class_docstr: A test for SAM.
code: def setUp(self):
      self.model = torchvision.models.resnet50(pretrained=True)
      self.base_optimizer = torch.optim.SGD
  
imports: import unittest
  import torch
  import torchvision
  from towhee.models.layers.sam import SAM
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