code: def test_subgraph_rewriter_with_unused_args(self):
      class M(torch.nn.Module):
          def forward(self, x, y, z):
              return x + y
  
      def pattern(x, y):
          return x + y
  
      def replacement(x, y):
          return x - y
  
      def comparison(x1, x2, x3):
          return x1 - x2
  
      traced = symbolic_trace(M())
      comparison_fn = symbolic_trace(comparison)
  
      x1 = torch.randn(3, 4)
      x2 = torch.randn(3, 4)
      x3 = torch.randn(3, 4)
  
      subgraph_rewriter.replace_pattern(traced, pattern, replacement)
  
      traced.graph.lint()
      placeholder_nodes = [
          n for n in traced.graph.nodes if n.op == "placeholder"
      ]
      assert len(placeholder_nodes) == 3
  
      ref_outs = comparison_fn(x1, x2, x3)
      test_outs = traced.forward(x1, x2, x3)
      self.assertEqual(ref_outs, test_outs)
  
imports: import os
  import sys
  import torch
  from torch.fx import symbolic_trace, subgraph_rewriter
  from torch.fx.annotate import annotate
  from torch.fx.experimental.rewriter import RewritingTracer
  from torch.testing._internal.jit_utils import JitTestCase
label_desc: Use image node_id 19 for calling the TestSubgraphRewriter obj's underlying member method code with example usage: obj.test_subgraph_rewriter_with_unused_args() and returns: unknown, unknown, unknown, unknown