code: def _verify_export(self, fused, fused_x):
      # check that export() is working
      onnx_str = torch.onnx.export_to_pretty_string(
          fused,
          (fused_x,),
          input_names=["x_in"],
          opset_version=18,
      )
      assert "x_in" in onnx_str
      assert (
          "ReduceMean" in onnx_str or "LayerNormalization" in onnx_str
      )
  
imports: import torch
  from apex.normalization import FusedLayerNorm
  from apex.normalization import FusedRMSNorm
  from apex.normalization import MixedFusedLayerNorm
  from apex.normalization import MixedFusedRMSNorm
  from torch.testing._internal import common_utils
  from torch.testing._internal.common_device_type import instantiate_device_type_tests
  from itertools import product
label_desc: Use image node_id 15 for calling the TestFusedLayerNorm obj's underlying member method code with example usage: obj._verify_export(fused, fused_x) without return types