code: def test_pack_sequences_k(self):
      self.do_test_pack_sequences_length3(_pack_sequences_k)
      self.do_test_pack_sequences_length4(_pack_sequences_k)
      self.do_test_pack_sequences_length5(_pack_sequences_k)
      self.do_test_pack_sequences_length6(_pack_sequences_k)
      self.do_test_pack_sequences_length7(_pack_sequences_k)
      self.do_test_pack_sequences_length_different_lengths(
          _pack_sequences_k
      )
  
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 8 for calling the PackSequencesOpsTest obj's underlying member method code with example usage: obj.test_pack_sequences_k() without return types