<s> import Neuron <EOL> import math <EOL> class TanhNeuron ( Neuron . Neuron ) : <EOL> def __init__ ( self ) : <EOL> pass <EOL> def Activate ( self , x ) : <EOL> return math . tanh ( x ) <EOL> def Derivative ( self , x ) : <EOL> coshx = math . cosh ( x ) <EOL> denom = ( math . cosh ( <NUM_LIT:2> * x ) + <NUM_LIT:1> ) <EOL> return <NUM_LIT:4> * coshx * coshx / ( denom * denom ) </s>
