question: public double evaluate ( VectorInstance x , VectorInstance y ) throws Exception { double dotProd = x . dotProduct ( y ) ; double z = m_gamma * dotProd + m_coef0 ; double a = Math . exp ( z ) ; double b = Math . exp ( - z ) ; return ( ( a - b ) / ( a + b ) ) ; }
target:  Compute the result of the kernel evaluation on the supplied vectors