code: def testNestedNestedStructure(self):
      s = (
          tensor.TensorSpec([], dtypes.int64),
          (
              tensor.TensorSpec([], dtypes.float32),
              tensor.TensorSpec([], dtypes.string),
          ),
      )
  
      int64_t = constant_op.constant(37, dtype=dtypes.int64)
      float32_t = constant_op.constant(42.0)
      string_t = constant_op.constant("Foo")
  
      nested_tensors = (int64_t, (float32_t, string_t))
  
      tensor_list = structure.to_tensor_list(s, nested_tensors)
      for expected, actual in zip(
          [int64_t, float32_t, string_t], tensor_list
      ):
          self.assertIs(expected, actual)
  
      (
          actual_int64_t,
          (actual_float32_t, actual_string_t),
      ) = structure.from_tensor_list(s, tensor_list)
      self.assertIs(int64_t, actual_int64_t)
      self.assertIs(float32_t, actual_float32_t)
      self.assertIs(string_t, actual_string_t)
  
      (
          actual_int64_t,
          (actual_float32_t, actual_string_t),
      ) = structure.from_compatible_tensor_list(s, tensor_list)
      self.assertIs(int64_t, actual_int64_t)
      self.assertIs(float32_t, actual_float32_t)
      self.assertIs(string_t, actual_string_t)
  
imports: import collections
  import dataclasses
  import functools
  from absl.testing import parameterized
  import numpy
  import wrapt
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.util import nest
  from tensorflow.python.data.util import structure
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import tensor_array_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.ops.ragged import ragged_tensor_value
  from tensorflow.python.platform import test
  from tensorflow.python.util.compat import collections_abc
label_desc: Use image node_id 14 for calling the StructureTest obj's underlying member method code with example usage: obj.testNestedNestedStructure() without return types