code: def test_freeze_module_with_interface_and_fork(self):
      class SubModule(torch.nn.Module):
          def __init__(self):
              super().__init__()
              self.b = torch.tensor([1.5])
  
          def forward(self, x):
              self.b[0] += 3.2
              return self.b
  
      class OrigMod(torch.nn.Module):
          def __init__(self):
              super().__init__()
              self.a = torch.tensor([0.5])
  
          def forward(self, x):
              return self.a
  
      @torch.jit.interface
      class ModInterface(torch.nn.Module):
          def forward(self, x: Tensor) -> Tensor:
              pass
  
      class TestModule(torch.nn.Module):
          proxy_mod: ModInterface
  
          def __init__(self):
              super().__init__()
              self.proxy_mod = OrigMod()
              self.sub = SubModule()
  
          def forward(self, x):
              y = self.proxy_mod(x)
              z = self.sub(x)
              return y + z
  
      class MainModule(torch.nn.Module):
          def __init__(self):
              super().__init__()
              self.test = TestModule()
  
          def forward(self, x):
              fut = torch.jit._fork(self.test.forward, x)
              y = self.test(x)
              z = torch.jit._wait(fut)
              return y + z
  
      m = torch.jit.script(MainModule())
      m.eval()
      mf = torch._C._freeze_module(m._c, freezeInterfaces=True)
  
imports: from typing import List, Any
  import torch
  import torch.nn
  import os
  import sys
  from torch import Tensor
  from torch.testing._internal.jit_utils import JitTestCase, make_global
label_desc: Use image node_id 15 for calling the TestModuleInterface obj's underlying member method code with example usage: obj.test_freeze_module_with_interface_and_fork() and returns: self, self, unknown, unknown