class_docstr: Test vis
code: def tearDown(self) -> None:
      self.img_path.unlink()
      self.class1_path.rmdir()
      Path(self.root_dir).rmdir()
  
imports: import unittest
  import torch
  from pathlib import Path
  from torchvision import transforms
  from torchvision.models import resnet18
  from towhee.utils.pil_utils import PILImage
  from towhee.utils.matplotlib_utils import matplotlib
  from towhee.trainer.utils.plot_utils import image_folder_sample_show, image_folder_statistic, show_transform, plot_lrs_for_config, plot_lrs_for_scheduler, interpret_image_classification
  from towhee.trainer.training_config import TrainingConfig
  from torch import nn
  from torch.optim.lr_scheduler import StepLR
label_desc: Use image node_id 5 for calling the TestVisualizationUtil obj's underlying member method code with example usage: obj.tearDown() without return types