code: def column_mapping(self) -> Dict[str, str]:
      raise NotImplementedError
  
file_path: datasets/src/datasets/tasks/base.py
imports: import abc
  import copy
  import dataclasses
  from dataclasses import dataclass
  from typing import ClassVar, Dict, Type, TypeVar
  from ..features import Features
label_desc: Use image node_id 3 for calling the TaskTemplate obj's underlying member method code with example usage: obj.column_mapping() without return types