code: def testNestMapStructure(self):
      k = object_identity._ObjectIdentityWrapper("k")
      v1 = object_identity._ObjectIdentityWrapper("v1")
      v2 = object_identity._ObjectIdentityWrapper("v2")
      struct = nest.map_structure(lambda a, b: (a, b), {k: v1}, {k: v2})
      self.assertEqual(struct, {k: (v1, v2)})
  
file_path: tensorflow/tensorflow/python/util/object_identity_test.py
imports: from tensorflow.python.platform import test
  from tensorflow.python.util import nest
  from tensorflow.python.util import object_identity
label_desc: Use image node_id 3 for calling the ObjectIdentityWrapperTest obj's underlying member method code with example usage: obj.testNestMapStructure() without return types