code: def test_pickle_fitted(self):
      kproto = kprototypes.KPrototypes(
          n_clusters=4, init="Cao", verbose=2
      )
      model = kproto.fit(STOCKS[:, :2], categorical=1)
      serialized = pickle.dumps(model)
      self.assertTrue(
          isinstance(pickle.loads(serialized), model.__class__)
      )
  
imports: import pickle
  import unittest
  import numpy
  import pandas
  from kmodes import kprototypes
  from kmodes.tests.test_kmodes import assert_cluster_splits_equal
  from kmodes.util.dissim import ng_dissim
label_desc: Use image node_id 2 for calling the TestKProtoTypes obj's underlying member method code with example usage: obj.test_pickle_fitted() without return types