code: def _vit(self):
      return torchvision.models.vision_transformer.vit_b_32(
          progress=False
      )
  
imports: import unittest
  import torch
  import torchvision
  from lightly import _torchvision_vit_available
  from lightly.models import utils
label_desc: Use image node_id 1 for calling the TestMAEBackbone obj's underlying member method code with example usage: obj._vit() and returns: torchvision