class_docstr: Test pickler and unpickler using the .hvz format, including
  metadata access.
code: def test_serialize_deserialize_2(self):
      data, _ = Pickler(self.image2)
      obj = Unpickler(data)
      assert_element_equal(obj, self.image2)
  
imports: import numpy
  from holoviews import Image, Layout
  from holoviews.core.io import Deserializer, Pickler, Serializer, Unpickler
  from holoviews.element.comparison import assert_element_equal
label_desc: Use image node_id 9 for calling the TestBasicPickler obj's underlying member method code with example usage: obj.test_serialize_deserialize_2() without return types