code: def _get_chunk_rating(self, chunk):
      chunk = self.__remove_trailing_zeros(chunk)
      words_count = len(chunk)
      assert words_count > 0
  
      significant_words = sum(chunk)
      if significant_words == 1:
          return 0
      else:
          return significant_words**2 / words_count
  
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 7 for calling the LuhnSummarizer obj's underlying member method code with example usage: obj._get_chunk_rating(chunk) and returns: int, unknown