docstr: Tests that a placeholder in the graph is not DCE'd, as that would change
  the function signature. Also verifies that a dead node that uses the
  placeholder is DCE'd.
docstr_tok: ["Tests","that","a","placeholder","in","the","graph","is","not","DCE","'d",",","as","that","would","change","the","function","signature",".","Also","verifies","that","a","dead","node","that","uses","the","placeholder","is","DCE","'d","."]
code: def test_dead_placeholder_with_user(self):
      """
      Tests that a placeholder in the graph is not DCE'd, as that would change
      the function signature. Also verifies that a dead node that uses the
      placeholder is DCE'd.
  
      """
  
      class TestModule(torch.nn.Module):
          def forward(self, x, y):
              a = y + 2
              return x + 7
  
      self._run_dce_and_test(TestModule(), expect_dce_changes=True)
  
file_path: pytorch/test/fx/test_dce_pass.py
imports: from typing import Set, Type
  import torch
  import torch.fx
  from torch.testing._internal.common_utils import TestCase
label_desc: Use image node_id 8 for calling the TestDCE obj's underlying member method code with example usage: obj.test_dead_placeholder_with_user() and returns: unknown