code: def testMultipleInterpreters(self):
      delegate = interpreter_wrapper.load_delegate(self._delegate_file)
      lib = delegate._library
  
      self.assertEqual(lib.get_num_delegates_created(), 1)
      self.assertEqual(lib.get_num_delegates_destroyed(), 0)
      self.assertEqual(lib.get_num_delegates_invoked(), 0)
  
      interpreter_a = interpreter_wrapper.Interpreter(
          model_path=self._model_file, experimental_delegates=[delegate]
      )
  
      self.assertEqual(lib.get_num_delegates_created(), 1)
      self.assertEqual(lib.get_num_delegates_destroyed(), 0)
      self.assertEqual(lib.get_num_delegates_invoked(), 1)
  
      interpreter_b = interpreter_wrapper.Interpreter(
          model_path=self._model_file, experimental_delegates=[delegate]
      )
  
      self.assertEqual(lib.get_num_delegates_created(), 1)
      self.assertEqual(lib.get_num_delegates_destroyed(), 0)
      self.assertEqual(lib.get_num_delegates_invoked(), 2)
  
      del delegate
      del interpreter_a
  
      self.assertEqual(lib.get_num_delegates_created(), 1)
      self.assertEqual(lib.get_num_delegates_destroyed(), 0)
      self.assertEqual(lib.get_num_delegates_invoked(), 2)
  
      del interpreter_b
  
      self.assertEqual(lib.get_num_delegates_created(), 1)
      self.assertEqual(lib.get_num_delegates_destroyed(), 1)
      self.assertEqual(lib.get_num_delegates_invoked(), 2)
  
imports: import ctypes
  import io
  import sys
  from unittest import mock
  import numpy
  import tensorflow
  from tensorflow.lite.python import interpreter
  from tensorflow.lite.python.metrics import metrics
  from tensorflow.lite.python.testdata import _pywrap_test_registerer
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import resource_loader
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the InterpreterDelegateTest obj's underlying member method code with example usage: obj.testMultipleInterpreters() without return types