code: def __call__(self, img):
      return self.transform(img)
  
file_path: ClassyVision/test/dataset_transforms_test.py
imports: import unittest
  import torch
  import torchvision.transforms
  from classy_vision.dataset.transforms import build_transforms, ClassyTransform, register_transform
  from classy_vision.dataset.transforms.util import ImagenetNoAugmentTransform
label_desc: Use image node_id 2 for calling the center_crop obj's underlying member method code with example usage: obj.__call__(img) and returns: self