class_docstr: Simple operator test
code: def setUp(self) -> None:
      img_pil = Image.open(test_image)
      op = PytorchTransformOperator(256)
      self.img_tensor = op(img_pil).img_transformed
      self.model = "resnet50"
  
file_path: towhee/tests/unittests/operators/test_pytorch_image_classification_operator.py
imports: import unittest
  import torchvision
  from pathlib import Path
  from towhee.utils.pil_utils import PILImage
  from tests.unittests.mock_operators import PYTORCH_IMAGE_CLASSIFICATION_OPERATOR_PATH, load_local_operator
  from tests.unittests.mock_operators.pytorch_transform_operator.pytorch_transform_operator import PytorchTransformOperator
label_desc: Use image node_id 1 for calling the TestOperator obj's underlying member method code with example usage: obj.setUp() without return types