code: def test_IVFPQ_L2(self):
      self.subtest(faiss.METRIC_L2)
  
imports: from __future__ import absolute_import, division, print_function
  import unittest
  import faiss
  import numpy
  from common_faiss_tests import Randu10k, get_dataset_2, Randu10kUnbalanced
label_desc: Use image node_id 2 for calling the TestPQFlavors obj's underlying member method code with example usage: obj.test_IVFPQ_L2() without return types