code: def get_visual_aligned_lemmas(mention):
      
      spans = _to_spans(mention)
      for span in spans:
          sentence = span.sentence
          doc = sentence.document
          # cache features for the entire document
          _preprocess_visual_features(doc)
  
          for aligned_lemma in sentence._aligned_lemmas:
              yield aligned_lemma
docs: Return a generator of the lemmas aligned visually with the Mention.
  
      Note that if a candidate is passed in, all of its Mentions will be searched.
  
      :param mention: The Mention to evaluate.
      :rtype: a *generator* of lemmas