def _Psi_lineFITC(self,s,dalpha,alpha,V,d0,m,likfunc,y,inffunc):
        '''
        Criterion Psi at alpha + s*dalpha for line search
        '''
        alpha = alpha + s*dalpha
        f = self._mvmK(alpha,V,d0) + m
        vargout = likfunc.evaluate(y,f,None,inffunc,None,3)
        lp = vargout[0]; dlp = vargout[1]; d2lp = vargout[2]
        W = -d2lp
        Psi = lp.sum() - old_div(np.dot(alpha.T,(f-m)),2.)
        return Psi[0],alpha,f,dlp,W
dataset/ETHPy150Open marionmari/pyGPs/pyGPs/Core/inf.py/Inference._Psi_lineFITC/swapped operands of `-`