feedforward vs get ahead of

feedforward

verb
  • To respond in advance 

noun
  • An anticipatory response to expected changes in the environment of a system 

get ahead of

verb
  • To take preemptive action before the development becomes reality. 

  • Used other than figuratively or idiomatically: see get, ahead, of. 

How often have the words feedforward and get ahead of occurred in a corpus of books? (source: Google Ngram Viewer )