code: def key_method(self, document, sentences_count, weight=0.5):
      summarization_method = self._build_key_method_instance()
      return summarization_method(document, sentences_count, weight)
  
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  from collections import defaultdict
  from ..nlp.stemmers import null_stemmer
  from ._summarizer import AbstractSummarizer
  from .edmundson_cue import EdmundsonCueMethod
  from .edmundson_key import EdmundsonKeyMethod
  from .edmundson_title import EdmundsonTitleMethod
  from .edmundson_location import EdmundsonLocationMethod
label_desc: Use image node_id 13 for calling the EdmundsonSummarizer obj's underlying member method code with example usage: obj.key_method(document, sentences_count, weight) and returns: summarization_method