class_docstr: comparative accuracy of a few types of indexes 
class_docstr_tok: ["comparative","accuracy","of","a","few","types","of","indexes"]
code: def test_Lattice2(self):
      # here the difference is actually tiny
      # measured errs: [16403.072, 15967.735]
      self.compare_accuracy(
          "ZnLattice3x12_1", "ZnLattice3x12_7", (18000, 16000)
      )
  
imports: from __future__ import print_function
  import numpy
  import unittest
  import faiss
  from common_faiss_tests import get_dataset_2
  from faiss.contrib.datasets import SyntheticDataset
  from faiss.contrib.inspect_tools import get_additive_quantizer_codebooks
label_desc: Use image node_id 9 for calling the TestAccuracy obj's underlying member method code with example usage: obj.test_Lattice2() without return types