code: def __call__(self, document, sentences_count):
      words = self._get_significant_words(document.words)
      return self._get_best_sentences(
          document.sentences, sentences_count, self.rate_sentence, words
      )
  
file_path: sumy/sumy/summarizers/luhn.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  from ..models import TfDocumentModel
  from ._summarizer import AbstractSummarizer
label_desc: Use image node_id 3 for calling the LuhnSummarizer obj's underlying member method code with example usage: obj.__call__(document, sentences_count) and returns: self