maybe torch._C._nativer.PyModelRunner not in global import

[WangFengtu1996]

fix bug in pytorch 2.8.0
ModuleNotFoundError: No module named 'torch._C._nativert'; 'torch._C' is not a package

• command

TORCHINDUCTOR_UNIQUE_KERNEL_NAMES=1 TORCHINDUCTOR_BENCHMARK_KERNEL=1 python -u userbenchmark/dynamo/dynamobench/torchbench.py  --backend inductor --float16 --performance --only BERT_pytorch  --training

• about issue [Bug] ModuleNotFoundError: No module named 'torch._C._nativert' with recent PyTorch nightly #2631

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