code: def testFlatStructure(
      self,
      value_fn,
      expected_structure_fn,
      expected_types_fn,
      expected_shapes_fn,
  ):
      value = value_fn()
      expected_structure = expected_structure_fn()
      expected_types = expected_types_fn()
      expected_shapes = expected_shapes_fn()
      s = structure.type_spec_from_value(value)
      self.assertIsInstance(s, expected_structure)
      flat_types = structure.get_flat_tensor_types(s)
      self.assertEqual(expected_types, flat_types)
      flat_shapes = structure.get_flat_tensor_shapes(s)
      self.assertLen(flat_shapes, len(expected_shapes))
      for expected, actual in zip(expected_shapes, flat_shapes):
          if expected is None:
              self.assertEqual(actual.ndims, None)
          else:
              self.assertEqual(actual.as_list(), expected)
  
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 1 for calling the StructureTest obj's underlying member method code with example usage: obj.testFlatStructure(value_fn, expected_structure_fn, expected_types_fn, expected_shapes_fn) without return types