code: def test_loop_simple(self):
      def test_fn(x, y, z: int):
          for _ in range(z):
              y = x
          return y
  
      self.assert_device_equal(
          test_fn, [self.cpu, self.cpu, None], self.cpu
      )
      self.assert_device_equal(
          test_fn, [self.cpu, self.cuda, None], None
      )
      self.assert_device_equal(test_fn, [self.cpu, None, None], None)
  
imports: from itertools import product
  import unittest
  import torch
  from torch.testing._internal.common_utils import TEST_CUDA
  from torch.testing._internal.jit_utils import JitTestCase
  from torch.jit._passes._property_propagation import apply_input_props_using_example
label_desc: Use image node_id 17 for calling the TestDeviceAnalysis obj's underlying member method code with example usage: obj.test_loop_simple() and returns: y