code: def ir_to_string(ir_fn, index, rindex=None) -> str:
      from .ir import FlexibleLayout
  
      args = [index, rindex] if rindex is not None else [index]
      names = ["index", "rindex"] if rindex is not None else ["index"]
      formatter = KernelFormatterHandler(MockHandler())
  
      with formatter.output.indent(-1):
          formatter.output.writeline(
              f"def inner_fn({', '.join(names)}):"
          )
      for name, arg in zip(names, args):
          if arg:
              lhs = ", ".join(
                  [
                      str(
                          "_"
                          if isinstance(v, (int, sympy.Integer))
                          else v
                      )
                      for v in arg
                  ]
              )
              formatter.output.writeline(f"{lhs} = {name}")
  
      with V.set_ops_handler(formatter), patch.object(
          FlexibleLayout, "allow_indexing", True
      ):
          result = ir_fn(*args)
          return formatter.getvalue(result)
  
imports: from __future__ import annotations
  import itertools
  from contextlib import contextmanager
  from itertools import chain
  from threading import local
  from typing import Any, Callable, TYPE_CHECKING, Union
  from unittest.mock import patch
  import sympy
  from torch._inductor.utils import IndentedBuffer
  from torch.fx.graph import inplace_methods, magic_methods
  from .utils import reduction_num_outputs, sympy_str, sympy_symbol
label_desc: Use image node_id 2 for calling the KernelFormatterHandler obj's underlying member method code with example usage: obj.ir_to_string(ir_fn, index, rindex) and returns: formatter