code: def __call__(self, word):
      return self._stemmer(word)
  
file_path: sumy/sumy/nlp/stemmers/__init__.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  import nltk.stem.snowball
  from .czech import stem_word
  from .ukrainian import stem_word
  from .greek import stem_word
  from ..._compat import to_unicode
  from ...utils import normalize_language
label_desc: Use image node_id 2 for calling the Stemmer obj's underlying member method code with example usage: obj.__call__(word) and returns: self