code: def group_fn(self, sizes):
      return tuple(
          tuple(map(V.graph.sizevars.simplify, s)) for s in sizes
      )
  
file_path: pytorch/test/inductor/extension_backends/extension_codegen_backend.py
imports: from torch._inductor.codegen import cpp, wrapper
  from torch._inductor.scheduler import BaseScheduling
  from torch._inductor.virtualized import V
label_desc: Use image node_id 4 for calling the ExtensionScheduling obj's underlying member method code with example usage: obj.group_fn(sizes) and returns: tuple