code: def test_IndexFlatL2(self):
      q = faiss.IndexFlatL2(d)
      res = ev.launch("FLAT / L2", q)
      e = ev.evalres(res)
      assert e[1] == 1.0
  
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 IndexAccuracy obj's underlying member method code with example usage: obj.test_IndexFlatL2() without return types