code: def test_activity_with_table_of_table(self):
      back = callBigDlFunc("float", "testActivityWithTableOfTable")
      assert isinstance(back.value, list)
      assert isinstance(back.value[0], list)
      assert isinstance(back.value[0][0], JTensor)
  
file_path: BigDL/python/dllib/test/bigdl/test_pickler.py
imports: from bigdl.dllib.nn.layer import *
  from bigdl.dllib.nn.initialization_method import *
  from bigdl.dllib.nn.criterion import *
  from bigdl.dllib.optim.optimizer import *
  from bigdl.dllib.utils.common import *
  from bigdl.dllib.utils.common import _py2java
  from bigdl.dllib.nn.initialization_method import *
  from bigdl.dllib.feature.dataset import movielens
  import numpy
  import tempfile
  import pytest
  from numpy.testing import assert_allclose, assert_array_equal
  from bigdl.dllib.utils.engine import compare_version
label_desc: Use image node_id 5 for calling the TestPickler obj's underlying member method code with example usage: obj.test_activity_with_table_of_table() without return types