code: def test_func_load_defaults_as_tuple(self):
      # Using tuple as a default argument
      def dummy_function(x=(1, 2, 3)):
          pass
  
      serialized = python_utils.func_dump(dummy_function)
      deserialized = python_utils.func_load(serialized)
      # Ensure that the defaults are still a tuple
      self.assertIsInstance(deserialized.__defaults__[0], tuple)
      # Ensure that the tuple default remains unchanged
      self.assertEqual(deserialized.__defaults__[0], (1, 2, 3))
  
file_path: keras/keras/utils/python_utils_test.py
imports: import base64
  import marshal
  from keras import testing
  from keras.utils import python_utils
label_desc: Use image node_id 4 for calling the PythonUtilsTest obj's underlying member method code with example usage: obj.test_func_load_defaults_as_tuple() without return types