code: def normalize_word(word):
      return to_unicode(word).lower()
  
file_path: sumy/sumy/summarizers/_summarizer.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  from collections import namedtuple
  from operator import attrgetter
  from ..utils import ItemsCount
  from .._compat import to_unicode
  from ..nlp.stemmers import null_stemmer
label_desc: Use image node_id 4 for calling the AbstractSummarizer obj's underlying member method code with example usage: obj.normalize_word(word) and returns: to_unicode