code: def test_load_save_transformer(self):
      RDF2VecTransformer(
          walkers=[
              RandomWalker(2, None, random_state=42),
              WLWalker(2, 2, random_state=42),
          ]
      ).save()
      transformer = RDF2VecTransformer.load()
      assert len(transformer.walkers) == 2
      assert isinstance(transformer.walkers[0], RandomWalker)
      assert isinstance(transformer.walkers[1], WLWalker)
      os.remove("transformer_data")
  
file_path: pyRDF2Vec/tests/test_rdf2vec.py
imports: import os
  import pickle
  import numpy
  import pytest
  from pyrdf2vec.graphs import KG, Vertex
  from pyrdf2vec.rdf2vec import RDF2VecTransformer
  from pyrdf2vec.walkers import RandomWalker, WLWalker
label_desc: Use image node_id 5 for calling the TestRDF2VecTransformer obj's underlying member method code with example usage: obj.test_load_save_transformer() without return types