code: def summarizer():
      return LuhnSummarizer()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import pytest
  from sumy.summarizers.luhn import LuhnSummarizer
  from ..utils import build_sentence
label_desc: Use image node_id 1 for calling a global function with example usage: summarizer() and returns: LuhnSummarizer