code: def load_wisdom(wisdomfile):
      
      if wisdomfile is None:
          return
  
      try:
          pyfftw.import_wisdom(pickle.load(open(wisdomfile, 'rb')))
      except (IOError, TypeError) as e:
          log.warn("No wisdom present, generating some at %r" % wisdomfile)
          save_wisdom(wisdomfile)
docs: Prime FFTW with knowledge of which FFTs are best on this machine by
      loading 'wisdom' from the file ``wisdomfile``