by_name(input_tensor_name)

      lookup_tensor_name = signature_def.outputs['lookup'].name
      lookup_tensor = sess.graph.get_tensor_by_name(lookup_tensor_name)

      lookup_val = sess.run(
          lookup_tensor,
          feed_dict={