code: def __call__(self, reference: T, perturbed: T) -> T:
      ...
  
file_path: foolbox/foolbox/distances.py
imports: from abc import ABC, abstractmethod
  from typing import TypeVar
  import eagerpy
  from .devutils import flatten
  from .devutils import atleast_kd
label_desc: Use image node_id 1 for calling the Distance obj's underlying member method code with example usage: obj.__call__(reference, perturbed) without return types