I recently bought a Hayward Shark Vac. I believe one of its advantages is that it lears the shape of your pool, and then becomes more efficienct with coverage. My question is, is this learning cumulative? A cleaning cycle is 2 hours -- does it learn during this 2 hours, and get more efficient, and then start all over the next time? Or, does it retain its learning, and use this as a starting point for its next cycle? So will the cleaner get better with time, or is each cycle the same?