code: def test_factory_2(self):
      index = faiss.index_factory(12, "SQ8")
      assert index.code_size == 12
  
imports: import numpy
  import unittest
  import gc
  import faiss
  from faiss.contrib import factory_tools
  from faiss.contrib import datasets
label_desc: Use image node_id 2 for calling the TestFactory obj's underlying member method code with example usage: obj.test_factory_2() without return types