code: def get_statistics(self):
      raise NotImplementedError(
          "The derived helper needs to implement it."
      )
  
file_path: contextual-ai/xai/data/validator/abstract_validator.py
imports: from typing import Iterator, Dict
  from abc import ABC, abstractmethod
label_desc: Use image node_id 4 for calling the AbstractValidator obj's underlying member method code with example usage: obj.get_statistics() without return types