code: def test_to(self):
      class ToCPU(torch.nn.Module):
          def __init__(self):
              super().__init__()
              self.prelu = torch.nn.PReLU()
  
          def forward(self, x):
              y = x.to("cpu")
              # add prelu since input operand can't be output
              return self.prelu(y)
  
      arg = torch.randn(1, 2, 3, 3)
      self.check(ToCPU(), arg)
      # Test flexible size
      self.check(
          ToCPU(),
          arg,
          convert_args=[torch.zeros(1, 2, 0, 0)],
      )
  
imports: import os
  import ctypes
  import torch
  import unittest
  from typing import Tuple
  from torch.backends._nnapi.prepare import convert_model_to_nnapi
  from torch.testing._internal.common_quantized import supported_qengines
  from torch.testing._internal.common_utils import TestCase, run_tests
label_desc: Use image node_id 19 for calling the TestNNAPI obj's underlying member method code with example usage: obj.test_to() and returns: self