code: def setUp(self):
      space_type = "normleven"
      space_param = []
      method_name = "small_world_rand"
      index_name = method_name + ".index"
      if os.path.isfile(index_name):
          os.remove(index_name)
      self.index = nmslib.init(
          space_type,
          space_param,
          method_name,
          nmslib.DataType.OBJECT_AS_STRING,
          nmslib.DistType.FLOAT,
      )
  
imports: import unittest
  import numpy.testing
  import os
  import numpy
  import nmslib
label_desc: Use image node_id 1 for calling the StringTests2 obj's underlying member method code with example usage: obj.setUp() without return types