def slstm(c_prev1, c_prev2, x1, x2):
 return SLSTM()(c_prev1, c_prev2, x1, x2)

def slstm ( c_prev1 , c_prev2 , x1 , x2 ) : return SLSTM ( ) ( c_prev1 , c_prev2 , x1 , x2 )
s-lstm units as an activation function .