docstr: check that the error is in the same ballpark as LSQ.
code: def test_accuracy1(self):
      """check that the error is in the same ballpark as LSQ."""
      recall1 = self.eval_index_accuracy("PLSQ4x3x5_Nqint8")
      recall2 = self.eval_index_accuracy("LSQ12x5_Nqint8")
      self.assertGreaterEqual(recall1, recall2)
  
imports: import numpy
  import faiss
  import unittest
  from faiss.contrib import datasets
label_desc: Use image node_id 1 for calling the TestIndexProductLocalSearchQuantizer obj's underlying member method code with example usage: obj.test_accuracy1() without return types