code: def do_test_pack_sequences_length5(self, pack_fn):
      inputs = [
          [1, 2, 3],
          [4, 5, 0],
          [6, 0, 0],
      ]
      targets = [
          [10, 0, 0],
          [20, 30, 40],
          [50, 60, 0],
      ]
      max_length = 5
      (
          inputs_packed,
          inputs_segmentation,
          inputs_position,
          targets_packed,
          targets_segmentation,
          targets_position,
      ) = pack_fn(inputs, targets, max_length, max_length)
      self.assertAllEqual(
          inputs_packed,
          [
              [1, 2, 3, 4, 5],
              [6, 0, 0, 0, 0],
          ],
      )
      self.assertAllEqual(
          inputs_segmentation,
          [
              [1, 1, 1, 2, 2],
              [1, 0, 0, 0, 0],
          ],
      )
      self.assertAllEqual(
          inputs_position,
          [
              [0, 1, 2, 0, 1],
              [0, 0, 0, 0, 0],
          ],
      )
      self.assertAllEqual(
          targets_packed,
          [
              [10, 20, 30, 40, 0],
              [50, 60, 0, 0, 0],
          ],
      )
      self.assertAllEqual(
          targets_segmentation,
          [
              [1, 2, 2, 2, 0],
              [1, 1, 0, 0, 0],
          ],
      )
      self.assertAllEqual(
          targets_position,
          [
              [0, 0, 1, 2, 0],
              [0, 1, 0, 0, 0],
          ],
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  from tensor2tensor.data_generators.ops import pack_sequences_ops
  import tensorflow.compat.v1
label_desc: Use image node_id 3 for calling the PackSequencesOpsTest obj's underlying member method code with example usage: obj.do_test_pack_sequences_length5(pack_fn) without return types