code: def test_no_grad_simple(self):
      def f(a):
          b = a.sin()
          with torch.no_grad():
              c = b.cos()
          return b * c.sin()
  
      f_compiled = torch.compile(f, backend="pre_dispatch_eager")
  
      a_ref = torch.randn(4, requires_grad=True)
      a_test = a_ref.clone().detach().requires_grad_(True)
  
      out_ref = f(a_ref)
      out_test = f_compiled(a_test)
      self.assertEqual(out_ref, out_test)
  
      out_ref.sum().backward()
      out_test.sum().backward()
      self.assertEqual(a_ref.grad, a_test.grad)
  
imports: import torch
  import torch._dynamo
  import torch._dynamo.test_case
label_desc: Use image node_id 1 for calling the PreDispatchTests obj's underlying member method code with example usage: obj.test_no_grad_simple() and returns: unknown