code: def test_create_variations_cpu(self):
      for model_name in self.resnet_variants:
          resnet = ResNetGenerator(model_name)
          model = MoCo(get_backbone(resnet))
          self.assertIsNotNone(model)
  
file_path: lightly/tests/models/test_ModelsMoCo.py
imports: import unittest
  import torch
  import torch.nn
  import torchvision
  import lightly
  from lightly.models import MoCo, ResNetGenerator
label_desc: Use image node_id 2 for calling the TestModelsMoCo obj's underlying member method code with example usage: obj.test_create_variations_cpu() without return types