docstr: Creates mapping key = word, value = row index
docstr_tok: ["Creates","mapping","key","=","word",",","value","=","row","index"]
code: def _create_dictionary(self, document):
      """Creates mapping key = word, value = row index"""
      words = map(self.normalize_word, document.words)
      unique_words = frozenset(
          self.stem_word(w) for w in words if w not in self._stop_words
      )
  
      return dict((w, i) for i, w in enumerate(unique_words))
  
file_path: sumy/sumy/summarizers/lsa.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  import math
  from warnings import warn
  from ._summarizer import AbstractSummarizer
label_desc: Use image node_id 5 for calling the LsaSummarizer obj's underlying member method code with example usage: obj._create_dictionary(document) and returns: dict