class_docstr: comparative accuracy of a few types of indexes 
class_docstr_tok: ["comparative","accuracy","of","a","few","types","of","indexes"]
code: def test_SQ3(self):
      self.compare_accuracy("SQ8", "SQfp16")
  
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 4 for calling the TestAccuracy obj's underlying member method code with example usage: obj.test_SQ3() without return types