code: def make_add_sub_mul_pattern():
      r"""Create a pattern to match the following graph.
  
      add  sub
       \   /
        \ /
        mul
      """
      x = wildcard()
      y = wildcard()
      return (x + y) * (x - y)
  
imports: import pytest
  import tvm
  from tvm import relay, tir
  from tvm.relay.dataflow_pattern import TuplePattern, TupleGetItemPattern, is_op, wildcard
  from tvm.relay.testing import run_opt_pass
label_desc: Use image node_id 1 for calling a global function with example usage: make_add_sub_mul_pattern() and returns: unknown