>>> qZero * 5 (2><1) [ 5.0 :+ 0.0, 0.0 :+ 0.0 , 0.0 :+ 0.0, 0.0 :+ 0.0 ]
>>> import Control.Arrow (runKleisli) >>> import Control.Monad.Logger (runStdoutLoggingT) >>> import InfBackprop (call)
>>> runStdoutLoggingT $ runKleisli (call (*)) (6, 7) [Info] Calculating multiplication of 6 and 7 => 42 42