class_docstr: PyTorch model operator base
code: def __init__(self, model_name) -> None:
      super().__init__()
      model_func = getattr(torchvision.models, model_name)
      self._model = model_func(pretrained=True)
      self._model.eval()
  
file_path: towhee/tests/unittests/mock_operators/pytorch_cnn_operator/pytorch_cnn_operator.py
imports: from typing import NamedTuple
  import numpy
  import torch
  import torchvision
  from towhee.operator import Operator
label_desc: Use image node_id 1 to create a new PytorchCnnOperator object from inherited base classes: Operator with example: obj = PytorchCnnOperator(model_name)