code: def test_merge_IndexScalarQuantizer(self):
      self.do_flat_codes_test("SQ4")
  
imports: import unittest
  import faiss
  import numpy
  from faiss.contrib.datasets import SyntheticDataset
  from common_faiss_tests import Randu10k
label_desc: Use image node_id 5 for calling the TestMerge2 obj's underlying member method code with example usage: obj.test_merge_IndexScalarQuantizer() without return types