code: def test_ivf_hnsw(self):
      d = self.xq.shape[1] * 8
  
      quantizer = faiss.IndexBinaryHNSW(d)
      index = faiss.IndexBinaryIVF(quantizer, d, 8)
      index.cp.min_points_per_centroid = 5  # quiet warning
      index.nprobe = 4
      index.train(self.xt)
      index.add(self.xb)
      D, I = index.search(self.xq, 3)
  
      fd, tmpnam = tempfile.mkstemp()
      os.close(fd)
      try:
          faiss.write_index_binary(index, tmpnam)
  
          index2 = faiss.read_index_binary(tmpnam)
  
          D2, I2 = index2.search(self.xq, 3)
  
          assert (I2 == I).all()
          assert (D2 == D).all()
  
      finally:
          os.remove(tmpnam)
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import numpy
  import unittest
  import faiss
  import os
  import tempfile
label_desc: Use image node_id 3 for calling the TestBinaryHNSW obj's underlying member method code with example usage: obj.test_ivf_hnsw() without return types