code: def __call__(self, index):
      return (index, self.transform)
  
file_path: pytorch-meta/torchmeta/transforms/categorical.py
imports: import torch
  from torchmeta.transforms.utils import apply_wrapper
  from collections import defaultdict
  from torchmeta.transforms.target_transforms import TargetTransform
label_desc: Use image node_id 2 for calling the FixedCategory obj's underlying member method code with example usage: obj.__call__(index) and returns: index,  self