code: def test_knn_and_range_Flat(self):
      self.do_test_knn_and_range("IVF32,Flat")
  
imports: import numpy
  import faiss
  import unittest
  import sys
  import gc
  from faiss.contrib import datasets
  from faiss.contrib.evaluation import sort_range_res_2, check_ref_range_results
label_desc: Use image node_id 2 for calling the TestPrecomputed obj's underlying member method code with example usage: obj.test_knn_and_range_Flat() without return types