code: def column_mapping(self) -> Dict[str, str]:
      return {self.text_column: "text", self.summary_column: "summary"}
  
imports: from dataclasses import dataclass, field
  from typing import ClassVar, Dict
  from ..features import Features, Value
  from .base import TaskTemplate
label_desc: Use image node_id 1 for calling the Summarization obj's underlying member method code with example usage: obj.column_mapping() and returns: dict