old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """Contains functions to canonicalize relationships."""
  from __future__ import absolute_import
  from __future__ import print_function
  
  from nltk.corpus import wordnet
  from .utils import wordnet_helper
  from .utils import common
  
  
  def canonicalize_relationship(text):
      words = common.clean_text(text).split()
      freq = []
      for word in words:
          for pos in [wordnet.VERB, wordnet.ADV]:
              freq.extend(wordnet_helper.lemma_counter(word,
                                                       pos=pos).most_common())
      if freq:
          return max(freq, key=lambda x: x[1])[0]
      else:
          return None
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """Contains functions to canonicalize relationships."""
  from __future__ import absolute_import
  from __future__ import print_function
  
  import repoze.lru
  from nltk.corpus import wordnet
  from .utils import wordnet_helper
  from .utils import common
  
  
  @repoze.lru.lru_cache(4096)
  def canonicalize_relationship(text):
      words = common.clean_text(text).split()
      freq = []
      for word in words:
          for pos in [wordnet.VERB, wordnet.ADV]:
              freq.extend(wordnet_helper.lemma_counter(word,
                                                       pos=pos).most_common())
      if freq:
          return max(freq, key=lambda x: x[1])[0]
      else:
          return None
  
subject: Add LRU for relationship mapper.