code: def test_sequence_length2(self):
      data = [[1, 2, 0, 0, 0], [1, 2, 3, 0, 0], [1, 2, 6, 1, 0]]
      data = tf.convert_to_tensor(data, dtype=tf.float32)
      length = tl.layers.retrieve_seq_length_op2(data)
      print(length)
  
imports: import os
  import unittest
  import numpy
  import tensorflow
  import tensorlayer
  from tests.utils import CustomTestCase
label_desc: Use image node_id 25 for calling the Layer_RNN_Test obj's underlying member method code with example usage: obj.test_sequence_length2() without return types