code: def test_placeholder(self):
      pass
  
file_path: BigDL/python/nano/test/pytorch/tests/vision/test_vision_ipex.py
imports: import pytest
  import os
  from unittest import TestCase
  from bigdl.nano.pytorch.vision.models import vision
  from test.pytorch.utils._train_torch_lightning import train_with_linear_top_layer
  from bigdl.nano.utils.pytorch import TORCH_VERSION_LESS_2_0
  from bigdl.nano.utils.common import _avx2_checker
label_desc: Use image node_id 1 for calling the CaseWithoutAVX2 obj's underlying member method code with example usage: obj.test_placeholder() without return types