code: def test_factory(self):
      index = faiss.index_factory(20, "LSQ5x6_Nqint8")
      self.assertEqual(index.lsq.M, 5)
      self.assertEqual(index.lsq.K, 1 << 6)
      self.assertEqual(
          index.lsq.search_type, faiss.AdditiveQuantizer.ST_norm_qint8
      )
  
      index = faiss.index_factory(20, "LSQ5x6_Ncqint8")
      self.assertEqual(
          index.lsq.search_type, faiss.AdditiveQuantizer.ST_norm_cqint8
      )
  
      index = faiss.index_factory(20, "LSQ5x6_Ncqint4")
      self.assertEqual(
          index.lsq.search_type, faiss.AdditiveQuantizer.ST_norm_cqint4
      )
  
imports: import numpy
  import faiss
  import unittest
  from faiss.contrib import datasets
label_desc: Use image node_id 3 for calling the TestIndexLocalSearchQuantizer obj's underlying member method code with example usage: obj.test_factory() without return types