code: def __init__(self):
      super().__init__()
      self.model = torchvision.models.resnet18(pretrained=True)
  
imports: import unittest
  import torchvision
  from pathlib import Path
  from shutil import rmtree
  from torch import nn
  from torch.optim import AdamW
  from torchvision import transforms
  from towhee.operator import NNOperator
  from towhee.trainer.training_config import TrainingConfig
  from towhee.data.dataset.image_datasets import PyTorchImageDataset
label_desc: Use image node_id 1 to create a new MockOperator object from inherited base classes: NNOperator with example: obj = MockOperator()